Mouth to mouth respiration provides what percentage
of oxygen ?
a) 10%
b) 16%
c) 21%
d) 100%
Correct Answer - B
Ans. B. 16%
Mouth to mouth breathing provides 0.8 to 1.2 liters of exhaled air per
breath and 16% of oxygen which is enough to sustain life.
The use of Ambu bag and room air provides 21% O2.
The American Heart Association recommends tidal volumes of 700
to 1000 mL during mouth-to-mouth ventilation, but smaller tidal
volumes of 500 mL may be of advantage to decrease the likelihood
of stomach inflation, as mouth-to-mouth ventilation gas contains only
17% oxygen, but 4% carbon dioxide