equations Flashcards by Riley Hrasky | Brainscape

Q

alveolar ventilation (VA)

A

VA = VT-VD

VT = tidal volume
VD = dead space

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Q

alveolar minute ventilation (vee dot A)

A

V dot A = VA X breaths/min

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Q

total lung capacity (TLC)

A

VC x RV

VC = vital capacity
RV = residual volume

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Q

functional residual volume (FRC)

A

ERV + RV

ERV = expiratory reserve volume

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Q

partial pressure of oxygen in inspired air (PIO2)

A

(barometric pressure - 47) x FIO2 (usually 0.21)

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Q

alveolar gas equation (PAO2)

A

PAO2 = PIO2 - (PaCO2/RQ)

RQ = 0.8

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