# Calculations

BSA and other weight formulas
Mosteller Formula BSA = ((cm*kg)/3600)^0.5
Dubois Formula BSA = ((kg^0.425)*(cm^0.725)) * 0.007184
Streczyn BSA = ((4*kg)+7) / (kg+90)
Body Mass Index BMI = ((lb / 2.2) / (in/39.4))^2
Ideal Body Weight (female) IBW = ((in - 58) * 5) + 90
Ideal Body Weight (male) IBW = ((in - 58) * 6) + 94
Blood Formulas
Allen Method BV = ((.416 * ((in * .0254)3) + 0.039 * (lb*.4536)) -.03)
Estimated Blood Volume by Weight EBV = Weight (kg) x Average Blood Volume (mL/kg)
Male Average BV = 70 mL/kg Female Average BV = 65 mL/kg
Estimated Hematocrit HCTestimated = (BV * HCTpre) / (BV+PV+CCPS+ANES-URINE)
Oxygen Calculations
Oxygen Capacity (1.34 x Hgb) + (.003 x pO2)
Arterial Oxygen Content CaO2 = (1.34 x Hgb x SaO2) + (.003 x pO2)
Venous Oxygen Content CvO2 = (1.34 x Hgb x SvO2) + (.003 x pO2)
Oxygen Consumption VO2 = CaO2 - CvO2 x Q x 10
Oxygen Transfer (1.34 x Hgb x (SaO2 - SvO2) x Q x 10
Hemodynamic Calculations
Cardiac Output HR x SV
Stroke Volume SV = CO / HR or SV = EDV - ESV
Cardiac Index CI = CO / BSA
Ejection Fraction EF = SV / EDV
Gas:Blood Ratio Gas Flow = G:B x Q
Mean Arterial Pressure MAP = [systolic + (diastolic x 2)] / 3
Systemic Vascular Resistance SVR = [(MAP-CVP)/CO] x 80
Normal SVR = 800 - 1200 dynes/sec/cm^-5
Pulmonary Vascular Resistance PVR = [(PAP-PAWP)/CO] x 80
Normal PVR = 250 - 350 dynes/sec/cm^-5
Stroke Work Index SWI = (CO/BSA) / HR x 1000
Normal SWI = 36-49mL/m2/beat
Left Ventricular Stroke Work Index LVSWI = SWI x MAP x 0.0136
Normal LVSWI = 50-62