In VC-CMV, which parameter is set by the clinician?

• A. Tidal volume
• B. Peak inspiratory pressure
• C. Plateau pressure
• D. Mean airway pressure

Answer: (A)

In this mode, the clinician sets the tidal volume. The ventilator delivers breaths to achieve that fixed volume at a chosen rate, using a constant inspiratory flow. The pressure required to deliver the set volume depends on lung compliance and airway resistance, so peak inspiratory pressure varies and is not itself set. Plateau pressure is a measured value obtained during an inspiratory pause and reflects alveolar pressure, not a target you impose. Mean airway pressure is influenced by tidal volume, inspiratory time, rate, and PEEP, and is not directly set as the target parameter in this mode.