Heart Sounds


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Heart Sounds
Heart SoundsFigure 2.19 also shows heart sounds associated with events during the cardiac cycle. Heart sound S1 is the "lub" associated with the closing of the AV valves. Heart sound S2 is the "dub" associated with the closing of the semilunar valves. Heart sounds are relatively low pitched. Most are between 10 and 500 Hz, and of a relatively low intensity. Some components of sounds S1 and S2 are produced by blood movement between atria and ventricles, by vibration of the ventricular walls, and even by vibration of the base of the aorta and pulmonary arteries. A third, less distinct heart sound may occur shortly after the opening of the AV v…
Citation
Lee Waite, Ph.D., P.E.; Jerry Fine, Ph.D.: Applied Biofluid Mechanics, Second Edition. Heart Sounds, Chapter (McGraw-Hill Professional, 2017), AccessEngineering Export