Equations For Block 1

Question 1

Minute Ventilation (VE)

Answer 1

VE = RR x VT
respiratory rate x tidal volume

Question 2

Alveolar minute ventilation (VA)

Answer 2

VA = (VT - VD) x RR
(Tidal volume - dead space) x respiratory rate

Question 3

Airway resistance (Raw)

Answer 3

Raw = (PIP - Pplat) / flow

Question 4

Alveolar gas

Answer 4

PAO2 = [PB - PH2O) x FiO2 - (PaCO2 / 0.8)

Question 5

Static compliance (Cstat)

Answer 5

Cstat = VT / (Pplat- PEEP)

Question 6

Dynamic compliance (Cdyn)

Answer 6

Cdyn = VT / (PIP- PEEP)

Question 7

IBW (men and women)

Answer 7

men: 106 (6 x “)

women: 105 (5 x “)

Question 8

Respiratory cycle time (RCT)

Answer 8

RCT = 60/RR

Question 9

Lung compliance

Answer 9

^V / ^P

Question 10

Deadspace / anatomic deadspace

Answer 10

Anatomic = 1mL / Lbs (if you have 135lbs, then it’s 135 mL)

Vd = VT - VA

Question 11

Volume/Capacities ,

Answer 11

TLC = IRV + ERV+ RV + VT

IC = IRV + VT (remember ii)

FRC = ERV + RV (remember fre)

,VC = ERV + IRV + VT (remember vei)