What happens when the ventilator reaches the high-pressure limit?

When the ventilator reaches the high-pressure limit, the appropriate response is for excess pressure to be vented through a pop-off valve. This safety feature is designed to protect both the patient and the ventilator from damage due to excessive pressure. The pop-off valve serves as a mechanism that releases gas from the ventilatory system when the pressure exceeds a predetermined threshold, allowing for pressure relief while still maintaining ventilation to the patient.

This function is crucial because it prevents potential barotrauma to the lungs caused by excessively high pressures. Unlike the other options, which suggest halting operation or initiating more invasive measures, the pop-off valve allows the ventilator to continue functioning effectively while managing the airway pressure safely. This illustrates the emphasis on patient safety and the importance of monitoring ventilation pressures during mechanical ventilation.