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A comprehensive overview of the key equations and formulas used in anesthesia practice, including calculations for serum osmolarity, minute ventilation, alveolar ventilation, ohm's law, poiseuille's law, cardiac output, cardiac index, stroke volume, stroke volume index, ejection fraction, systemic vascular resistance, pulmonary vascular resistance, and coronary blood flow. The mathematical expressions, variables, and normal ranges for these important physiological parameters, making it a valuable resource for anesthesia students, practitioners, and researchers. By understanding these fundamental equations, healthcare professionals can better interpret patient data, optimize treatment strategies, and ensure safe and effective anesthesia management.
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Serum Osmolarity - \Serum Osmolarity = 2[Na+] + (glucose/18) + (BUN/2.8) Minute Ventilation - \VE = Vt x RR Alveolar Ventilation - \VA = (Vt - Vd) x RR Bohr Equation - \EtCO2 can be used instead of PeCO Ohm's Law - \Flow = Pressure Gradient / Resistance or CO = (MAP - CVP) / SVR Poiseuille's Law -
MAP Equation -
Cardiac Output Equation - \CO = HR x SV 5-6 L/min Cardiac Index - \CI = CO/BSA [2.8-4.2 L/min/m^2] Stroke Volume Equations - \SV = EDV - ESV SV = CO x 1000 / HR 50-110 ml/beat
Stroke Volume Index - \SVI = SV / BSA 30-65 ml/beat/m^ Ejection Fraction Equation - \EF = (EDV - ESV) / EDV x 100 EF = SV / EDV x 100 60-70% Systemic Vascular Resistance Equation - \SVR = (MAP - CVP) / CO x 80 900-1400 dynes Systemic Vascular Resistance Index - \SVR = (MAP - CVP) / CI x 80 1500-2400 dynes Pulmonary Vascular Resistance Equation - \PVR = (MPAP - PAOP) / CO x 80 150-250 dynes Pulmonary Vascular Resistance Index - \PVI = (MPAP - PAOP) / CI x 80 250-400 dynes Wall Stress - \Wall Stress = Intraventricular Pressure x Radius / Wall Thickness Coronary blood flow equation. - \Coronary perfusion pressure / coronary vascular resistance Coronary Perfusion Pressure - \CPP = DBP - PAOP