# Anesthesia Equations – Flashcards

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