Which clinical sign indicates respiratory distress in a patient who is mechanically ventilated?

• A. Use of accessory muscles
• B. Quiet breathing
• C. No chest movement
• D. Normal oxygen saturation

Answer: (A)

The key idea here is recognizing signs of increased work of breathing in a patient on a ventilator. When a patient is in respiratory distress, they often recruit extra muscles to help with breathing. This shows up as the use of accessory muscles such as the sternocleidomastoid and intercostal muscles pulling more effort from the chest and neck muscles. Seeing these muscles work indicates the ventilator isn’t fully meeting the patient’s ventilatory needs, signaling distress or possible ventilator asynchrony.

Quiet breathing would suggest the opposite: the patient is not exerting extra effort and the airway and ventilation are likely adequate. No chest movement would be alarming and could indicate a disconnection, apnea, or unventilated status, not a typical sign of distress. Normal oxygen saturation means good oxygen delivery and doesn’t point to distress by itself.