What is the appropriate tidal volume for mechanical ventilation in adults?

The appropriate tidal volume for mechanical ventilation in adults is typically set at 6-8 mL/kg of predicted body weight. This range is considered optimal for providing adequate ventilation while minimizing the risk of ventilator-induced lung injury. This practice aligns with the principles of lung protective ventilation strategies, which aim to avoid excessive volume that could lead to over-distension of alveoli and barotrauma.

Setting the tidal volume within this range helps ensure effective gas exchange and maintains sufficient minute ventilation without compromising pulmonary function. Predicted body weight takes into account the individual’s height and is a better method for determining appropriate ventilator settings than actual body weight, especially in overweight or obese patients.

Using volumes outside of this recommended range can lead to complications. For instance, using a tidal volume that is too low may result in insufficient ventilation and respiratory acidosis, while a tidal volume that is too high can contribute to respiratory distress syndrome and other complications associated with mechanical ventilation.