Respiratory Diseases and Clinical Management

• Clinical Presentation: Patients often present with sudden onset of chills, fever, pleuritic chest pain, dyspnea, and productive cough with purulent sputum.
• Nursing Care: Management includes increasing fluids, administering oxygen, and monitoring for signs of sepsis or respiratory failure. For influenza, antiviral medications like Oseltamivir are most effective when started within 24–48 hours of symptom onset.

Obstructive Lung Diseases

Chronic Obstructive Pulmonary Disease (COPD)

COPD is a progressive airflow obstruction that is not fully reversible. It encompasses two primary conditions: Emphysema and Chronic Bronchitis.

• Chronic Bronchitis: Defined by a cough and sputum production lasting $\ge 3$ months for at least two consecutive years. Pathophysiology involves thickened bronchial walls, reduced ciliary function, and mucus plugs.
• Emphysema: Characterized by alveolar damage and destruction.
• Clinical Manifestations: Common signs include chronic sputum production, dyspnea, a "barrel chest," and the use of accessory muscles. Patients may adopt a "tripod position" to assist breathing.

Asthma and Status Asthmaticus

Asthma is a chronic inflammatory disease of the airways characterized by hyperresponsiveness and mucus production.

• Management:
  • Rescue Inhalers: Short-acting beta-2 agonists (e.g., Albuterol) provide rapid relief.
  • Maintenance: Long-acting beta-2 agonists, corticosteroids, and leukotriene modifiers are used for prophylaxis.
  • Inhaler Technique: When using a Metered Dose Inhaler (MDI), patients should shake the device, inhale slowly and deeply while pressing the canister, and hold their breath for 10 seconds. Using a spacer can increase the amount of medication received.
• Status Asthmaticus: A medical emergency where asthma becomes severe and unresponsive to conventional therapy. Treatment includes nebulized albuterol, corticosteroids, and magnesium sulfate to relax smooth muscle.

Cardiovascular and Pulmonary Complications

Cor Pulmonale

Cor pulmonale is right ventricular enlargement caused by primary respiratory disorders, most commonly COPD.

• Pathophysiology: Chronic hypoxemia triggers the body to produce more red blood cells (polycythemia) to carry more oxygen. This increases blood viscosity and pulmonary vascular resistance, placing an extra workload on the right ventricle.
• Signs of Right-Sided Heart Failure: As the right ventricle fails, patients may exhibit Jugular Venous Distention (JVD), hepatomegaly, peripheral edema, and weight gain.
• Interventions: Management includes diuretics to decrease plasma volume, bronchodilators, anticoagulants, and therapeutic phlebotomy (removing $\approx 500\text{ mL}$ of blood) to reduce polycythemia.

Pulmonary Embolism (PE)

A PE occurs when a thrombus (usually from the venous system) obstructs a pulmonary artery.

• Clinical Picture: This causes a ventilation-perfusion imbalance, where parts of the lung are ventilated but not perfused. Symptoms include sudden, sharp chest pain, dyspnea, and tachycardia.
• Management: Treatment involves oxygen, anticoagulation (often for 3–6 months), and potentially surgical interventions like an embolectomy.

Acute Respiratory Events and Interventions

Atelectasis and Aspiration

• Atelectasis: The collapse of alveoli, often occurring acutely in postoperative patients. Symptoms include dyspnea, cough, and decreased breath sounds. Prevention involves frequent turning, early mobilization, and the use of incentive spirometry.
• Aspiration: The inhalation of foreign material into the lungs, a major risk factor for pneumonia.

  Nursing Alert: To prevent aspiration, keep the Head of Bed (HOB) elevated $> 30$ degrees, check tube placement before feedings, and use thickened fluids for patients with swallowing difficulties.

Pneumothorax and Chest Tubes

A pneumothorax is an accumulation of air in the pleural space, which can be spontaneous or traumatic.

• Chest Tubes: Used to remove air or fluid to re-expand the lung. Systems can be wet (water seal) or dry suction.
• Monitoring: In a water seal chamber, "tidaling" (fluid moving up and down with respiration) is an expected finding. Continuous bubbling indicates an air leak.

Oxygen and Mechanical Ventilation

Oxygen delivery ranges from low-flow (nasal cannula) to high-flow (High-Flow Nasal Cannula) and non-invasive ventilation (CPAP/BiPAP).

• CPAP vs. BiPAP: CPAP provides continuous pressure (useful for sleep apnea), whereas BiPAP provides pressure support during both inspiration and expiration (useful for COPD exacerbations and pulmonary edema).
• Mechanical Ventilation: For patients in respiratory failure, endotracheal intubation may be required.
  • Nursing Care: Perform oral care every 2 hours with chlorhexidine to prevent ventilator-associated pneumonia.
  • Complications: Monitor for barotrauma, volutrauma, and hemodynamic compromise due to increased thoracic pressure.

Exam Tip: When a patient is on multiple inhalers, always administer the bronchodilator first. This opens the airways to increase the absorption of the subsequent anti-inflammatory medication.