CRNA Boards Exam with Complete Solutions 100% Solved
CRNA Boards Exam with Complete Solutions 100% Solved How much does the PaO2 decrease as we age? ️️PaO2 = 100 - (0.3 x age) An increased shunt (as seen with eldery) will further decrease PaO2 Oxygen delivery equation ️️DO2 = CO x CaO2 x 10 = 20mL/dL x 5L/min x 10) = 1000mL/min Oxygen carrying capacity of blood ️️• When 100% saturated, 1 gram hemoglobin carries 1.34 mL oxygen • CaO2 = (1.34 x hgb x SaO2) + (PaO2 x 0.003) = 20ml/dL Calculate Bicarb Deficit ️️Kg x 0.3 x Base Excess or (Desired bicard - measured bicarb). Divide by 2 for first dose CO2 production per minute ️️200ml CO2/min 200ml CO2/250 ml O2 per min = 0.8 - This is the respiratory quotient used in the alveolar gas equation oxygen consumption equation ️️VO2 = CO x (CaO2 - CvO2) VO2 = 3.5 ml/kg/min VO2 = ~250 ml/min or (FiO2I - FiO2E) x Mv = ml of O2 required Alveolar Gas Equation (PAO2) ️️- PAO2 = FiO2 x (Pb - PH2O) - (PaCO2/0.8) - Subtract given A-a gradient to get expected PaO2 (arterial)
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