It relates the Systole and the area of an arbitrary Riemannian metric on the 2-torus.
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The period of contraction that the heart
undergoes while it pumps blood into circulation is called Systole.
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This is usually a harsh murmur that is uniform throughout Systole right up to the normally split S2.
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The input is given by the"cardiac pump",
during the left ventricular Systole, at the end of which the support of the elastic return of the arteries intervenes.
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The murmur tends to be throughout Systole but, if the defect is in the muscular portion,
it may be shorter as the hole is closed as the muscle contracts.