An EMT is ventilating an adult patient with a bag-valve mask (BVM). Which of the following is the most effective way to ensure adequate tidal volume is being delivered?
- AObserve the chest rise and fall with each ventilation.
- BMonitor the patient's SpO2 levels.
- CFeel for compliance of the bag during compression.
- DListen for breath sounds over the lungs.
Show answer & explanationAnswer & explanation
Correct answer: A. Observe the chest rise and fall with each ventilation.
Observing visible chest rise and fall with each ventilation is the most direct and reliable visual indicator that an adequate tidal volume is being delivered and that air is entering the patient's lungs. While other options provide useful information, they are secondary or indirect indicators of tidal volume. Listen for breath sounds confirms air movement, but chest rise confirms the volume. Compliance relates to resistance, and SpO2 reflects oxygenation, not directly the volume per breath.
Why the other options are wrong
- B. SpO2 levels indicate oxygenation, which is a result of effective ventilation, but not a direct measure of tidal volume for each individual breath.
- C. Feeling for bag compliance can indicate airway resistance but doesn't directly measure the volume of air entering the lungs.
- D. Listening for breath sounds confirms air movement, but doesn't directly quantify the volume delivered as effectively as chest rise.
BVM Tidal Volume Assessment
The most effective way to ensure adequate tidal volume delivery during BVM ventilation is to observe visible chest rise and fall with each breath.
- Primary indicator: visible chest rise.
- Confirms air entering lungs.
- Other signs are secondary or indirect.
Memory trick: Look for the lift, listen for the whoosh, feel for the squeeze.