ventricular preload

ven·tric·u·lar pre·load

formerly, the end-diastolic pressure stretching the ventricular walls, which determines the end-diastolic fiber length at the onset of ventricular contraction, or some other measure of this load on the muscle fibers before contraction; now, more rigorously expressed in terms of the wall stress at this moment, related to the tension per unit cross-sectional area in the ventricular muscle fibers (calculated by Laplace law from internal radius and pressure modified by wall thickness) that balances this transmural pressure at the moment before contraction begins.
Synonym(s): preload (2)
Farlex Partner Medical Dictionary © Farlex 2012

ven·tric·u·lar pre·load

(ven-trik'yū-lăr prē'lōd)
The pressure stretching the ventricular walls at the onset of ventricular contraction, expressed in terms of the wall stress at this moment, related to the tension per unit cross-sectional area in the ventricular muscle fibers that balances this transmural pressure at the moment before contraction begins.
Synonym(s): preload (2) .
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ven·tric·u·lar pre·load

(ven-trik'yū-lăr prē'lōd)
The pressure stretching the ventricular walls at the onset of ventricular contraction.
Synonym(s): preload (2) .
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Correlation among right ventricular preload, afterload and ejection fraction in mitral valve disease: Radionuclide, echocardiographic and hemodynamic evaluation.
The potential haemodynamic derangement associated with right ventricular infarction renders the patient's unusually sensitive to diminished ventricular preload. These two circumstances can result in a severe decrease in right and secondarily left ventricular output resulting in a clinical triad of hypotension and jugular venous pressure distension in the presence of clear lung fields.
One study showed that LV diastolic function may influence the increase in left ventricular preload as a result of CKD progression.
A comparison oftissue Doppler imaging and velocities of transmitral flow in childrenwith elevated left ventricular preload. Cardiol Young 2001;11:261-268.
The pneumoperitoneum-induced increases in abdominal pressure may compress the inferior vena cava, resulting in decreased right ventricular preload. Furthermore, increased inspiratory pressure has been shown to disturb venous return (26).
Venous return to the heart directly influences ventricular preload. Afterload refers to the stress imposed on the ventricle during systole.
As a result, left ventricular preload is decreased and cardiac output falls.
The decreased transmural pressure increases the intraluminal pressure, which "pushes" the blood from pulmonary vessels into the left ventricle and increases left ventricular preload. Therefore, stroke volume and systolic blood pressure increase.
However, these changes lead to a reduction in LV compliance affecting the early diastolic filling, making the left ventricular preload more dependent on atrial contraction.

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