A nurse is caring for a patient receiving continuous positive airway pressure (CPAP) therapy. Which nursing action is most important to ensure patient safety during CPAP treatment?

Monitoring for gastric distension and aspiration risk is most critical during CPAP therapy due to positive pressure forcing air into the stomach. Other options address comfort or tolerance but are not the highest safety priority.

Understanding CPAP Therapy and Patient Safety
When caring for a patient on continuous positive airway pressure (CPAP), the nurse must prioritize monitoring for a critical, potentially life-threatening complication: gastric insufflation leading to distension and aspiration. CPAP delivers a constant stream of pressurized air to keep the upper airway open. However, if the pressure exceeds the lower esophageal sphincter pressure (typically around 20-25 cm H2O), air can be forced into the esophagus and stomach rather than the lungs . This is not just a comfort issue; it directly creates a high risk for vomiting and aspiration of gastric contents, which can rapidly deteriorate into aspiration pneumonitis or pneumonia.

Why Other Options Are Less Critical
While the other nursing actions have a place in CPAP management, they do not address an immediate safety threat in the same way.

- Option 1: Encouraging continuous mask use for at least 4 hours is a strategy to improve therapeutic adherence and efficacy, but it is secondary to physiological safety. A patient who aspirates will not benefit from adherence.
- Option 2: Applying petroleum jelly to the nasal bridge is a skin integrity intervention. However, petroleum-based products can degrade the mask's silicone cushion, leading to a poor seal. More importantly, preventing skin breakdown, while a nursing responsibility, is not a higher priority than preventing aspiration.
- Option 4: Gradually increasing CPAP pressure is a technique to improve comfort and tolerance, which is a key determinant of non-invasive respiratory support success . However, a pressure that is titrated too high or without close monitoring can directly cause the gastric distension we are trying to prevent. The nurse must first be vigilant for the complication before focusing on tolerance.

The Pathophysiology of the Risk
The connection between CPAP and gastric distension is a direct physiological consequence of positive pressure. The same pressure that stents open the airway can overcome the gastroesophageal junction. Patients with decreased level of consciousness, a weak cough, or those receiving analgosedation to tolerate the mask are at even greater risk because their airway protective reflexes are blunted . A comprehensive nursing assessment, therefore, must include frequent auscultation of bowel sounds, observation for abdominal distension, and vigilant monitoring for any signs of regurgitation or vomiting. This proactive surveillance is the cornerstone of safe practice, a principle mirrored in structured nursing interventions that improve patient outcomes during respiratory monitoring .