What is the oxygen concentration delivered by a bag-valve-mask resuscitator?

Using a bag-valve-mask (BVM) resuscitator typically delivers an oxygen concentration of around 90% or higher, especially when used correctly. This high concentration is achieved because the device allows for effective positive pressure ventilation to the patient, which facilitates the delivery of oxygen-rich air directly to the lungs.

When using a BVM, it is crucial to ensure a good seal around the mask and to provide sufficient tidal volume with each squeeze of the bag. If done properly, the BVM can significantly enhance oxygenation, maintaining higher levels of oxygen in the patient’s bloodstream in emergencies like respiratory arrest.

The incorrect options represent lower percentages of oxygen concentration typically not achieved with a well-functioning BVM setup. A concentration lower than 90% would indicate poor bag technique or inadequate oxygen supply, which would not be expected when using this device effectively in an emergency response scenario.