An incompetent ventilator pressure-relief valve can result in

An incompetent ventilator pressure-relief valve can result in

• A. Hypoxia
• B. Barotrauma
• C. A low-circuit-pressure signal
• D. Hypoventilation

Answer: (D)

The key idea is what the pressure-relief valve does: it protects the airway and lungs by venting excess pressure in the circuit. If that valve is incompetent, the circuit can build up higher than intended pressures during inspiration. That elevated back-pressure makes it harder for the ventilator to deliver a normal tidal volume, and it can impede effective ventilation for the patient. The result is reduced alveolar ventilation, leading to carbon dioxide retention and hypoventilation. While high pressures raise the risk of barotrauma, the most direct consequence in this scenario is inadequate ventilation and CO2 buildup, i.e., hypoventilation.

The key idea is what the pressure-relief valve does: it protects the airway and lungs by venting excess pressure in the circuit. If that valve is incompetent, the circuit can build up higher than intended pressures during inspiration. That elevated back-pressure makes it harder for the ventilator to deliver a normal tidal volume, and it can impede effective ventilation for the patient. The result is reduced alveolar ventilation, leading to carbon dioxide retention and hypoventilation. While high pressures raise the risk of barotrauma, the most direct consequence in this scenario is inadequate ventilation and CO2 buildup, i.e., hypoventilation.