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Hemodynamics Basic

Respiratory

QuestionAnswer
The factors that control blood pressure The Heart, Blood/Fluid & Vessels
The amount of blood pumped out of the left ventricle in a minute Cardiac Output
Cardiac Output normal range 4-8 LPM
Formula for Cardiac Output CO= HR X SV (Must be in liters)
Volume or amount of blood ejected with each beat Stroke Volume
Stroke Volume Normal range 60-130 mL/Beat
Formula for stroke volume SV= CO / HR (answer in mL)
Amount ejected from heart depends on 3 things Preload, Afterload & Contractility
Amount of stretch on Ventricle at filling before contraction (End Diastole) Preload
Resistance to ventricular emptying Afterload
RV pumps against PVR (Pulmonary vascular resistance)
LV pumps against SVR (Systemic Vascular Resistance)
Relates to the amount of stretching of the heart. Starlings Law
What happens to contraction of the heart with increased stretching stronger contraction which will increase cardiac output.
Volume of blood returning to the right atrium Venous Return
Used to describe flow output taking into consideration body size. Cardiac Index
Formula for Cardiac Index QT/BSA =CI
Cardiac Index Normal range 2.5-4.0 L/min/m2
BSA Formula (4 X KG) +7 / Kg +90
Numbers that represent the afterload for each of the ventricles PVR & SVR
PVR Formula (MPAP-PCWP)/CO X 80
NORMAL RANGE FOR PVR <200 DYNES/SEC/CM5 OR <2 UNITS
SVR CALCULATION MAP-CVP/CO X80
NORMAL RANGE FOR SVR 800-1500 DYNES OR 15-20 UNITS
AVERAGE OF THE PRESSURES PUSHING BLOOD THROUGH THE SYSTEMIC CIRCULATION. INDICATOR OF TISSUE PERFUSION MAP
MAP FORMULA SYSTOLIC BP + (DIASTOLIC BP X2) / 3
NORMAL MAP RANGES 80-100mmHg
DIFFERENCE BETWEEN SYSTOLIC AND DIASTOLIC PRESSURE PULSE PRESSURE
This happens when BP is too low tissues wont recieve O2
This happens when BP is too high Strain the heart and will eventually cause failure
The pump that creates BP Heart
INCREASED HR OR STRENGTH OF CONTRACTION INCREASE BP
Created by: mandy0630