Mechanical Ventilation in the Obese Patient

• Obesity can result in decreased lung volumes, decreased lung and chest wall compliance, and increased work of breathing.
• Unfortunately, there is very little literature to guide the emergency physician on mechanical ventilation in obese patients.
• A recent study of intubated ED patients by Goyal, et al found that over 1 in 5 patients were ventilated with potentially injurious tidal volumes.
• Importantly, obesity increased the odds of inappropriate ventilator settings.
• In the intubated obese patient, be sure to set tidal volume based on ideal body weight and consider starting with a higher PEEP setting (i.e., 10 to 15 cm H2O).

References

Goyal M, et al. Body mass index is associated with inappropriate tidal volumes in adults intubated in the ED. Am J Emerg Med 2016; 34:1682-3.