Anesthesia Equations – Flashcards
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Mean Arterial Pressure
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MAP= DBP + (pulse pressure/3)
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Cardiac Output
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CO= SV x HR
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Normal CO value
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4-8 L/min
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Cardiac Index
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CI= CO/BSA
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Normal CI value
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2.5-4.2 L/min/m^2
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Ejection Fraction
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EF= EDV-ESV/EDV
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Arterial Oxygen content
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CaO2= (SaO2 x Hb x 1.34) + (PaO2 x 0.003)
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Systemic Vascular Resistance
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SVR= 80 x (MAP - CVP)/CO
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Normal SVR value
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900-1500 dyne/sec/cm^5
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Systemic Vascular Resistance Index
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SVRI= SVR x BSA
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Pulmonay Vascular Resistance
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PVR= 80 x (mean PAP - PWP)/CO
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Normal PVR value
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50-150 dyne/sec/cm^5
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Pulmonay Vascular Resistance Index
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PVRI= PVR x BSA
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Max Allowable Blood Loss
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MABL= EBV x (Hct - min acceptable hct)/Hct
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Fractional Excretion of Na
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FeNa= (Urinary Na x Plasma Cr)/(Urinary Cr x Plasma Na) x 100
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FeNa Value
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Prerenal- 1%; Postrenal- >4%
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Oxygen Consumption
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Vo2 = 10 (weight in kg)^3/4
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LaPlace's Law
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Pressure = 2 x surface tension/radius
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Equation for Laminar Flow
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Flow = Pressure gradient/airway resistance
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Pouiseilles Law for airway resistance
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Airway resistance = (8 x viscosity x Length of tube x volumetric flow rate)/ (pi x r^4)
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Minute Ventilation
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MV = RR/Vt [L/min]
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Inspired Tension of Oxygen
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PiO2 = Pb x FiO2
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Alveolar Oxygen Tension
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PAO2 = PiO2 - (PaCO2/Rq)
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Approximating Arterial Oxygen Tension
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PaO2 = 102 - (Age/3)
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Henry's Law (for calculating dissolved O2 in blood)
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Gas Concentration = gas solubility coefficient x partial pressure
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Total Oxygen delivery
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DO2 = CaO2 x Qt [mL O2/min]
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Fick Equation (relationship between O2 consumption, O2 content, and CO)
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VO2 = Qt x (CaO2-CvO2)
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Cerebral Perfusion Pressure
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CPP = MAP - ICP
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Normal Cerebral metabolic Oxygen consumption (CMRO2) value
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3-3.8 mL/100g/min
