What type of flow pattern is used in pressure control ventilation?

Pressure control ventilation utilizes a decelerating flow pattern, which is characterized by a dynamic change in the flow rate over the duration of inspiration. In this mode, the ventilator generates a peak flow that is initially high, allowing for rapid delivery of air at the start of inspiration. As the target pressure is reached, the flow gradually decreases to maintain that pressure throughout the breath.

This decelerating flow helps to mimic natural breathing patterns, where airflow is not constant but reduces as air is delivered into the lungs. It promotes better distribution of ventilation in the alveoli, enhancing gas exchange and reducing the risk of barotrauma associated with high pressures and constant flows.

In contrast, other flow patterns like constant flow or accelerating flow do not provide the same benefits of pressure control with respect to maintaining target pressure throughout inspiration and optimizing airflow dynamics within the lungs.