What is the recommended tidal volume for a mechanically ventilated patient?

The recommended tidal volume for a mechanically ventilated patient is generally set at 6-8 mL/kg of ideal body weight. This range is considered optimal for ensuring adequate ventilation while minimizing the risk of ventilator-induced lung injury. Tidal volumes that are too high can lead to overdistension of the alveoli, potentially causing barotrauma and worsening lung inflammation.

Using 6-8 mL/kg allows for effective gas exchange while balancing the need to avoid excessive pressure and volume delivered to the lungs. This range is especially emphasized for patients with conditions such as Acute Respiratory Distress Syndrome (ARDS), where lung protective strategies are critical in management.

While lower tidal volumes, such as 4-5 mL/kg, might be considered for certain situations or specific patient populations, they generally do not provide enough ventilation for most adult patients, particularly those with higher metabolic demands. Higher tidal volumes (8-10 mL/kg or 10-12 mL/kg) increase the risks of complications significantly and are typically avoided in standard practice.