What is a symptom indicating the need for CPAP in respiratory distress?

The choice highlighting shortness of breath (SOB) while lying supine is indicative of respiratory distress that may necessitate the use of Continuous Positive Airway Pressure (CPAP). When a patient experiences SOB in the supine position, it suggests that gravity is impacting lung mechanics, which can lead to increased difficulty in breathing. This positional dyspnea is often associated with conditions such as congestive heart failure and obstructive sleep apnea. CPAP helps by providing a continuous airflow that keeps the airways open, improving oxygenation and reducing the work of breathing, which addresses this symptom effectively.

In contrast, palpitations, stable vital signs, and a dry cough do not specifically indicate an immediate need for CPAP. Palpitations can arise from various cardiac issues, stable vital signs suggest that the patient may not be in acute distress, and a dry cough may indicate a minor respiratory issue or irritation rather than significant respiratory failure. Therefore, SOB while lying supine is the most critical symptom pointing to the possible requirement for CPAP intervention.