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Basic Hemodynamic

Basic Hemodynamic Formulas

QuestionAnswer
O2 Capacity Formula Hemoglobin X 1.36
Oxygen Content O2 Capacity X O2 Saturation
Hemoglobin x 1.36 O2 Capacity
O2 Capacity x O2 Saturation Oxygen Content
AVO2 Difference (AO sat X 1.36 X hemoglobin) - (PA sat X 1.36 X hemoglobin)
(AO sat X 1.36 X Hemoglobin) - (PA sat X 1.36 X hemoglobin) AVO2 Difference
Fick Cardiac Output (L/min) O2 consumption (ml/min) DIVIDED BY AVO2 difference X 10 O2 consumption ml/min DIVIDED BY AVO2 Content difference MULTIPLIED BY 10
For the Fick CO what do you need to multiply the AVO2 by to convert from ml/min to L/min? 10
O2 consumption range 220-290. 250 is considered the average.
Cardiac Index Formula CO/BSA
Cardiac Output DIVIDED BY the Body Surface Area equals .... Cardiac Index. The lower the # the sicker the patient.
Body Surface Area Formula Height X Weight X Hemoglobin
Stroke Volume is what? Amount of blood pumped by the left ventricle of the heart in one contraction
Stroke Volume (SV) Formula Cardiac Output X 1000 DIVIDED BY Heart Rate SV=CO X 1000 / HR
CO X 1000 / HR Stroke Volume
Pulse Pressure The difference between the systolic # and the diastolic #
MAP (Mean Arterial Pressure) Aortic Systole MINUS Aortic Diastole multiplied by 1/3 PLUS the Aortic DIASTOLE
Aortic Pulse Pressure X .33 + Diastole= MAP (Mean Arterial Pressure)
MPA (Mean Pulmonary Artery Pressure) Pulmonic Systole MINUS Pulmonic Diastole MULTIPLIED BY 1/3 PLUS Pulmonic Diastole
Pulmonic Pulse Pressure X .33 + pulmonic Diastole = MPA (Mean Pulmonary Artery Pressure)
Why is the Hakkai Formula used For quick approximation only of the valve area
Hakkai Formula Valve Area = CO / Square Root of the mean gradient (aortic or mitral)
Cardiac Output DIVIDED by the Square Root of the mean gradient (aortic or mitral) Hakkai Formula for Valve Area
Created by: CVTMom