Term
| what are some functions of the cardiovascular system? |
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Definition
| the delivery of hormones, temperature regulation, immune function, delivery of O2 and nutrients |
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Term
| what is mean arterial pressure? |
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Definition
the diastolic pressure + 1/3 the pulse pressure (systolic minus diastolic)
ex. for BP of 120/80, MAP = 93 |
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Term
| define flow and how is it calculated? |
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Definition
volume / time
Q = delta P / R |
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Term
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Definition
| heart rate x stroke volume |
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Term
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Definition
the cardiac output adjusted for body surface area
CO / m^2 |
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Term
|
Definition
stroke volume adjusted for body surface area
SV / m^2 |
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Term
| what is the normal resting cardiac output for 150 lb male? |
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Definition
5 L / min
70 bpm at 70 ml stroke volume |
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Term
| describe the conduction pathway in the heart. |
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Definition
| SA node, AV node, HIS-purkinje system, and ventricular myocardium |
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Term
| true or false, cardiac output for each ventricle is the same. |
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Definition
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Term
| what controls the flow to a region of the body? |
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Definition
| the resistance in the vessels to that region |
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Term
| which regions of the body receive the most/least cardiac output? |
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Definition
kidney, GI, skeletal muscle, and brain receive most
heart muscle, bone, and skin receive least |
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Term
| what region of the cardiovascular system has the highest pulse pressure? |
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Definition
the left ventricle
120 / 0 |
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Term
what is a pulmonary artery catheter used for?
also called swan ganz catheter |
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Definition
| to measure pressure in the RA, RV, PA and LA pressures, as well as cardiac output |
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Term
| how is left atrial pressure determined? |
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Definition
| a catheter is inserted into the pulmonary artery, then a balloon is filled to restrict blood flow past the balloon, the down stream pressure normalizes, and that pressure is measured giving the LA pressure |
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Term
| describe the indicator dilution method and what does it measure? |
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Definition
a dye is injected into the pulmonary arteries, the concentration of the dye is recorded along with the duration which is extrapolated due to recycling of the dye,
cardiac output is measured via
total dye injected / (mean dye concentration) (time) |
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Term
| what is the fick principle and what does it measure? |
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Definition
measures cardiac output via blood O2 concentrations of pulmonary veins and arteries compared to O2 consumption, able to determine how much blood flows through the lungs
CO = O2 cons. / [art. - vein]o2 |
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Term
| name some other methods for measuring blood flow. |
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Definition
occlusion plethysmograph
doppler flowmeter
electromagnetic flowmeter |
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