AEMCA Practice Exam

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What percentage of oxygen does a patient typically receive from a BVM with O2 flowing at 10-15 liters/min?

70-80%
80-90%
90-100%
100-110%

The correct answer is: 90-100%

When using a Bag-Valve-Mask (BVM) with supplemental oxygen flowing at 10-15 liters per minute, a patient typically receives about 90-100% oxygen. The BVM system is designed to provide positive pressure ventilation, and when it is combined with supplemental oxygen, it significantly enhances the oxygen concentration delivered to the patient. This high flow rate of oxygen ensures that a substantial amount of oxygen is mixed into the air being delivered through the mask, allowing for higher oxygen saturation in the patient's blood. In clinical settings, the effectiveness of the BVM depends on a proper seal between the mask and the patient's face, as well as the technique used to squeeze the bag, therefore achieving the upper limits of oxygen delivery is dependent on those factors. It is customary to approximate the oxygen delivered with a BVM at these flow rates to be within the 90-100% range under optimal conditions.