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02-13-2004, 12:15 PM
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Calculations PHYSIOLOGY
Key Physiology Equations for USMLE Step I
Equation Name Equation Mean arterial pressure Pa = CO * TPR Resistance R = 8nl/hR4 Compliance C = V/P Cardiac output CO = SV*HR Cardiac output CO =O2 CONSUMPTION/O2 pv-O2 pa (measurement) Ejection fraction EF = SV/EDV Physiologic dead space VD = VT*(PACO2-PECO2)/PACO2 Alveolar ventilation VA = (VT - VD)* breaths/min Renal clearance C =Ux*V/Px GFR GFR =Uinulin/Pinulin* V Free water clearance CH2O = V˙ - Cosm Henderson-Hasselbalch pH = pK +logA-/HA equation Serum anion gap Anion gap = Na-(Cl + HCO3)     
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