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# Formulas

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 Question
What is the formula for MAP   (2 x diastolic) + systolic / 3
What is the formula for the Fick equation or cardiac output   QT = heart rate x stroke volume
What is the formula for cardiac index   CI = QT/BSA or cardiac output/body surface area
What is the formula for pulse pressure   systolic - diastolic
What is the formula for stroke volume   SV = CO/hrt rate
What is the formula for ejection fraction   ejection fraction = stroke volume / end diastolic volume
What is the formula for systemic vascular resistance SVR   SVR = (MAP-CVP)/cardiac output
How do you convert Dynes   multiply mmHg/L/min by 80
What is the formula for pulmonary vascular resistance or PVR   PVR = (MPAP - PWP)/ cardiac output
PAO2 =   (PB - PH2O)FIO2 - PaCO2/.8 or PaCO2 x 1.25
CaO2 =   (Hb x 1.34 x SaO2) + (PaO2 x .003)
Oxygen in RBC   (Hb x 1.34 x SaO2)
Oxygen in plasma   (PaO2 x .003)
CvO2 =   (Hb x 1.34 x SvO2) + (PvO2 x .003)
C(a-v)O2 =   CaO2 - CvO2
QT =   VO2/c(a-v)O2 (10)
VO2 =   QT x C(a-v)O2 x 10
SaO2 =   PaO2 + 30
VD/VT =   PaCO2 - PECO2/PaCO2 x 100
Clarks rule for drug dose ESD =   wt(lb.) x normal adult dose/150
Drug % x 10 x ml =   number of mg of drug
Alveolar ventilation (VA) =   (VT - VD) f
dynamic compliance =   exhaled volume/peak inspiratory pressure - PEEP
static compliance =   exhaled volume/plateau pressure - PEEP
RAW =   peak pressure - plateau pressure
Duration of flow (in minutes) =   gauge pressure (psi) x tank factor/liter flow
E cylinder =   .28 L/psi (0.3)
H cylinder =   3.14 L/psi (3.0)
Air to oxygen ratio FIO2 24   25:1 factor 26
Air to oxygen ratio FIO2 28   10:1 factor 11
Air to oxygen ratio FIO2 32   6:1 factor 7
Air to oxygen ratio FIO2 35   4.6:1 factor 5.6
Air to oxygen ratio FIO2 36   4:1 factor 5
Air to oxygen ratio FIO2 40   3:1 factor 4
Air to oxygen ratio FIO2 60   1:1 factor 2
Air to oxygen ratio FIO2 70   .6:1 factor 1.6
Air to oxygen ratio FIO2 100   0:1 factor 1
Total flow =   factor x liter flow

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Created by: kaczenskis on 2010-11-07