In a CPAP system via nasal prongs, which set of conditions could trigger a high-pressure alarm?

• A. 1 and 2 only
• B. 1 and 3 only
• C. 3, 4 and 5 only
• D. 1, 3, 4 and 5 only

Answer: (C)

A high-pressure alarm happens when the pressure in the CPAP circuit rises above what’s set, which occurs when something blocks or narrows the pathway from the blower to the patient. In a nasal CPAP setup, this typically means the flow is being restricted after the machine’s outlet—think partial occlusion of the nasal prongs by secretions or swelling, a kink or compression in the tubing, or a blockage in the airway path that prevents the gas from moving smoothly. Those kinds of resistance push the circuit pressure up and trigger the high-pressure alarm.

The set that includes conditions causing increased circuit resistance is the one that fits this scenario, which is why it’s the correct choice. By contrast, issues like leaks or disconnections tend to lower circuit pressure and trigger a low-pressure alarm, not a high one.

If you encounter this alarm, check the prongs for occlusion or poor fit, inspect the tubing for kinks or compression, and verify the exhalation path is clear.