| isovolumetric | Occurring without an associated alteration in volume, as when, in early ventricular systole, the muscle fibres initially increase their tension without shortening so that ventricular volume remains unaltered. See: isometric. Synonym: isochoric, isovolumetric. (05 Mar 2000) |
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| isovolumetric relaxation | That part of the cardiac cycle between the time of aortic valve closure and mitral opening, during which the ventricular muscle decreases its tension without lengthening so that ventricular volume remains unaltered; the heart is never precisely isovolumetric (vs. Isovolumic) except during long diastoles with a midiastolic period of diastasis. Synonym: isovolumetric relaxation. (05 Mar 2000) |