A 68-year-old male presents with sudden onset of severe shortness of breath, diaphoresis, and a productive cough with pink, frothy sputum. Auscultation reveals diffuse rales and rhonchi bilaterally. His blood pressure is 180/100 mmHg, heart rate 110 bpm, and SpO2 88% on room air. He has a history of congestive heart failure. Which of the following ventilatory interventions is most appropriate for this patient in the prehospital setting?
- ANasal cannula at 6 L/min with close monitoring of respiratory status.
- BEndotracheal intubation with mechanical ventilation at a tidal volume of 6-8 mL/kg ideal body weight.
- CBag-valve-mask (BVM) ventilation with 100% oxygen at a rate of 10-12 breaths per minute.
- DContinuous positive airway pressure (CPAP) with 100% oxygen and an initial pressure of 5-10 cmH2O.
Show answer & explanationAnswer & explanation
Correct answer: D. Continuous positive airway pressure (CPAP) with 100% oxygen and an initial pressure of 5-10 cmH2O.
The patient's presentation is classic for acute pulmonary edema secondary to congestive heart failure. CPAP is highly effective in this scenario by reducing preload and afterload, improving alveolar recruitment, and decreasing the work of breathing, thereby improving oxygenation and ventilation without the invasiveness of intubation.
Why the other options are wrong
- A. Nasal cannula at 6 L/min is insufficient for a patient with SpO2 88% and severe respiratory distress, and does not provide the positive pressure needed for pulmonary edema.
- B. Endotracheal intubation is an advanced airway procedure reserved for patients who fail CPAP, are apneic, or have severely depressed mental status; it is not the first-line intervention here.
- C. BVM may be indicated for apnea or severe hypoventilation, but CPAP is preferred for spontaneously breathing patients with pulmonary edema.
CPAP for Pulmonary Edema
Continuous Positive Airway Pressure (CPAP) is a non-invasive ventilation technique that applies constant positive pressure to the airways, primarily used in prehospital settings for patients with acute pulmonary edema or severe respiratory distress to improve oxygenation and reduce the work of breathing.
- Reduces preload and afterload, decreasing cardiac workload.
- Increases functional residual capacity and alveolar recruitment.
- Decreases intubation rates and hospital length of stay in appropriate patients.
Memory trick: CPAP Cures Patients' Awful Puffs