equations

Question 1

alveolar ventilation (VA)

Answer 1

VA = VT-VD

VT = tidal volume
VD = dead space

Question 2

alveolar minute ventilation (vee dot A)

Answer 2

V dot A = VA X breaths/min

Question 3

total lung capacity (TLC)

Answer 3

VC x RV

VC = vital capacity
RV = residual volume

Question 4

functional residual volume (FRC)

Answer 4

ERV + RV

ERV = expiratory reserve volume

Question 5

partial pressure of oxygen in inspired air (PIO2)

Answer 5

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

Question 6

alveolar gas equation (PAO2)

Answer 6

PAO2 = PIO2 - (PaCO2/RQ)

RQ = 0.8