A 6'2" male patient is being ventilated in the volume-controlled continuous mandatory ventilation (VC-CMV) mode with a set tidal volume (VT) of 650 mL. There is 40 mL of mechanical dead space. Calculate the final alveolar ventilation
a. 432 mL
b. 445 mL
c. 510 mL
d. 535 mL
ANS: A
Volume of anatomical dead space (VDanat) = 1 mL/lb ideal body weight (IBW)
IBW = 106 + 6 (ht inches − 60); tidal volume (VT) − volume of mechanical dead space (VDmech) − VDanat.
Health Professions
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