A patient has a VT of 625 ml and a physiological dead space of 275 ml and is breathing at a fre-quency of 16/min. What is the alveolar ventilation (VA)?
a. 3000 ml/min
b. 4400 ml/min
c. 5600 ml/min
d. 7000 ml/min
ANS: C
Alveolar ventilation depends on tidal volume, dead space, and breathing rate. For this patient the respiratory rate is 16, VT of 625 ml, and dead space (VD) of 275 ml. The alveolar ventilation is calculated as follows:
VA = 16 ? (625 ml – 275 ml) = 16 ? 350 = 5600 ml/min or 5.6 L/min
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