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20 Cards in this Set
- Front
- Back
Velocity of blood flow =
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flow/ cross-sectional area
v= Q/A Q = flow (ml/sec) A = πr 2 |
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Relationships between blood flow,
pressure, and resistance? |
Q = ΔP/R
where, Q = flow (ml/sec) ΔP = pressure difference (mmHg) R = resistance (mmHg/mL/min) |
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Calculate Resistance (standard equations)
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R = ΔP/Q
Pressure/Flow |
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Calculate Resistance using Poiseuille’s Equation
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resistance=
(8)(viscosity of blood)(length of the blood vessel) _______________________ (3.14) r 4 Can be simplified as 1/r 4 |
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Formula for Series Resistance
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R total = R artery + R arteriole + R capillary + R venule + R vein
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Formula for parallel Resistance
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1/R total = 1/R artery +1/ R arteriole + 1/R capillary + 1/R venule + 1/R vein
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What is Reynolds number and what is the equation?
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a dimensionless number that predicts turbulent or laminar flow
(density of blood)(diameter of vessel)(velocity of flow) (/ -DIVIDED BY) viscosity of blood |
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What is the Vessel Compliance Equation?
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compliance(ml/mmHg)=
V = volume (ml)/P = pressure (mmHg) |
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Duration of the cardiac cycle (formula)
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Time for one pump.
60 (sec/min) ÷÷ heart rate (beats/min) |
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Stroke Volume
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End diastolic volume – end systolic volume
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Ejection fraction:
What is it? What's the Equation: |
Fraction of the EDV that is ejected in one SV
(Stroke Volume/End Diastolic Volume) X 100% |
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What is Cardiac output?
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Total volume of blood ejected per unit time
(stroke volume) X (heart rate) |
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What is Cardiac index?
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The cardiac output normalized for body surface area
CI = CO ÷÷ SA |
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Left ventricular stroke work Equation LVSW (2)
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SV x left ventricular pulse pressure
SV x Mean Arterial Pressure |
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How do you measure isovolumic indices?
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can get rate of ventricular P changes during isovolumiccontraction (+dP/dt) with catheterization
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Mean Arterial Pressure Equation
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diastolic pressure + 1/3(pulse pressure)
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Left Ventricular minute work (LVMW) equation actual and estimated...
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LVSW x HR
or SV x MAP x HR |
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Fick method for calculating cardiac output
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O2Consumption
_____________ (arterial O2)- (venous O2) |
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Calculate TPR...
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Can use equation
(Mean Arterial Pressure - Mean Venous Pressure) / Cardiac Output or (ΔP = MAP – WEDGE/COutput) or (ΔP = MAP – RAP) |
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Pulmonary capillary wedge pressure is approximately equal to what other value?
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left atrial pressure
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