Medical Emergencies

Endocrine System Emergencies

Blood Glucose Emergencies: Hypoglycemia and Hyperglycemia

Anatomy, Physiology, and Disease Process

• Key organs: The pancreas and adrenal glands are important in maintaining normal blood glucose levels.
• Pancreas: Located in the upper abdomen behind the stomach, between the duodenum and spleen.
  • The pancreas performs both endocrine and exocrine functions.
  • Endocrine function: The islets of Langerhans contain several hormone-producing cells, including alpha, beta, and delta cells.
  • Alpha cells: Produce glucagon, a hormone released when blood glucose becomes too low. Glucagon increases blood glucose by stimulating the liver to break stored glycogen into glucose, a process called glycogenolysis. It also encourages the formation of new glucose through gluconeogenesis.
  • Beta cells: Produce insulin. Insulin lowers blood glucose by helping glucose enter body cells where it can be used for energy. It also encourages storage of excess energy as glycogen and fat. In type 1 diabetes, destruction of beta cells results in little or no insulin production, causing blood glucose to rise.
  • Delta cells: Produce somatostatin, which helps regulate the release of insulin and glucagon and slows certain digestive processes.
• Adrenal glands: These glands also contribute to glucose regulation.
  • Glucocorticoids: The adrenal cortex produces cortisol. Cortisol can raise blood glucose by increasing glucose production and decreasing glucose utilization by some tissues.

How Diabetic Emergencies Develop

Type 1 Diabetes and Diabetic Ketoacidosis

• In type 1 diabetes mellitus, the pancreas produces little or no insulin because the insulin-producing beta cells have been damaged or destroyed.
  • It commonly begins earlier in life, although it can develop at any age.
  • Type 1 diabetes is also described as insulin-dependent diabetes mellitus because patients require insulin therapy.
  • Genetic and autoimmune factors contribute to its development.
  • Patients depend on regular insulin administration to maintain proper glucose control.
• Without adequate insulin, glucose cannot effectively enter many body cells and accumulates in the bloodstream.
  • When blood glucose becomes significantly elevated, glucose begins spilling into the urine.
  • Glucose in the urine draws water with it, producing osmotic diuresis and excessive urination.
  • Continued fluid loss can cause significant dehydration.
• Because cells cannot adequately use glucose, the body begins breaking down fat for energy.
  • Fat metabolism produces ketones.
  • Excessive ketone accumulation causes the blood to become acidic, resulting in metabolic acidosis.
  • This condition is called diabetic ketoacidosis (DKA).
• As dehydration and hyperglycemia worsen, the patient may develop:
  • Polyuria: Excessive urination.
  • Polydipsia: Excessive thirst.
  • Polyphagia: Increased hunger.

Hypoglycemia / Insulin Shock

• Hypoglycemia can occur in patients with either type 1 or type 2 diabetes.
  • It may develop when a patient takes too much insulin or another glucose-lowering medication.
  • It may also occur when the patient does not eat enough, skips a meal, or performs more physical activity than expected after taking medication.
  • Blood glucose falls below the level needed to adequately support normal body and brain function.
• The brain depends heavily on glucose for energy.
  • Severe or prolonged hypoglycemia can cause altered mental status, seizures, unconsciousness, permanent neurologic injury, or death if not corrected promptly.

Type 2 Diabetes and Hyperosmolar Hyperglycemic State

• In type 2 diabetes mellitus, the body may continue to produce insulin, but cells do not respond to it normally. This is known as insulin resistance.
  • Insulin production may also gradually decrease as the condition progresses.
  • Type 2 diabetes has historically been called adult-onset diabetes or non-insulin-dependent diabetes mellitus, although it can occur at younger ages as well.
  • Genetics, excess body weight, physical inactivity, and other metabolic factors can contribute to its development.
  • Early management may include nutrition changes, exercise, and weight management.
  • Medications such as metformin may reduce glucose production, while other medications may increase insulin release or improve the body’s response to insulin.
  • Some patients eventually require insulin.

Hyperosmolar Hyperglycemic State (HHS/HHNK)

• Hyperosmolar hyperglycemic state (HHS) is a serious complication most commonly associated with type 2 diabetes.
  • It was previously called hyperosmolar hyperglycemic nonketotic coma (HHNK).
  • Blood glucose becomes extremely elevated over a period of days or weeks.
  • Large amounts of glucose enter the urine and cause severe osmotic diuresis.
  • The resulting water loss can produce profound dehydration, electrolyte disturbances, and altered mental status.
  • Unlike DKA, enough insulin is usually present to greatly limit fat breakdown and significant ketone production.
  • Because of this, severe ketoacidosis is generally absent or much less prominent than in DKA.

Recognition

Hypoglycemia

Common findings may include:

• Diaphoresis and cool, clammy skin.
• Confusion or altered mental status.
• Tachycardia.
• Hunger.
• Pale skin.
• Weakness.
• Irritability or unusual behavior.
• Slurred speech.
• Poor coordination.
• Nausea.
• Seizures.
• Decreased level of consciousness in severe cases.

Diabetic Ketoacidosis (DKA)

DKA usually develops more rapidly than HHS. Signs and symptoms may include:

• Relatively rapid onset, usually over hours to a few days.
• Polydipsia.
• Polyuria.
• Kussmaul respirations, which are deep and rapid respirations associated with metabolic acidosis.
• Dry skin and dry mucous membranes.
• Nausea and vomiting.
• Abdominal pain.
• Fruity or acetone-like breath odor caused by ketones.
• Weakness.
• Confusion or altered mental status.
• Hyperglycemia.
• Ketones in the blood or urine.
• Hypotension from dehydration.
• Tachycardia.

Hyperosmolar Hyperglycemic State (HHS/HHNK)

HHS typically develops gradually over several days or weeks. Findings may include:

• Gradual onset.
• Polyuria.
• Polydipsia.
• Severe dehydration.
• Dry skin and mucous membranes.
• Marked hyperglycemia.
• Tachycardia.
• Hypotension as dehydration worsens.
• Altered mental status.
• Neurologic changes.
• Possible unconsciousness or coma in severe cases.

Emergency Treatment and Patient Management

Hypoglycemia / Insulin Shock

• Maintain a patent airway and support breathing as necessary.
• Perform a primary assessment and obtain vital signs.
• Check the patient’s blood glucose level as soon as practical.
• If the patient uses an insulin pump and local protocol allows, stop or suspend insulin delivery or have the patient or caregiver do so.
• If the patient is awake, able to follow commands, and able to swallow safely, administer oral glucose according to local EMS protocol, commonly about 15 g.
• Reassess the patient’s mental status, vital signs, and blood glucose after treatment.
• Do not give oral glucose to a patient who cannot protect their airway or safely swallow.
• If the patient remains altered, cannot take oral glucose, or fails to improve, request ALS assistance and transport for a higher level of care.

DKA / HHS

• Maintain the airway and assist ventilation when necessary.
• Assess breathing and circulation carefully.
• Obtain vital signs and measure blood glucose.
• Provide oxygen when indicated by the patient’s clinical condition.
• Watch closely for signs of severe dehydration, shock, and altered mental status.
• Do not delay transport attempting to correct the hyperglycemia in the field.
• Request ALS intercept/support when available.
• Transport promptly to an appropriate emergency department for definitive treatment, including fluid replacement, electroly

Endocrine System Disorders and Emergencies

Introduction

The endocrine system is made up of glands that release hormones into the bloodstream. These hormones regulate many important body functions, including metabolism, growth, reproduction, stress responses, fluid balance, and blood glucose control.

Core Concepts

• The primary role of the endocrine system is to produce and release hormones into the bloodstream.
• Hormones are chemical messengers that travel through the blood and bind to specific receptors on target cells.
• Hormones help the body maintain homeostasis by regulating the activity of organs and tissues.
• Hormone production is commonly controlled by feedback mechanisms, which increase or decrease hormone secretion depending on the body’s needs.

Important Terms

• Endocrine system: A collection of glands and tissues that release hormones into the bloodstream.
• Hormone: A chemical messenger that influences the activity of specific cells or organs.
• Hypothalamus: A region of the brain that helps control the endocrine system.
  • It produces regulatory hormones that influence the pituitary gland.
  • It provides an important connection between the nervous system and endocrine system.
• Target cell: A cell that contains receptors for a particular hormone and responds when that hormone binds to it.

Major Endocrine Glands

Adrenal Glands

The adrenal glands are located on top of the kidneys. Each gland contains two major regions:

• Adrenal cortex: The outer portion of the gland.
  • Produces hormones such as cortisol and aldosterone.
• Adrenal medulla: The inner portion.
  • Produces catecholamines such as epinephrine and norepinephrine, which are involved in the body’s fight-or-flight response.

Gonads

The gonads produce reproductive hormones and play an important role in sexual development and reproduction.

• Testes: Produce testosterone and other male reproductive hormones.
• Ovaries: Produce estrogen, progesterone, and other female reproductive hormones.
• These hormones influence growth, sexual development, reproductive function, and reproductive cycles.

Hypothalamus

The hypothalamus links the nervous and endocrine systems.

• It controls many pituitary gland functions.
• It contributes to regulation of:
  • Body temperature.
  • Appetite.
  • Thirst.
  • Autonomic nervous system activity.
  • Emotional and behavioral responses.
  • Hormone secretion.

Pancreas

The pancreas is located in the upper abdomen near the stomach and duodenum.

It functions as both a digestive organ and an endocrine gland.

• Insulin helps decrease blood glucose by allowing glucose to enter cells.
• Glucagon helps raise blood glucose by stimulating the release and production of glucose.
• Together, these hormones help maintain normal blood glucose levels.

Pineal Gland

The pineal gland is a small endocrine gland located within the brain.

• It produces melatonin.
• Melatonin contributes to regulation of the body’s sleep-wake and circadian rhythms.

Pituitary Gland

The pituitary gland is connected to the hypothalamus by a thin stalk.

• It receives regulatory signals from the hypothalamus.
• It contains two major portions:
  • Anterior pituitary: Produces and releases several hormones that regulate other endocrine glands and body functions.
  • Posterior pituitary: Stores and releases hormones produced by the hypothalamus.
• Because it influences several other endocrine glands, the pituitary is often called the master gland, although it is itself largely controlled by the hypothalamus.

Thyroid Gland

The thyroid is a two-lobed gland located in the neck.

• It has a shape often compared to a butterfly or bow tie.
• Thyroid hormones help regulate:
  • Metabolic rate.
  • Energy use.
  • Heat production.
  • Growth and development.

Parathyroid Glands

The parathyroid glands are usually located on the posterior surface of the thyroid.

• Most people have four parathyroid glands.
• They produce parathyroid hormone (PTH).
• PTH plays an important role in maintaining appropriate calcium levels in the blood.

How Hormones Produce Their Effects

The endocrine system sends chemical messages throughout the body. Unlike electrical nerve impulses, which act very rapidly, many hormonal effects develop more gradually.

A hormone travels through the bloodstream until it reaches a target cell with the appropriate receptor. Binding of the hormone to that receptor triggers a specific response.

Steroid Hormones

Steroid hormones are derived primarily from cholesterol.

• They are lipid-soluble.
• Because they can cross the cell membrane, they usually bind to receptors inside the cell.
• The hormone-receptor complex can influence activity within the nucleus and change gene expression.
• Examples include:
  • Cortisol.
  • Estrogen.
  • Testosterone.
  • Aldosterone.

Non-Steroid Hormones

Many non-steroid hormones are made from amino acids or proteins.

• Most are water-soluble and cannot freely cross the cell membrane.
• They usually bind to receptors located on the cell surface.
• Receptor activation can trigger an intracellular signaling pathway, often involving a second messenger.
• Examples include:
  • Insulin.
  • Glucagon.
  • Epinephrine.

Hormone Regulation

Hormone secretion is commonly controlled through feedback systems that adjust hormone levels according to changes within the body.

Negative Feedback

Negative feedback is the most common endocrine feedback mechanism.

When a body condition moves away from its normal range, hormones are released to correct the problem. As the condition returns toward normal, hormone secretion decreases.

For example:

• Blood glucose rises.
• The pancreas releases insulin.
• Insulin promotes glucose uptake and storage.
• As blood glucose returns toward normal, insulin secretion decreases.

Positive Feedback

Positive feedback causes an initial response to stimulate an even stronger response. It is less common and generally continues until a specific event is completed.

A classic example occurs during childbirth:

• Stretching of the cervix stimulates release of oxytocin.
• Oxytocin strengthens uterine contractions.
• Stronger contractions produce additional cervical stretching.
• More oxytocin is released.
• The cycle continues until delivery occurs.

Recognition of Endocrine Disorders

Endocrine disorders may result from excessive hormone production, inadequate hormone production, or failure of target tissues to respond normally to a hormone.

• Hypersecretion: Excessive production and release of a hormone. It may result from gland dysfunction, tumors, or other endocrine abnormalities.
• Hyposecretion: Inadequate production of a hormone, sometimes caused by destruction, failure, or dysfunction of hormone-producing cells.
• Hormone resistance: A condition in which target cells respond poorly or become resistant to a hormone despite its presence.

Adrenal Insufficiency / Addison Disease

Addison disease is a form of primary adrenal insufficiency in which the adrenal cortex does not produce adequate amounts of hormones such as cortisol and often aldosterone.

Patients may experience:

• Severe fatigue.
• Weakness.
• Dehydration.
• Hypotension.
• Electrolyte abnormalities.
• Abdominal symptoms.
• Altered mental status in severe cases.

A severe acute worsening may lead to an adrenal crisis, which is a life-threatening emergency.

Cushing Syndrome

Cushing syndrome results from prolonged exposure to excessive levels of cortisol.

Possible causes include:

• Long-term corticosteroid medication use.
• Excessive cortisol production by the adrenal glands.
• Excessive ACTH production from certain pituitary or other tumors.

Clinical findings may develop gradually and can include abnormal fat distribution, muscle weakness, hypertension, hyperglycemia, and other metabolic abnormalities.

Growth Hormone Disorders

Excessive or inadequate growth hormone can interfere with normal growth and development.

Excess Growth Hormone

• Excessive growth hormone before growth plates close can produce gigantism.
• Excessive growth hormone in adults produces acromegaly.
• Gigantism results in excessive linear growth and unusually tall stature.
• Acromegaly commonly causes enlargement and thickening of bones and soft tissues, especially in the hands, feet, and face.

Growth Hormone Deficiency

Growth hormone deficiency during childhood can result in short stature and impaired growth.

Thyroid Disorders

Thyroid disease may involve either too much or too little thyroid hormone.

Hyperthyroidism

Hyperthyroidism occurs when excessive thyroid hormone is produced.

Possible findings include:

• Weight loss.
• Anxiety or nervousness.
• Heat intolerance.
• Tremors.
• Tachycardia.
• Palpitations.
• Increased metabolism.

Hypothyroidism

Hypothyroidism results from inadequate production of thyroid hormones.

Possible findings include:

• Fatigue.
• Weakness.
• Cold intolerance.
• Weight gain.
• Constipation.
• Dry skin.
• Bradycardia in more severe cases.
• Slowed mental and physical activity.

Diabetes Mellitus

Diabetes mellitus is one of the most common endocrine disorders. It involves impaired regulation of blood glucose and is primarily divided into type 1 and type 2 diabetes.

Type 1 Diabetes

Type 1 diabetes is an autoimmune disorder in which pancreatic beta cells are destroyed.

• The pancreas produces little or no insulin.
• Patients require insulin replacement.
• Without adequate insulin, severe hyperglycemia and diabetic ketoacidosis (DKA) can develop.

Type 2 Diabetes

Type 2 diabetes primarily involves insulin resistance.

• Body cells do not respond effectively to insulin.
• Insulin production may decrease as the condition progresses.
• Severe uncontrolled hyperglycemia can lead to hyperosmolar hyperglycemic state (HHS).

Both types of diabetes can produce significant acute emergencies and long-term complications involving the cardiovascular system, kidneys, nervous system, eyes, and other organs.

Major Endocrine Emergencies

Thyroid Storm

A thyroid storm is a rare but life-threatening complication of severe hyperthyroidism. It occurs when the effects of excessive circulating thyroid hormones become extreme.

The patient may present with:

• Very high fever.
• Severe tachycardia.
• Palpitations.
• Hypertension early in the condition.
• Hypotension or shock as the condition progresses.
• Agitation or anxiety.
• Confusion or delirium.
• Tremors.
• Sweating.
• Nausea, vomiting, or diarrhea.
• Possible seizures or coma in severe cases.

Myxedema Coma

Myxedema coma is a severe and potentially fatal form of hypothyroidism.

• The body’s metabolic processes become profoundly slowed.
• Typical findings may include:
  • Significant bradycardia.
  • Hypotension.
  • Hypothermia.
  • Slow and shallow respirations.
  • Hypoventilation that may progress to respiratory failure.
  • Confusion and extreme lethargy.
  • Decreased level of consciousness.
  • Coma in severe cases.

Because respiratory drive may be significantly depressed, airway and ventilation support are major prehospital priorities.

Diabetic Ketoacidosis (DKA)

DKA develops when there is severe insulin deficiency, preventing the body from effectively using glucose for energy.

• Glucose remains in the bloodstream, resulting in hyperglycemia.
• Because cells cannot adequately use glucose, the body begins breaking down fat for energy.
  • Fat metabolism produces ketone bodies.
  • Accumulation of ketones causes metabolic acidosis.
• DKA occurs most commonly in patients with type 1 diabetes, although it can also occur in some patients with type 2 diabetes.

Classic findings may include:

• Polyuria: Increased urination.
• Polydipsia: Excessive thirst.
• Polyphagia: Increased hunger.
• Dehydration.
• Weakness.
• Nausea and vomiting.
• Abdominal discomfort.
• Altered mental status.
• Kussmaul respirations: Deep, rapid respirations that help compensate for metabolic acidosis.
• Fruity or acetone-like breath odor caused by ketones.
• Tachycardia.
• Hypotension as dehydration becomes severe.

Acute Adrenal Crisis

An acute adrenal crisis occurs when the body suddenly has an inadequate supply of adrenal hormones, particularly cortisol.

It may occur in a patient with adrenal insufficiency, such as Addison disease, especially following:

• Abrupt discontinuation of long-term corticosteroid therapy.
• Severe infection or sepsis.
• Surgery.
• Major trauma.
• Severe physical stress or illness.

Patients may present with:

• Severe hypotension.
• Weakness and profound fatigue.
• Altered mental status.
• Nausea and vomiting.
• Abdominal discomfort.
• Dehydration.
• Hyponatremia, or abnormally low blood sodium.
• Hyperkalemia, or abnormally elevated blood potassium.
• Signs of shock in severe cases.

Treatment and Prehospital Management

Thyroid Storm

EMT treatment is primarily supportive.

• Maintain the airway and assess breathing and circulation.
• Provide oxygen when clinically indicated.
• Assist ventilation if breathing becomes inadequate.
• Begin appropriate cooling measures for significant hyperthermia.
• Avoid aggressive cooling techniques that could cause shivering.
• Monitor the patient’s mental status and vital signs closely.
• Request ALS assistance when appropriate.
• Provide rapid transport for definitive emergency treatment.

Myxedema Coma

Airway and ventilation problems are major concerns.

• Maintain a patent airway.
• Consider an appropriate airway adjunct when indicated.
• Assist ventilations with a bag-mask device when respirations are inadequate.
• Administer oxygen according to the patient’s clinical condition.
• Monitor oxygen saturation when available.
• Monitor waveform capnography when available and within scope.
• Prevent further heat loss and gently protect the patient from cold exposure.
• Support circulation and monitor for hypotension.
• Request ALS support and transport promptly.

Diabetic Ketoacidosis

Prehospital care focuses on recognizing the condition and supporting vital functions.

• Maintain the airway.
• Assess breathing and circulation.
• Assist ventilation when necessary.
• Obtain a blood glucose reading.
• Monitor the patient for dehydration, hypotension, and altered mental status.
• Administer oxygen when indicated.
• Do not attempt to rapidly lower blood glucose with insulin at the EMT level.
• Request ALS assistance when appropriate.
• Transport promptly for definitive treatment with fluids, electrolyte management, and insulin therapy.

Acute Adrenal Crisis

Treatment at the EMT level is mainly supportive.

• Maintain the airway and support breathing.
• Administer oxygen when indicated.
• Monitor for severe hypotension and shock.
• Keep the patient appropriately positioned based on clinical condition.
• Maintain body temperature.
• Request ALS assistance when available.
• Transport rapidly for definitive treatment.

Hypoglycemia

• Check blood glucose whenever possible.
• If the patient is conscious, can follow commands, and can swallow safely, administer oral glucose according to local protocol.
• Do not give anything by mouth to a patient who cannot protect their airway.
• Reassess blood glucose and mental status after treatment.
• Request ALS assistance if the patient remains altered or cannot safely receive oral glucose.

Hyperglycemia

• Maintain the airway and support breathing as needed.
• Check blood glucose.
• Monitor for signs of DKA or HHS, including dehydration and altered mental status.
• Provide supportive care.
• Arrange prompt transport for further evaluation and treatment.

Digestive & Urinary Emergencies

Dialysis and Renal Failure

Introduction

Dialysis is a treatment used when the kidneys can no longer adequately perform their normal functions. In patients with severe or end-stage renal failure, dialysis helps remove metabolic wastes, excess fluid, and abnormal electrolytes while assisting with acid-base and fluid balance.

Hemodialysis is the most common form of dialysis. During treatment, the patient’s blood is circulated through a machine and passed through a specialized filter called a dialyzer.

The dialyzer helps:

• Remove waste products from the blood.
• Remove excess fluid.
• Correct certain electrolyte abnormalities.
• Help maintain proper acid-base balance.

After filtration, the cleaned blood is returned to the patient’s circulation.

Hemodialysis treatments typically last several hours and are performed multiple times each week, depending on the patient’s condition and prescribed treatment schedule.

Patients being transported to a routine dialysis appointment are generally stable. However, missing dialysis treatments can allow fluid, potassium, acids, and metabolic wastes to accumulate, potentially producing a life-threatening emergency.

Dialysis Vascular Access

Before regular hemodialysis can be performed, the patient needs reliable access to the bloodstream. Several types of vascular access may be used.

Arteriovenous Fistula

An arteriovenous (AV) fistula is created surgically by directly connecting an artery to a vein, usually in the arm.

• The increased arterial blood flow causes the vein to become larger and stronger.
• Once sufficiently developed, the fistula can tolerate repeated needle access for dialysis.
• AV fistulas generally have a lower risk of infection and clotting than other long-term dialysis access methods.
• A newly created fistula usually requires time to mature before it can be routinely used.

A functioning AV fistula normally produces:

• A palpable vibration called a thrill.
• A rushing sound heard with a stethoscope called a bruit.

Absence of a normal thrill may indicate that the access has become blocked.

Arteriovenous Graft

An AV graft connects an artery and vein using a synthetic or biologic tube.

• Grafts generally become usable sooner than fistulas.
• They may be used when the patient’s blood vessels are unsuitable for creation of a fistula.
• Compared with fistulas, grafts have a greater risk of infection and clot formation.

Central Venous Dialysis Catheter

Some patients receive dialysis through a catheter placed into a large central vein.

• These catheters may be used when immediate dialysis is needed.
• They may also provide temporary access while a fistula or graft matures.
• Central venous catheters carry a significant risk of infection and should be handled carefully.

Dialysate and Blood Filtration

During hemodialysis, blood passes through the dialyzer while a special fluid called dialysate flows on the opposite side of a semipermeable membrane.

Dialysate contains carefully controlled amounts of:

• Water.
• Electrolytes.
• Other dissolved substances.

Through diffusion and filtration, unwanted wastes, excess electrolytes, and fluid move out of the patient’s blood. The treated blood is then returned to the patient.

Peritoneal dialysis is another method of removing waste and excess fluid from the body.

Instead of passing blood through an external machine, a special dialysis solution is placed into the patient’s abdominal cavity through a catheter.

• The peritoneal membrane acts as the filtering surface.
• Dialysis solution remains in the abdomen for a prescribed period.
• Wastes and excess fluid move from the blood vessels of the peritoneum into the dialysis solution.
• The used solution is then drained and replaced.

Peritoneal dialysis can often be performed at home, providing patients with more independence.

A major complication is peritonitis, an infection of the peritoneal cavity. Findings may include abdominal pain, fever, tenderness, nausea, and cloudy drainage from the dialysis catheter.

Special Considerations for Dialysis Patients

Protect the patient’s dialysis access whenever possible.

• Do not routinely obtain a blood pressure on an arm containing an AV fistula or graft.
• Avoid venipuncture or routine IV placement in the dialysis-access extremity.
• Do not place unnecessary pressure over the access site.
• Do not use the fistula or graft for routine vascular access unless specifically authorized by protocol and appropriately trained.
• Ask the patient which arm contains the dialysis access before applying equipment.

Excessive pressure or trauma can damage the access and interfere with the patient’s ability to receive future dialysis.

Dialysis Complications and Emergencies

Although dialysis is lifesaving, complications may occur during or after treatment.

Common problems include:

• Hypotension, especially when fluid is removed rapidly.
• Bleeding from the fistula, graft, or catheter site.
• Infection of the dialysis access.
• Electrolyte abnormalities.
• Cardiac dysrhythmias.
• Muscle cramps.
• Nausea or vomiting.
• Headache.
• Weakness or fatigue.
• Altered mental status.
• Pulmonary edema.
• Air embolism, although uncommon.
• Dialysis equipment malfunction.

Dialysis Disequilibrium Syndrome

Dialysis disequilibrium syndrome is an uncommon neurologic complication that may occur when metabolic wastes are removed from the blood too rapidly, particularly during initial or aggressive dialysis.

Possible findings include:

• Headache.
• Nausea.
• Restlessness.
• Confusion.
• Altered mental status.
• Muscle twitching.
• Seizures.
• Decreased level of consciousness in severe cases.

Emergencies Associated With Missed Dialysis

Missing one or more dialysis sessions can allow fluid, potassium, hydrogen ions, and metabolic waste products to accumulate.

Potential complications include:

• Hyperkalemia.
• Pulmonary edema.
• Severe hypertension.
• Weakness.
• Shortness of breath.
• Cardiac dysrhythmias.
• Altered mental status.
• Worsening uremia.

Hyperkalemia

Patients with kidney failure are especially vulnerable to elevated potassium levels because their kidneys cannot adequately remove potassium from the body.

Severe hyperkalemia can interfere with normal cardiac conduction and may result in dangerous dysrhythmias or cardiac arrest.

Possible findings include:

• Generalized weakness.
• Fatigue.
• Muscle weakness.
• Bradycardia or other abnormal heart rhythms.
• Palpitations.
• ECG abnormalities.
• Cardiac arrest in severe cases.

For the EMT, recognize the possibility of hyperkalemia in a dialysis patient who has missed treatments and has weakness, bradycardia, dysrhythmias, or other signs of serious illness. Request ALS support when appropriate.

Fluid Overload and Pulmonary Edema

Because the kidneys cannot adequately remove fluid, dialysis patients may develop significant fluid overload between treatments.

Signs may include:

• Shortness of breath.
• Tachypnea.
• Crackles.
• Hypoxia.
• Peripheral edema.
• Hypertension.
• Jugular venous distention.
• Respiratory distress.

Severe fluid overload may cause pulmonary edema and require ventilatory support.

Bleeding From a Dialysis Access

An AV fistula or graft carries blood under relatively high pressure, so bleeding can become severe.

For external bleeding:

• Apply firm direct pressure directly over the bleeding site.
• Use sterile dressings when available.
• Apply a hemostatic dressing if permitted by local protocol and bleeding remains difficult to control.
• Continue monitoring circulation and signs of shock.
• Request ALS assistance when appropriate.
• Transport promptly for uncontrolled or significant hemorrhage.

Avoid unnecessarily compressing the entire access unless required to control life-threatening bleeding.

Management of the Dialysis Emergency

Begin with a standard primary assessment.

Airway and Breathing

• Maintain a patent airway.
• Assess respiratory rate, depth, and effectiveness.
• Administer oxygen when clinically indicated.
• Assist ventilations if breathing is inadequate.
• Consider positive-pressure ventilation or CPAP, when within scope and indicated, for severe pulmonary edema.

Circulation

• Assess pulse, skin signs, and perfusion.
• Monitor for hypotension, hemorrhage, and shock.
• Control external bleeding with direct pressure.
• Avoid blood-pressure cuffs and routine vascular access on an extremity containing a fistula or graft.

Monitoring

When available and appropriate:

• Obtain vital signs.
• Check blood glucose in patients with altered mental status.
• Monitor oxygen saturation.
• Obtain cardiac monitoring through ALS resources when dysrhythmias or electrolyte abnormalities are suspected.
• Ask when the patient’s last dialysis treatment occurred and whether any treatments were missed.

Hypotension Following Dialysis

Some patients develop hypotension because excessive fluid has been removed during dialysis.

• Position the patient appropriately based on respiratory status and perfusion.
• Maintain the airway and provide oxygen when indicated.
• Monitor vital signs frequently.
• ALS providers may administer IV fluids when clinically appropriate and according to protocol.
• Transport patients with persistent hypotension or altered mental status.

Pulmonary Edema

For significant respiratory distress caused by fluid overload:

• Position the patient upright when tolerated.
• Administer oxygen as indicated.
• Consider CPAP when indicated and permitted.
• Assist ventilations if respiratory failure develops.
• Request ALS assistance.
• Transport promptly.

Suspected Electrolyte Emergency

Electrolyte disturbances, particularly hyperkalemia, can produce dangerous cardiac effects.

• Maintain airway, breathing, and circulation.
• Obtain cardiac monitoring when available through ALS.
• Treat life-threatening dysrhythmias according to local EMS protocols.
• ALS treatment of severe hyperkalemia may include medications such as calcium and other therapies based on protocol.
• Do not delay transport for a suspected serious electrolyte disturbance.

Prehospital Priorities

Most dialysis emergencies require supportive EMS care and timely transport rather than definitive correction in the field.

Key priorities are:

• Maintain airway and ventilation.
• Recognize pulmonary edema and respiratory failure.
• Control dialysis-access bleeding.
• Identify signs of shock.
• Consider hyperkalemia in patients who have missed dialysis.
• Protect the patient’s fistula, graft, or catheter.
• Request ALS resources when needed.
• Transport to an appropriate medical facility for definitive evaluation and treatment.

Genitourinary System Disorders

Overview

The genitourinary (GU) system includes the urinary organs responsible for filtering the blood, removing wastes, forming urine, and maintaining important aspects of internal balance. Disorders involving the kidneys and urinary tract are common and may become serious, especially when they interfere with urine flow, fluid balance, electrolytes, or renal function.

Because GU complaints may involve sensitive areas of the body, EMTs should protect the patient’s privacy and dignity while still asking clear, direct questions needed to identify potentially serious problems.

GU emergencies may be caused by either medical illness or trauma, and the exact cause may not always be obvious during the prehospital assessment.

Urinary System Anatomy and Physiology

The urinary system consists primarily of the kidneys, ureters, urinary bladder, and urethra.

In females, the urinary and reproductive systems are anatomically separate, although the structures are located close together. In males, the urinary and reproductive systems share certain structures, particularly the urethra.

Kidneys

The kidneys are paired organs located in the posterior upper abdomen.

• The right kidney lies behind the liver.
• The left kidney lies behind the spleen.
• Blood enters the kidneys through the renal arteries and leaves through the renal veins.
• Each kidney contains approximately one million microscopic functional units called nephrons.

A nephron filters the blood and helps determine which substances should be removed and which should be returned to circulation.

Within each nephron:

• Blood flows through increasingly smaller vessels until it reaches the glomerulus.
• The glomerulus is a network of capillaries surrounded by Bowman’s capsule.
• Water and small dissolved substances move into the renal tubules.
• As the filtrate moves through the tubules, useful substances and water may be reabsorbed.
• Remaining waste becomes urine and eventually drains into the ureter.

Ureters

The ureters are narrow muscular tubes that transport urine from each kidney to the urinary bladder.

Urine normally flows from the kidneys through the ureters and collects in the bladder until urination occurs.

Urinary Bladder

The urinary bladder is a hollow muscular organ located in the pelvis.

Its primary purpose is to temporarily store urine until it is expelled from the body.

Urethra

The urethra carries urine from the bladder to the outside of the body.

In males, the urethra also serves a reproductive function by carrying semen during ejaculation.

Prostate Gland

The prostate gland is located below the male urinary bladder and surrounds the beginning of the urethra.

When the prostate enlarges, it may:

• Compress the urethra.
• Reduce urine flow.
• Cause difficulty starting urination.
• Produce urinary retention.
• Eventually create a medical emergency if the obstruction becomes severe.

Major Functions of the Urinary System

The kidneys do much more than simply produce urine. They contribute to several essential processes that maintain homeostasis.

Important functions include:

• Regulation of blood volume.
• Regulation of fluid and electrolyte balance.
• Maintenance of normal acid-base balance.
• Filtration of blood.
• Removal of metabolic wastes and toxins.
• Regulation of arterial blood pressure.
• Contribution to red blood cell production.
• Regulation of certain aspects of glucose handling.

Waste Removal

The kidneys eliminate substances such as:

• Metabolic waste products.
• Urea formed from nitrogen-containing wastes.
• Drug metabolites and other foreign chemicals.
• Excess electrolytes and water.

Blood Pressure Regulation

The kidneys help regulate blood pressure through control of fluid volume and activation of the renin-angiotensin-aldosterone system.

Red Blood Cell Production

The kidneys release erythropoietin, a hormone that stimulates the bone marrow to produce red blood cells.

Glucose Handling

Under normal conditions, filtered glucose is almost completely reabsorbed by the renal tubules.

When blood glucose becomes significantly elevated, the kidneys may be unable to reabsorb all of the filtered glucose, causing glucose to appear in the urine.

Common Urinary System Conditions

GU emergencies may be difficult to distinguish from other causes of abdominal, flank, back, or pelvic pain.

In the prehospital setting, determining the exact diagnosis is often less important than:

• Performing a complete assessment.
• Identifying life-threatening conditions.
• Obtaining a focused history.
• Providing supportive care.
• Transporting when further evaluation is required.

Renal Calculi / Kidney Stones

Renal calculi, commonly called kidney stones, form when minerals and other substances in the urinary tract crystallize and collect into solid deposits.

A stone may remain in the kidney or travel through the ureter toward the bladder.

As a stone moves, it may obstruct urine flow and produce severe pain known as renal colic.

Common Findings

Patients may describe:

• Sudden or severe flank pain.
• Back pain.
• Lower abdominal pain.
• Pain that radiates toward the groin or genital area.
• Pain that occurs in waves or becomes progressively intense.
• Urinary urgency.
• Increased urinary frequency.
• Blood in the urine (hematuria).
• Nausea or vomiting.
• Pale, cool, or clammy skin.

Fever may suggest an accompanying urinary infection, which can become particularly serious when combined with urinary obstruction.

Male Genitourinary Conditions

Benign Prostatic Hyperplasia

Benign prostatic hyperplasia (BPH) is a noncancerous enlargement of the prostate gland that becomes increasingly common with age.

As the prostate enlarges, it may compress the urethra and interfere with bladder emptying.

Possible complaints include:

• Difficulty beginning urination.
• Weak urine stream.
• Frequent urination.
• Feeling that the bladder has not completely emptied.
• Urinary retention.
• Lower abdominal discomfort from a distended bladder.

Complete inability to urinate accompanied by pain or bladder distention requires medical evaluation.

Priapism

Priapism is a prolonged erection that continues without normal sexual stimulation and may become painful.

It is considered a medical emergency when prolonged because trapped blood can damage penile tissue.

Possible causes include:

• Sickle cell disease.
• Certain cancers or blood disorders.
• Prescription medications.
• Recreational drug use.
• Spinal cord or neurologic conditions.
• Trauma in some cases.

The patient should be treated respectfully and transported for medical evaluation.

Age-Related GU Considerations

Normal aging produces several changes that can affect the urinary system.

A healthy young adult kidney contains roughly one million nephrons, but functional renal tissue gradually decreases with age.

Older adults may therefore have less renal reserve and may be more vulnerable to:

• Dehydration.
• Electrolyte imbalance.
• Medication accumulation.
• Acute kidney injury.
• Urinary infections.

Aging can also cause changes in lower urinary tract function.

Common age-related changes may include:

• Reduced bladder capacity.
• Decreased bladder muscle efficiency.
• Reduced urethral sphincter control.
• Less noticeable sensation of bladder fullness.
• Increased nighttime urination (nocturia).
• Increased urinary urgency or incontinence.

Reduced mobility, prolonged bed rest, and sedentary lifestyles may further increase the risk of urinary retention, infection, and other GU problems.

Prehospital Assessment of GU Complaints

When evaluating a patient with a possible genitourinary problem, begin with the standard airway, breathing, and circulation assessment.

A focused history should include:

• Location and character of the pain.
• When symptoms began.
• Whether the pain moves or radiates.
• Urinary frequency or urgency.
• Difficulty or inability to urinate.
• Blood in the urine.
• Fever or chills.
• Nausea or vomiting.
• Previous kidney stones or urinary disorders.
• Kidney disease or dialysis history.
• Current medications.
• Recent trauma.

Maintain the patient’s privacy during questioning and examination.

Blood-Related Emergencies

Blood Disorders and Hematologic Emergencies

Hematology is the branch of medicine concerned with blood and its components. These components include red blood cells (RBCs), white blood cells (WBCs), platelets, and the proteins involved in bleeding and clot formation. Hematology also includes the hematopoietic system, which consists of the tissues and organs responsible for producing the different components of blood.

Hematologic emergencies involve medical conditions that directly affect the blood, aside from severe blood loss or exsanguination. EMS providers do not frequently encounter true hematologic emergencies, and many blood disorders are chronic conditions that develop or persist over long periods. A hematologic disorder is any condition that specifically interferes with the blood or its normal functions.

Prehospital treatment options for many of these disorders may be limited. However, understanding how these conditions affect the body can help EMS providers recognize complications, perform an appropriate assessment, and advocate effectively for patients with known or suspected blood disorders.

Before examining specific hematologic diseases and their causes, it is important to review the basic anatomy and physiology of the blood and hematopoietic system.

1. Blood
   Blood is a specialized connective tissue made up of cells and cell fragments suspended in a liquid called plasma. In an average adult, blood makes up about 8% of total body weight and has a volume of roughly 5–6 liters. Its major functions include delivering oxygen and nutrients to tissues, transporting hormones, carrying carbon dioxide and metabolic waste for elimination, helping regulate body temperature, maintaining acid-base and electrolyte balance, supporting immune defenses, and forming clots when blood vessels are damaged.
2. Plasma
   Plasma is the liquid portion of blood. It is composed primarily of water along with smaller amounts of electrolytes, proteins, glucose, dissolved substances, and clotting factors. Plasma accounts for approximately half of the total blood volume. The remaining portion consists of formed elements, including RBCs, WBCs, and platelets.
3. Organs Involved in Blood Formation
   Several organs participate in producing, storing, and processing blood components, but the major organs include the liver, spleen, and bone marrow. The liver helps produce clotting factors and also filters the blood and processes waste products. It breaks down old RBCs, converts some of their components into bile, and contains vascular spaces capable of holding significant amounts of blood. The spleen filters blood, removes aging RBCs, contributes to the formation and activity of WBCs, and stores approximately one-third of the body’s platelets. Bone marrow is one of the body’s primary sites of blood-cell production. It is especially active in the long bones, pelvis, skull, and vertebrae.
4. Normal Red Blood Cell Production, Function, and Breakdown
   Red blood cells, also called erythrocytes, develop from stem cells. Their production is stimulated by the hormone erythropoietin, which is primarily released by the kidneys when the body requires additional RBCs. Developing RBCs mature over several days before entering the circulation, where they normally survive for about 120 days. Their main role is to transport oxygen to body tissues. Oxygen attaches to iron-containing hemoglobin inside the RBCs, giving oxygenated blood its characteristic red appearance. In tissues, oxygen is exchanged for carbon dioxide according to concentration differences across cell membranes, a process associated with the Bohr effect.
5. Normal White Blood Cell Production and Function
   White blood cells are a major part of the body’s immune defense system. They protect against microorganisms, pathogens, and other foreign substances. Like RBCs, WBCs originate from stem cells. However, there are several different types of WBCs, with each type carrying out a specialized role in protecting the body.
6. Immune Function
   Immunity describes the body’s ability to defend itself against antigens, infectious organisms, and other harmful foreign materials. The immune system includes specialized cells, tissues, and organs that work together to recognize and eliminate threats. Two major forms of immunity include:
   • Cellular immunity: Also called cell-mediated immunity, this involves immune cells such as T lymphocytes and macrophages directly identifying and attacking pathogens or abnormal cells. It represents an active cellular response to a threat.
   • Humoral immunity: This form of immunity relies primarily on antibodies, or immunoglobulins, that recognize specific antigens. Antibody production helps create immunologic memory, allowing the body to identify and respond more efficiently when it encounters the same antigen again.
   Autoimmune disorders occur when the immune system mistakenly identifies the body’s own cells or tissues as harmful and attacks them. Under normal circumstances, the immune system distinguishes between self and foreign material. During an autoimmune reaction, this ability is impaired. Some autoimmune diseases affect one organ, such as certain conditions involving the pancreas, while others can affect several organs and body systems, as may occur with lupus.
7. Blood Groups and Compatibility
   Blood groups are classifications based on antigens present on the surfaces of RBCs. Although RBCs perform the same basic function, different individuals may have different surface antigens. Antibodies are capable of recognizing these antigen patterns and distinguishing the body’s own RBCs from foreign cells. The ABO blood-group system divides blood into four major types: A, B, AB, and O. Knowing a patient’s blood type is especially important during transfusion because incompatible blood can trigger an immune reaction in which the recipient’s antibodies attack the transfused RBCs. Another important surface antigen is the Rh factor. A person whose RBCs contain the Rh antigen is considered Rh-positive, while a person without the antigen is considered Rh-negative.
8. Hemostasis and Blood Clotting
   Hemostasis is the body’s natural process for stopping bleeding. It is a complex sequence that generally involves three closely related stages: vascular spasm, platelet plug formation, and coagulation.
   • Vascular response: When a blood vessel is injured, the vessel constricts reflexively. This vasoconstriction decreases blood flow to the damaged area. Under normal conditions, endothelial cells lining the vessel help prevent inappropriate clot formation. When the endothelium is damaged, the local environment changes and promotes platelet adhesion.
   • Platelet plug formation: Platelets quickly collect at the damaged site and attach to the injured vessel wall. They aggregate with one another to create a temporary platelet plug.
   • Coagulation: If the platelet plug is not sufficient to stop the bleeding, clotting factors activate through a series of reactions known as the clotting cascade. Fibrin strands form and reinforce the platelet plug, producing a stronger clot. As the clot stabilizes, it develops into a firm thrombus that helps seal the damaged vessel.

Common Assessment Findings in Hematologic Conditions

Assessment of a patient with a suspected hematologic disorder generally follows the same principles used for other medical patients. However, providers should remain alert for findings associated with abnormal clotting, bleeding, anemia, or other blood-related complications. Unusual or unexplained bleeding is particularly important.

Level of consciousness should be evaluated in every patient. Individuals with certain hematologic disorders may have an increased risk of intracranial bleeding or thrombotic events. Because of this, changes in mental status or neurologic findings should prompt a careful neurologic and stroke assessment.

Skin findings may provide evidence of abnormal bleeding. Patients with clotting disorders or abnormalities in clotting factors may develop bruising more easily, and their bruises may be larger, more frequent, or longer-lasting than expected.

Visual changes may include blurred vision, reduced vision, tunnel vision, or the appearance of dark or gray spots. These disturbances can occur with some bleeding disorders and should be taken seriously, especially when accompanied by neurologic symptoms.

Gastrointestinal and oral findings may include frequent or severe nosebleeds, bleeding or irritated gums, ulcers, or problems involving the liver. Patients with bleeding disorders may also experience gastrointestinal hemorrhage. Depending on where the bleeding occurs, blood may appear in vomit or stool. Internal GI bleeding can become life-threatening, so patients with suspected gastrointestinal hemorrhage should also be evaluated for underlying bleeding disorders and the use of anticoagulant medications.

Musculoskeletal effects of some chronic bleeding disorders may include stiff joints, persistent skeletal or joint pain, and generalized body stiffness. Repeated bleeding into joints can contribute to long-term discomfort and impaired movement.

Cardiorespiratory findings vary depending on the underlying hematologic condition. Possible manifestations include shortness of breath, tachycardia, chest discomfort, cardiac dysrhythmias, ischemic symptoms, hemoptysis, and complications involving major blood vessels such as an aortic aneurysm.

Genitourinary findings may include hematuria, or blood in the urine. This can indicate bleeding somewhere within the urinary tract and should be assessed in the context of the patient’s overall condition and history.

General Care for Patients with Hematologic Conditions

• Airway, breathing, and circulation remain the primary priorities when caring for any patient, especially one experiencing a hematologic emergency. Because blood is responsible for transporting oxygen throughout the body, any problem affecting circulation, oxygen delivery, or gas exchange may interfere with the patient’s ability to maintain normal physiologic balance. Respiratory problems should be treated with supplemental oxygen and assisted ventilation when indicated. External bleeding should be controlled with direct pressure and appropriate bandaging. Internal hemorrhage is more difficult to manage in the prehospital setting; follow local protocols regarding IV access and administration of isotonic fluids when necessary to support adequate perfusion and blood pressure.
• Medication-based treatment is generally limited in the EMS environment because management often depends on laboratory findings, the specific blood disorder involved, and the patient’s presenting complaint. However, some associated symptoms may be treated pharmacologically within the provider’s scope of practice, such as administering analgesics for pain or antiemetics for nausea and vomiting.
• Non-medication interventions commonly focus on supportive care, patient comfort, close monitoring, and obtaining a thorough assessment. A complete evaluation is also important for providing an accurate and useful handoff report to receiving healthcare personnel. Although many hematologic conditions are chronic and require definitive management at a higher level of care, EMS providers still play an important role in stabilizing the patient and identifying potentially serious complications.

Sickle cell disease is an inherited blood disorder that receives particular attention in hematologic emergencies because it is one of the most common inherited blood disorders in the United States. It occurs more frequently among individuals of African ancestry, although people from many ethnic backgrounds may be affected.

Sickle cell disease results from an inherited genetic mutation that produces abnormal hemoglobin within RBCs. Under certain conditions, affected RBCs may become rigid and develop a curved or sickle-like shape instead of their usual flexible, round appearance. These abnormal cells move less efficiently through small blood vessels and may carry oxygen less effectively, increasing the risk of tissue hypoxia and other complications.

Sickled RBCs also have a considerably shorter lifespan than normal red blood cells. Although the body continually produces replacement RBCs, the cells may be destroyed faster than they can be replaced. As a result, individuals with sickle cell disease commonly develop chronic anemia and may have fewer circulating RBCs than the body requires.

1. Acute Complications of Sickle Cell Disease Acute worsening of sickle cell disease may appear in several forms. Vaso-occlusive crisis: A vaso-occlusive crisis occurs when sickled RBCs obstruct small blood vessels and reduce blood flow to tissues and organs. This can result in severe pain, ischemia, and tissue or organ damage if the obstruction persists. Episodes may last for several days and, in severe cases, can become life-threatening. Acute chest syndrome: Acute chest syndrome is a serious complication of sickle cell disease involving vaso-occlusion and inflammation within the lungs. Patients may present with symptoms resembling pneumonia, including chest pain, fever, cough, shortness of breath, and hypoxia. Although the presentation can resemble pneumonia, acute chest syndrome is a distinct sickle cell complication and requires prompt medical evaluation. Acute splenic sequestration syndrome: This complication occurs when large amounts of blood become trapped within the spleen, causing rapid splenic enlargement and reducing the amount of circulating blood available to the rest of the body. The resulting decrease in oxygen-carrying capacity can produce weakness, pallor, tachycardia, tachypnea, and abdominal pain. Splenic sequestration occurs most often in pediatric patients and can rapidly progress to severe hypovolemia or shock.
2. Patient Management Prehospital management of a patient experiencing a sickle cell crisis is primarily supportive and focuses on stabilizing the patient until definitive treatment is available. EMS providers should perform a thorough assessment, monitor airway and breathing, evaluate oxygenation, and administer oxygen when the patient is hypoxemic or otherwise meets local treatment criteria. IV access and fluid therapy may be indicated according to local protocol, particularly when dehydration or hypovolemia is suspected. Maintaining adequate hydration can help support circulation, although excessive fluid administration should be avoided. Temperature management is also important because temperature extremes may contribute to sickling or worsen symptoms. Keep the patient comfortably warm and avoid unnecessary exposure to cold. Pain is one of the most common complaints during vaso-occlusive episodes. When permitted by protocol and scope of practice, appropriate analgesia should be provided. Continue reassessment during transport and monitor for signs of respiratory deterioration, shock, neurologic changes, or other serious complications.

Hematologic Disorders

There are numerous hematologic conditions that directly affect the blood, blood-cell production, clotting, and other related body functions.

Anemia occurs when the number of circulating red blood cells or the amount of hemoglobin is lower than normal. Because RBCs and hemoglobin are responsible for carrying oxygen, anemia can significantly reduce the body’s ability to deliver adequate oxygen to tissues.

Anemia is frequently associated with another underlying illness or medical condition. It can also develop because of either acute or chronic blood loss.

There are several forms of anemia, with iron-deficiency anemia being one of the most common. Typical causes include gastrointestinal bleeding, heavy menstrual bleeding, inadequate iron availability, or other sources of blood loss. In children, anemia may also occur in association with prematurity, low birth weight, nutritional deficiencies, or other medical problems.

Sickle cell anemia is another form of anemia and is directly associated with sickle cell disease, which was discussed earlier.

Leukopenia is a condition characterized by an abnormally low number of white blood cells, particularly the cells responsible for defending the body against infection.

When the number of circulating leukocytes becomes too low, the body’s ability to fight infections and recover from infectious illnesses can be significantly impaired.

Common causes of leukopenia may include:

• Blood or bone marrow disorders, including leukemia.
• Certain congenital conditions.
• Infectious diseases such as HIV and tuberculosis.
• Chemotherapy and other cancer treatments.
• Autoimmune disorders.
• Certain medications.

Thrombocytopenia occurs when the platelet count becomes abnormally low. Because platelets are essential for normal hemostasis, a severe reduction can interfere with the body’s ability to form effective blood clots.

Patients with significant thrombocytopenia may bleed more easily, and injuries may become more dangerous because bleeding can be difficult to control.

The condition may result from disorders affecting the blood or bone marrow, certain cancers, immune-system abnormalities, medications, or other underlying illnesses.

Leukemia is a type of cancer that affects the blood-forming tissues, particularly the bone marrow, and commonly involves abnormal production of white blood cells.

In leukemia, abnormal blood cells may multiply excessively or fail to develop normally. This can interfere with the production of healthy RBCs, WBCs, and platelets. As a result, patients may experience complications such as anemia, thrombocytopenia, abnormal WBC counts, and increased susceptibility to infection.

Leukemia may occur in acute or chronic forms. Treatment varies according to the specific type and may include chemotherapy and other cancer therapies. Chemotherapy itself may suppress normal WBC production and contribute to leukopenia.

Because patients with leukemia may have impaired immune defenses, EMS providers should use appropriate infection-control precautions and minimize unnecessary exposure to infectious organisms. Even relatively minor illnesses, such as respiratory or skin infections, can become serious in an immunocompromised patient.

Common findings may include:

• Generalized weakness or fatigue.
• Headache.
• Shortness of breath.
• Pallor.
• Frequent or severe infections.
• Easy bruising or bleeding.
• Tachycardia.
• Hypotension in seriously ill patients.

Some patients may present with findings similar to shock, particularly when severe anemia, bleeding, infection, or another complication is present.

Lymphoma is a cancer originating from cells of the lymphatic system. The two major categories are Hodgkin lymphoma and non-Hodgkin lymphoma.

These disorders can vary greatly in their progression. Some develop slowly, while others progress much more aggressively. As with many cancers, treatment outcomes are influenced by the type of lymphoma, how advanced it is, and how early treatment begins.

Lymphoma commonly affects the lymph nodes, which may enlarge gradually over weeks, months, or even longer periods. Other possible symptoms include fatigue, unexplained weight loss, night sweats, fever, and generalized discomfort or pain.

For patients requesting EMS assistance because of lymphoma-related complications, prehospital care is usually supportive. Treatment may include pain management, positioning, emotional support, monitoring, and transport for definitive evaluation.

Polycythemia is a disorder in which the body produces an excessive number of red blood cells. The increased number of RBCs can make the blood more viscous, or thicker than normal.

Higher blood viscosity can slow blood flow and increase the risk of abnormal clot formation. These clots may contribute to serious emergencies such as:

• Deep vein thrombosis.
• Pulmonary embolism.
• Transient ischemic attack.
• Stroke.
• Myocardial infarction.

Polycythemia itself generally cannot be definitively treated by EMS. However, the complications resulting from it may require immediate prehospital care. A known history of polycythemia should be included in the handoff report because it may help explain the patient’s presenting emergency.

Disseminated intravascular coagulation (DIC) is a serious condition in which abnormal clotting occurs throughout the body’s blood vessels. At the same time, platelets and clotting factors are consumed, which can eventually lead to severe bleeding.

DIC usually develops secondary to another major medical problem, such as severe trauma, sepsis, obstetric complications, malignancy, or another critical illness.

Because DIC often occurs alongside a more obvious medical emergency, it may be difficult to identify specifically in the prehospital setting. Patients can deteriorate rapidly because of uncontrolled bleeding, impaired circulation, organ dysfunction, and hypoperfusion.

EMS management primarily focuses on supportive care, recognition of shock, treatment of associated emergencies, and rapid transport.

Hemophilia is an inherited bleeding disorder in which the blood lacks adequate amounts of specific clotting factors. Because of this deficiency, the clotting process does not function normally and bleeding may continue longer than expected.

The most common forms are inherited through the X chromosome, which is why the disorder occurs more frequently in males.

When evaluating a patient with known hemophilia, EMS providers should consider both obvious and hidden bleeding. Internal hemorrhage may occur even when external injuries appear minor.

Possible signs of significant blood loss or hypoperfusion include:

• Shortness of breath.
• Pale, cool, or altered skin color.
• Changes in mental status.
• Tachycardia.
• Weakness or dizziness.
• Hypotension.
• Other signs of shock.

There are two major types of hemophilia:

• Hemophilia A: Caused by a deficiency of clotting factor VIII.
• Hemophilia B: Caused by a deficiency of clotting factor IX.

Although the underlying clotting-factor deficiency differs, patients with either type can present with similar bleeding-related complaints in the prehospital setting.

Multiple myeloma is a cancer involving plasma cells within the bone marrow. Abnormal plasma cells multiply and can interfere with normal bone marrow function.

The disease may also damage bone tissue and interfere with normal production of RBCs, WBCs, and platelets. This can contribute to complications such as anemia, increased susceptibility to infection, abnormal bleeding, bone pain, and fractures.

In the absence of another immediate medical emergency, EMS management is usually supportive. Care may include pain control, comfort measures, monitoring, treatment of associated complications, and transport for definitive medical care.

Adverse Reactions to Blood Transfusions

Blood transfusions are frequently used during surgery, trauma care, and treatment of severe anemia or blood loss. Although transfusions can be lifesaving, patients may occasionally experience an adverse reaction ranging from mild symptoms to a potentially life-threatening emergency.

A hemolytic transfusion reaction occurs when the recipient’s immune system attacks transfused red blood cells, usually because of incompatibility between the donor’s and recipient’s blood.

Destruction of transfused RBCs may cause a severe systemic reaction. Careful blood typing and compatibility testing before transfusion greatly reduce the risk.

A febrile reaction is one of the more frequently encountered transfusion reactions. Patients may develop fever, chills, and discomfort during or shortly after the transfusion.

Although many febrile reactions are not life-threatening, they must still be evaluated because fever may also be associated with more serious transfusion complications.

An allergic transfusion reaction develops when the recipient reacts to proteins or other substances contained in the transfused blood product.

Symptoms may appear shortly after the transfusion begins and can resemble other allergic reactions. Mild reactions may produce itching or hives, while a severe reaction may progress to anaphylaxis with airway swelling, respiratory distress, and hypotension.

Transfusion-related acute lung injury (TRALI) is a serious transfusion complication that can produce acute respiratory distress and noncardiogenic pulmonary edema.

Increased pulmonary capillary permeability allows fluid to move into the lungs, impairing oxygen exchange. Because the pulmonary edema is not primarily caused by heart failure or simple fluid overload, treatment differs from that used for typical cardiogenic pulmonary edema.

Transfusion-associated circulatory overload (TACO) occurs when blood or other fluids are administered faster or in greater amounts than the patient’s circulatory system can tolerate.

The resulting fluid overload may resemble congestive heart failure and can produce shortness of breath, pulmonary edema, hypertension, and other signs of volume overload. Patients with preexisting heart or kidney disease may be at greater risk.

Bacterial contamination of blood products can cause a severe systemic infection following transfusion. Although careful storage, screening, and handling procedures reduce this risk, contamination can lead to sepsis if it occurs.

Affected patients may develop fever, chills, hypotension, tachycardia, and other signs of systemic infection. Immediate recognition and definitive hospital treatment, including antimicrobial therapy when indicated, are essential.