Chronic Obstructive Pulmonary Disease (COPD)

Introduction

Chronic Obstructive Pulmonary Disease (COPD) is a group of progressive lung disorders that cause airflow limitation and breathing difficulties. More than 16 million Americans have been diagnosed with COPD, while many others remain undiagnosed. The most common forms of COPD are emphysema and chronic bronchitis. Although COPD cannot be cured, symptoms can often be managed with medications and supportive treatments. Smoking tobacco is the leading cause of COPD because it creates permanent damage to lung tissue and may also contribute to lung cancer development.

Other causes and risk factors for COPD include:

COPD can lead to serious and potentially life-threatening complications, including:

COPD causes airway obstruction through inflammation, mucus buildup, and narrowing of the air passages. Damage to the alveoli further interferes with oxygen exchange. As the disease progresses, many patients experience worsening symptoms and may eventually require long-term supplemental oxygen therapy.

EMS and COPD

Respiratory emergencies are among the most common reasons EMS is activated. Studies estimate that approximately 12% of EMS calls involve respiratory distress. EMS providers play a critical role in recognizing COPD exacerbations and initiating early treatment. Prompt interventions can improve symptoms, prevent deterioration into respiratory failure, and reduce the need for invasive airway management.

Because respiratory distress may result from many different conditions, accurate assessment is essential for selecting appropriate treatment.

Anatomy and Physiology of COPD

Upper Respiratory Tract

The respiratory system is divided into upper and lower airways, separated by the larynx.

Structures of the Upper Airway

Lower Respiratory Tract

The lower airway allows air to travel into the lungs where gas exchange occurs.

Structures of the Lower Airway

Trachea:
The main airway extending from the larynx to the carina.

Carina:
Point where the trachea divides into the right and left bronchi.

Bronchi:
Large conducting airways branching into the lungs.

Bronchioles:
Small muscular airways capable of constricting or dilating.

Alveolar ducts:
Small passages leading to the alveoli.

Alveoli:
Tiny air sacs where oxygen and carbon dioxide exchange occurs across thin membranes.

Supporting Respiratory Structures

Diaphragm

Primary muscle responsible for breathing. During inhalation it contracts, lowering thoracic pressure and pulling air into the lungs. During exhalation it relaxes, allowing air to leave the lungs.

Ribs and Intercostal Muscles

Provide protection and assist chest expansion during breathing.

Pleural Space

Potential space between the lungs and chest wall containing lubricating fluid. Air or fluid accumulation in this space may impair lung function.

Respiratory Physiology

The respiratory system supplies oxygen to body tissues and removes carbon dioxide produced during metabolism. Gas exchange occurs through diffusion, where molecules move from areas of higher concentration to lower concentration.

In the lungs:

The alveolar-capillary membrane is extremely thin, allowing efficient gas exchange.

Common Respiratory Terms
Acid-Base Balance

The respiratory system helps regulate body pH by controlling carbon dioxide levels. Carbon dioxide forms carbonic acid in the bloodstream, making it an important acid-base regulator.

Increased breathing removes more carbon dioxide, while decreased breathing allows carbon dioxide to accumulate.

COPD and Its Effects on the Lungs

COPD progressively damages lung tissue over time.

Chronic Bronchitis

Chronic bronchitis mainly affects the bronchi and bronchioles. Persistent inflammation leads to mucus production, airway narrowing, and chronic cough. Airflow obstruction commonly causes wheezing and breathing difficulty.

Emphysema

Emphysema damages the alveoli, causing them to lose elasticity and shape. Air becomes trapped in the lungs because exhalation is impaired. Chronic air trapping may eventually create a “barrel chest” appearance. Fewer healthy alveoli remain available for gas exchange, increasing the risk of hypoxia and respiratory distress.

Recognition

Patients with COPD often function normally day to day but may experience exacerbations that worsen breathing symptoms.

Common Triggers

Signs and Symptoms

Symptoms may include:

Typical COPD exacerbations often present with wheezing, shortness of breath, and hypoxia.

Assessment

A thorough assessment is important to identify the cause of respiratory distress.

Helpful Questions

Physical Assessment Findings

Assess for:

Consider other causes of respiratory distress such as:

Treatment and Management

Initial Assessment

Follow standard EMS priorities:

Obtain baseline vital signs including:

A “shark fin” waveform on capnography may indicate bronchospasm.

Treatments

Supplemental Oxygen

Oxygen delivery may include:

Bronchodilators

Albuterol and ipratropium (DuoNeb) help dilate bronchioles and improve airflow. Nebulizer oxygen flow is typically 6–8 LPM.

Corticosteroids

Steroids such as dexamethasone or methylprednisolone help reduce airway inflammation and improve outcomes.

CPAP and BiPAP

Positive pressure ventilation can improve oxygenation, reduce respiratory distress, and decrease the need for intubation. These therapies also help recruit collapsed alveoli.

Epinephrine

Some EMS systems allow epinephrine administration for severe bronchospasm. Providers should follow local protocols and use caution in patients with cardiovascular disease.

Advanced Airway Management

Patients with worsening fatigue, altered mental status, respiratory failure, or arrest may require advanced airway placement. Continue supportive treatments alongside airway management whenever possible.

Transport Considerations

Most hospitals can stabilize COPD exacerbations, but severe cases may require ICU admission and prolonged ventilator support. Oxygen supply and transport distance should always be considered during prolonged transports.

Scenario Summary

A 55-year-old female with COPD develops severe respiratory distress after physical activity in cold weather. She presents with wheezing, accessory muscle use, hypoxia, and tachycardia. EMS administers oxygen, DuoNeb, IV dexamethasone, and cardiac monitoring. The patient improves significantly during transport and is later discharged after hospital evaluation.

This scenario highlights the importance of:

Signs of decompensation include:

Key Points