| 释义 |
ventricular afterload ven·tric·u·lar af·ter·loadformerly and erroneously, the arterial pressure or some other measure of the force that a ventricle must 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, that is, the tension per unit cross-sectional area in the ventricular muscle fibers (calculated by an expansion of Laplace law using pressure, internal radius, and wall thickness) that is required to produce the intracavitary pressure required during ejection.ven·tric·u·lar af·ter·load (ven-trik'yū-lăr af'tĕr-lōd) The sum total of the forces, both hemodynamic and mechanical, which the left ventricle of the heart must pump against to send oxygenated blood out into the body. |