A 65-year-old patient with COPD on mechanical ventilation suddenly develops severe respiratory distress. The ventilator alarms are sounding, and the patient appears cyanotic with decreased oxygen saturation. What is the nurse's first priority action?

When a mechanically ventilated patient develops sudden severe respiratory distress with ventilator alarms and cyanosis, the priority is to ensure immediate ventilation and oxygenation. Disconnecting from the ventilator and providing manual bag-mask ventilation bypasses potential equipment failure and provides immediate support.

Clinical Judgment This question assesses emergency situation judgment by combining Recognize Cues and Prioritize Hypotheses. The key cues are "sudden severe respiratory distress," "ventilator alarm," "cyanosis," and "decreased oxygen saturation." These signs strongly suggest the patient's airway and ventilation are being immediately threatened. The nurse's first priority is not to investigate potential equipment problems, but to sustain the patient's life. When a ventilator malfunction is suspected, the safest action is to bypass the equipment and ensure direct ventilation and oxygenation. Notify HCP! While this is the situation, you must first protect the patient's life before doing so. Memory Tip: Remember the mnemonic DOPE for mechanical ventilation emergencies. Displacement (of the ET tube), Obstruction (airway blockage), Pneumothorax, Equipment failure. If any of these occur, the first action is to Disconnect and manually ventilate. KR vs US: This principle is the same in both Korea and the US. In the event of acute deterioration in a mechanically ventilated patient, immediately discontinuing equipment dependence and taking direct life-sustaining measures (manual ventilation) is an internationally standardized emergency response. This highlights the nurse's autonomous judgment and immediate intervention.

Clinical Practice Guide If a patient on mechanical ventilation suddenly develops respiratory distress, first apply the principle: "Disconnect the patient from the ventilator". After starting manual bag-mask ventilation, you can ask another team member to check the ventilator alarms, auscultate breath sounds, observe chest movement, and verify the oxygen supply source.

Caution: If this scenario appears in a SATA (Select All That Apply) question, the option "Increase FiO2 to 100%" is not an immediate priority action. If the ventilator itself is malfunctioning, changing the settings will not help. Also, the option "Suction the endotracheal tube" is an important intervention when airway obstruction is suspected, but it is an action that should be performed simultaneously with or immediately after disconnecting and attempting manual ventilation. In questions asking for the single first priority action, "Disconnect and manually ventilate" is the correct answer.