Gas Exchange

Chronic Bronchitis

• Definition: A chronic inflammatory condition affecting the airways.

• Key Points:
    - Causes:
      - Chronic exposure to irritants, particularly cigarette smoke.
      - Leads to significant inflammation and excess mucus production.
    - Signs and Symptoms:
      - Presence of a chronic productive cough with large amounts of thick mucus.
      - Inflammation result in:
        - Vasodilation and mucosal edema.
        - Congestion and bronchospasm.
        - Possible cyanosis (bluish skin).
    - Characteristics:
      - Cough with copious amounts of sputum.
      - Shortness of breath (SOB).
      - Exercise intolerance.
      - Wheezes and crackles during auscultation.
      - Inability to maintain stable arterial blood gases (ABGs), leading to hypoxemia and described as “Blue Bloater”.
    - Diagnosis:
      - Mucus-producing cough occurring most days of the month for 3 months over a 2-year period.
    - Interventions:
      - Bronchodilators to relieve airway constriction.
      - Inhaled corticosteroids to reduce inflammation.
      - Oxygen therapy to assist with oxygen saturation.
      - Primary advice: Smoking cessation to prevent further damage.

Emphysema

• Definition: A progressive lung disease characterized by damage and rupture to the inner structure of alveoli.

• Causes:
    - Smoking is the primary cause.
    - Genetic factors may also contribute.
    - Frequent respiratory infections.
    - Age over 65.
    - Asthma and exposure to environmental irritants.

• Signs and Symptoms:
    - Patient appears pink in skin tone, referred to as “Pink Puffer”.
    - Physical signs include:
      - Pursed lips and barrel chest appearance.     - Fast breathing and shortness of breath (SOB).
      - Minimal cough compared to Chronic Bronchitis.
      - Weight loss and fatigue.

• Treatment:
      - Use of bronchodilators to facilitate airflow.
      - Corticosteroids for inflammation management.
      - Breathing techniques, including tripod positioning to ease breathing.
      - Nutritional support: High caloric intake and protein-rich foods.

• Patient Education:
      - Importance of smoking cessation.
      - Effective breathing techniques.
      - Encourage small, frequent meals and hydration to prevent fatigue.

Asthma

• Definition: A chronic obstructive lung disease characterized by impaired gas exchange and airway obstruction due to bronchoconstriction.

• Causes:
    - Inflammatory response of mucous membranes.
    - Triggers include allergens, irritants (cold air, air pollutants), certain drugs (aspirin, NSAIDs), gastroesophageal reflux disease (GERD), physical activity, and upper respiratory infections (URI).

• Diagnosis:
    - Based on patient’s medical history, physical examination, and test results (e.g., pulmonary function tests).

• Symptoms:
    - Wheezing, increased respiratory rate, frequent cough, use of accessory muscles for breathing, barrel chest due to air trapping, prolonged breathing cycles, cyanosis, and hypoxemia.

• Interventions:
    - Education about breathing exercises.
    - Medication management incorporating both long-term control and quick-relief medications.
    - Albuterol (SABA) for fast relief during an attack; Salmeterol for long-acting control.
    - Develop an Asthma Action Plan with defined green, yellow, and red zones to assess severity and appropriate interventions during acute attacks.   - Skills to avoid long-acting steroids (LABA) as part of the management plan.

• Emergency Actions:
    - Always carry a rescue inhaler for acute situations.
    - Perform pulmonary function testing (PFT) with spirometry for monitoring.

Management of COPD (Chronic Obstructive Pulmonary Disease)

• Key Concerns:
    - For patients with chronic bronchitis and emphysema, maintain oxygen saturation above 90%.   - Provide supplemental oxygen (1L-2L) based on comfort level and saturation readings.   - Observe for acute changes such as restlessness and anxiety, especially below 89% oxygen saturation.
    - Monitor for clubbing of fingernails which indicates chronic low oxygen.   - Offer educational resources to improve patients’ quality of life, including managing meals (small portions to avoid fatigue) and hydration.   - Use of incentive spirometer to encourage deep breathing and lung expansion.

Pneumonia

• Definition: Inflammation of lung tissue due to excess fluid accumulation, affecting alveoli, bronchioles, and interstitial spaces.

• Types:
    - Community-acquired pneumonia.
    - Nosocomial pneumonia (hospital-acquired).

• Causes:
    - Infectious agents like bacteria, viruses, mycoplasmas, fungi, rickettsia, protozoa, and helminths.
    - Non-infectious causes like inhalation of toxic gases and chemical fumes, as well as aspiration.

• Risk Factors:
    - Older adults, patients with chronic lung diseases, those with altered level of consciousness, recent aspiration events, and immunocompromised individuals.

• Signs and Symptoms:
    - Increased respiratory rate and depth of breathing.
    - Flushed cheeks, chest pain/discomfort, hypoxemia, wheezing, crackles, or diminished breath sounds.
    - Presence of cough with purulent or blood-tinged sputum and fever.

• Interventions:
    - Administer oxygen therapy to improve oxygenation.
    - Encourage the use of an incentive spirometer and fluids for hydration.
    - Monitor intake and output carefully to assess hydration status.   - Medications include bronchodilators, nebulizers, antibiotics, antivirals, and antipyretics as needed.

• Prevention Strategies:
    - Promote vaccinations against preventable diseases.   - Advise adequate sleep and avoidance of crowded areas during flu season, along with reducing exposure to outdoor pollutants.

• Laboratory Tests:
    - ABG (arterial blood gases), blood urea nitrogen (BUN), creatinine, complete blood count (CBC), electrolytes, and chest X-ray of the lungs to assess disease state.

• Patient Education:
    - Encourage frequent change of position.   - Stress the importance of small, frequent meals and maintaining hydration.