A
bag valve mask (also known as a
BVM or
Ambu bag) is a hand-held device used to provide
positive pressure ventilation to a patient who is not breathing or who is breathing inadequately. The device is a normal part of a
resuscitation kit for trained professionals, such as
ambulance crew. The BVM is frequently used in
hospitals, and is an essential part of a
crash cart. The device is used extensively in the operating room to ventilate an anaesthetised patient in the minutes before a
mechanical ventilator is attached. The device is self-filling with
air, although additional
oxygen (O
2) can be added.
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