Occurring without an associated alteration in volume, as when, in early ventricular systole, the muscle fibers initially increase their tension without shortening so that ventricular volume remains unaltered. SEE ALSO: isometric. SYN: isochoric, isovolumetric.
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iso·vo·lu·mic (i″so-və-looґmik) [iso- + volume] maintaining the same volume.Medical dictionary. 2011.