What causes the high pressure alarm on a ventilator to activate?

• A. Low oxygen levels due to device failure
• B. The patient is coughing
• C. Tubes clogged or patient biting tube; increase sedation and suction
• D. Ventilator settings too high

Answer: (C)

A high pressure alarm means the ventilator is meeting more resistance than expected to deliver a breath, so the peak inspiratory pressure rises above the set limit. The most likely and best explanation is that something is obstructing the airway or the circuit—like secretions clogging the tube or the patient biting the tube. When the tube is blocked or the patient bites, the ventilator has to push harder to deliver air, triggering the alarm. Clearing the obstruction and reducing the patient’s resistance directly addresses the cause: suction out secretions and reduce fighting against the ventilator by increasing sedation if needed.

Other scenarios are less consistent with this alarm. A drop in oxygen levels points to oxygenation issues rather than a sudden rise in pressure. A coughing episode can cause brief pressure spikes but isn’t the typical ongoing cause of a persistent high pressure alarm. Setting the ventilator pressure too high could trigger the alarm, but that’s more about a configuration issue than an acute obstruction; the immediate, correct action is to check for and relieve airway or circuit resistance first.