Ventricular preload

Ventricular preload is not a molecule, protein, receptor, enzyme, or any therapeutic molecular target; rather, it is a physiological parameter describing the degree of stretch of the ventricular myocardial fibers at the end of diastole, just before contraction begins[1][3][9]. It reflects the volume of blood filling the ventricle and is clinically estimated by measures such as ventricular end-diastolic pressure or volume[1][3][6][9]. Preload has a major influence on cardiac stroke volume through the Frank–Starling mechanism[1][9]. While it is a critical determinant of cardiac function, preload itself cannot be targeted directly—though some drugs (like diuretics, nitrates, or ACE inhibitors) affect cardiac preload, these drugs do not bind a specific "preload molecule" or receptor, but rather alter hemodynamics. Commonly, brain natriuretic peptide (BNP) is used as a biomarker for ventricular strain and elevated preload[5]. In summary, "ventricular preload" is a physiological concept, not a molecular target, and thus most structured fields above are not applicable.

Other names

Cardiac preloadLeft ventricular preloadRight ventricular preload

Ventricular preload is a physiological concept, not a molecular target. Drugs that affect preload (e.g., diuretics, nitrates, ACE inhibitors) do so by altering hemodynamics (e.g., reducing blood volume, causing vasodilation), rather than binding to a specific 'preload molecule' or receptor.