Echocardiography
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Echocardiography
Force–velocity curves depict the effect of afterload on velocity of contraction of cardiac muscle. A, When the force of contraction is higher (i.e., when the muscle contracts against higher afterload), velocity of shortening is reduced. Velocity is highest (Vm) at zero afterload. Increased preload shifts the curve upward, but Vm, a measure of contractility, is unchanged. B, Positive inotropic influences such as sympathetic stimulation change Vm. The force–velocity curve is shifted upward.

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  This Illustration was Published In
Netter's Essential Physiology
Netter's Essential Physiology
Author: Susan E. Mulroney, Adam K. Myers
Chapter: The Cardiac Pump
Page: 120
 
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