What is the normal spontaneous tidal volume (VT) in mL/kg?

The normal spontaneous tidal volume (VT) ranges from 5 to 8 mL per kilogram of body weight. This range is essential because it provides an adequate volume for gas exchange while accounting for individual variations in size and respiratory needs.

In healthy adults, this tidal volume is crucial for ensuring that sufficient air reaches the alveoli for oxygenation and carbon dioxide removal during each breath. If the tidal volume is too low, it can lead to inadequate ventilation and respiratory failure, while excessively high tidal volumes can cause barotrauma and volutrauma to the lungs.

Understanding this normal range allows clinicians to set appropriate ventilator settings when mechanical ventilation is necessary and to monitor patients effectively to avoid complications related to improper ventilation strategies.