Doppler velocity detector, basic terms related to cardiac function, hemodynamics

3 Pages

Biomedical Science
Course Code
BMS 420
Charles Miller

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24 August EF = ejection fraction Doppler Velocity Detector Demonstration in class of use of Doppler velocity detector to measure blood velocity in artery and vein Artery: Velocity is pulsatile and related to heart contraction; variable depending on location Vein: Velocity is intermittent and not related to heart contraction because of damping by arterioles Vein valves break up column of blood and hydrostatic pressure Basic Terms Related to Cardiac Function Cardiac output: stroke volume x heart rate Stroke volume: end-diastolic volume – end-systolic volume End-diastolic volume: amount of blood in chambers at the end of filling stage End-systolic volume: amount of blood in chambers after ejection End-diastolic pressure: pressure in ventricle at end of diastole End-systolic pressure: pressure in ventricle at end of systole strokevolume EDV−ESV Ejection fraction: enddiastolicvolume = EDV Cardiac performance measured with cardiac output Preload: blood volume in heart at end of diastole Afterload: pressure ventricle pumps against to eject blood (80 mm Hg for systemic circulation) Contractility: force of contraction of heart which is independent of
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