In pressure-controlled ventilation, the tidal volume delivered is determined by which of the following?

In pressure-controlled ventilation, the tidal volume delivered is significantly influenced by lung compliance. Lung compliance refers to how easily the lungs can expand when pressure is applied. When the inspiratory pressure is set, the ventilator delivers air until that pressure is reached, and the actual tidal volume delivered can vary depending on the compliance of the patient's lungs.

If the lung compliance is high, the tidal volume will usually be greater for the same set inspiratory pressure compared to a situation where lung compliance is low. In cases of reduced compliance, such as in conditions like acute respiratory distress syndrome (ARDS), the same pressure can yield a smaller tidal volume. Thus, while the inspiratory pressure settings are vital for determining how much pressure is applied, the resultant tidal volume ultimately hinges on the lung compliance characteristics.

This understanding helps ensure that ventilation strategies can be tailored to the individual needs of patients, accounting for variations in lung conditions affecting compliance.