During bag-valve-mask (BVM) ventilation of an apneic patient, you observe gastric distension developing. Which of the following is the most appropriate action to minimize this complication?
- ASwitch to a smaller BVM device to reduce air pressure.
- BReduce the delivered tidal volume and ensure a slow, gentle breath over 1 second.
- CIncrease the ventilation rate to compensate for air loss.
- DApply cricoid pressure (Sellick maneuver) continuously.
Show answer & explanationAnswer & explanation
Correct answer: B. Reduce the delivered tidal volume and ensure a slow, gentle breath over 1 second.
Gastric distension during BVM ventilation is often caused by excessive pressure or volume, forcing air into the esophagus and stomach. Reducing the delivered tidal volume to just enough to cause visible chest rise and ensuring a slow, gentle breath over 1 second minimizes the risk of gastric insufflation while still providing effective ventilation.
Why the other options are wrong
- A. The size of the BVM device does not directly cause gastric distension; it's the technique of ventilation that matters. A smaller device would not inherently solve the problem.
- C. Increasing ventilation rate can worsen gastric distension by increasing the amount of air being forced into the stomach.
- D. Cricoid pressure is controversial and not routinely recommended as it can impair ventilation and increase the risk of aspiration; it is not the primary intervention for gastric distension.
Minimizing Gastric Distension in BVM
Gastric distension during bag-valve-mask (BVM) ventilation occurs when air enters the stomach, often due to excessive ventilation pressure or volume. It can lead to regurgitation and aspiration, and can impair lung inflation. Proper technique involves using minimal tidal volume and a slow, gentle breath.
- Caused by excessive pressure or volume.
- Increases risk of regurgitation and aspiration.
- Can reduce lung compliance and ventilation effectiveness.
Memory trick: BVM's Big Volume Mistakes