Glossary of Medical Terms

Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine

VENTRICULAR AFTERLOAD

Formerly, the arterial pressure or some another measure of the force that a ventricle should overcome while it contracts during ejection, contributed to by aortic or pulmonic artery impedance, peripheral vascular resistance, and mass and viscosity of blood; now, more rigorously expressed in terms of the wall stress, i.e., the tension for unit cross-sectional area in the ventricular muscle fibres (calculated by an expansion of Laplace's law utilizing pressure, inside radius, and wall thickness) that is required to manufacture the intracavitary pressure required during ejection.
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