What percentage of oxygen is delivered to a patient when using a bag-valve-mask without supplemental oxygen?

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Multiple Choice

What percentage of oxygen is delivered to a patient when using a bag-valve-mask without supplemental oxygen?

Explanation:
When a bag-valve-mask is used without any supplemental oxygen, the gas the patient inhales is basically room air. Room air contains about 21 percent oxygen, so the delivered FiO2 is roughly 21%. The amount can vary a bit with how well the mask seals and how quickly you squeeze the bag, but it generally stays near ambient air. You only get higher oxygen concentrations if you attach an oxygen source to the bag (or use a reservoir), which increases the FiO2 toward values closer to 100% with proper technique. So, without supplemental oxygen, 21% is the typical expectation.

When a bag-valve-mask is used without any supplemental oxygen, the gas the patient inhales is basically room air. Room air contains about 21 percent oxygen, so the delivered FiO2 is roughly 21%. The amount can vary a bit with how well the mask seals and how quickly you squeeze the bag, but it generally stays near ambient air.

You only get higher oxygen concentrations if you attach an oxygen source to the bag (or use a reservoir), which increases the FiO2 toward values closer to 100% with proper technique. So, without supplemental oxygen, 21% is the typical expectation.

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