| RV | random variable; rat virus; Rauscher virus; rectovaginal; reinforcement value; renal vein; residual ... |
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| RVA | re-entrant ventricular arrhythmia; right ventricle activation; right vertebral artery |
| RVEF | right ventricular ejection fraction; right ventricular end-flow |
| RVF | renal vascular failure; Rift Valley fever; right ventricular failure; right visual field |
| RVG | right ventral glutens [muscle]; right visceral ganglion |
| parchment heart | A congenital or acquired condition in which there is thinning of the right ventricular myocardium. Synonym: right ventricular hypoplasia. (05 Mar 2000) |
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| vertical heart | Loosely descriptive of the heart's electrical axis when this is directed at approximately +90 |
| partial heart block | Impulses penetrate the atrioventricular junction in some relation to the ventricular rate. Synonym: incomplete atrioventricular block. (05 Mar 2000) |
| mechanical alternation of the heart | A disorder in which contractions of the heart are regular but are alternately stronger and weaker. (05 Mar 2000) |
| mechanical heart | Term loosely applied to any mechanical circulatory assist device. (05 Mar 2000) |
| globular heart | Abnormally smooth arcuate contours of the heart due either to disease of the ventricles or to a false cardiac appearance produced by excessive pericardial fluid. Synonym: globular heart. (05 Mar 2000) |
| vortex of heart | A spiral arrangement of muscular fibres at the apex of the heart. Synonym: vortex cordis, whorl. (05 Mar 2000) |
| pendulous heart | An extreme form of cor mobile in which the heart appears to be suspended by the great vessels. Synonym: pendulous heart. (05 Mar 2000) |
| chaotic heart | Apparently totally uncoordinated cardiac action or rhythm. (05 Mar 2000) |
| rheumatic heart disease | The most important manifestation of and sequel to rheumatic fever, i.e., any cardiac involvement in rheumatic fever. (12 Dec 1998) |
| rheumatism of the heart | Rheumatic cardiac valvular disease, most often of the mitral and aortic valves. (05 Mar 2000) |
| chick heart fibroblast | <cell culture> The cells that emigrate from an explant of embryonic chick heart maintained in culture. Often used as archetypal normal cell. (05 Jan 1998) |
| round heart | Abnormally smooth arcuate contours of the heart due either to disease of the ventricles or to a false cardiac appearance produced by excessive pericardial fluid. Synonym: globular heart. (05 Mar 2000) |
| round heart disease | A spontaneous cardiomyopathy of unknown aetiology that affects young turkeys; characterised by sudden death due to cardiac arrest. (05 Mar 2000) |
| mitochondria, heart | The mitochondria of the myocardium. (12 Dec 1998) |