the result electronic stethoscope in oscilloscope.we test and find the waveform from circuit electronic stethoscope project. we get waveform and compare the theory waveform heart sound in the book.
the theory heart sound divide into cardiac with S1, S2, S3 and S4.
theory heart sound picture
first heart sound (S1)
-produced by closing effect of tricuspid and mitral valves. at the beginning of ventricular systolic.
-heart tone S1, forms the "lub" of "lub-dub"
second heart sound (S2)
-represents the vibrations as a result from closure of semilunar valves beginning the aortic valves and pulmonary valve.
-heart tone S2, forms the "dub" of "lub-dub"
Extra heart sounds
third heart sound (S3)
- result of tensing of the chordae tendineae during rapid filling and expansion of the ventricle.
-heart tone S3, from the "lub-dub-ta" or "slosh-ing-in"
fourth heart sound (S4)
- produced by the sound of blood being forced into a stiff/hypertrophic ventricle.
-heart tone s4, from the "ta-lub-dub" or "a-stiff-wall"
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