What is a manual resuscitator used for?

A manual resuscitator, also known as an Ambu bag, is a device used to provide positive pressure ventilation to individuals who are not breathing or have insufficient breathing. It is commonly used in emergency medical situations, such as in hospitals, ambulances, and in the field by first responders. The device works by using a bag valve mask to force air or oxygen into the lungs of the patient, providing necessary oxygenation and ventilation until more advanced respiratory care can be provided.