What is the minimum flow rate that should be set on a volume-controlled ventilator?

In volume-controlled ventilation, the flow rate is essential in determining how quickly the set tidal volume is delivered to the patient. The minimum flow rate should be adequate to ensure that in a timely manner, the complete volume can be delivered, allowing for sufficient time for exhalation.

Setting the minimum flow rate too low can lead to inadequate ventilation, causing longer inspiratory times and potentially compromising patient comfort and gas exchange. A flow rate around 25 L/min is typically sufficient for most adult patients receiving mechanical ventilation, enabling rapid delivery of the tidal volume while minimizing the risk of breath stacking, which can occur when the patient's demand for airflow exceeds what is being delivered.

Use of flow rates higher than this minimum can be implemented based on the specific needs of the clinical situation, the type of patient, and desired inspiratory time, but in general practice, a flow rate of 25 L/min is considered the starting point for effective volume control in mechanical ventilation.