= Ventricular elastance
{title2=$p_{LV}=E_{LV}(t)(V_{LV}-V_0)$}
Time-dependent elastance models the <pressure> generated by a <cardiac ventricle> at its current stressed volume. The reference $V_0$ is its zero-<pressure> volume. The inverse of elastance is compliance at fixed time. Rising elastance increases <pressure> without volume change during <isovolumetric contraction>; an approximately constant systolic value $E_S$ gives compliance $C_s=1/E_S$ during a simplified ejection stage.
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