| OD | Doctor of Optometry; obtained absorbance; occipital dysplasia; occupational dermatitis; occupational... |
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| OF | occipitofrontal; open field [test]; optical fundus; orbitofrontal; osmotic fragility; osteitis fibro... |
| OLIDS | open loop insulin delivery system |
| OMVC | open mitral valve commissurotomy |
| OPA | open procurement agency |
| right border of heart | The border between the sternocostal and diaphragmatic surfaces of the heart; it is fairly well defined in fixed hearts but is rounded and indefinite in the living heart. Synonym: margo dexter cordis, right margin of heart. (05 Mar 2000) |
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| right heart | The right atrium and right ventricle. (05 Mar 2000) |
| right heart bypass | Introduction of a circuit shunting blood from the venae cavae around the right atrium and ventricle and directly into the pulmonary artery. (05 Mar 2000) |
| right margin of heart | The border between the sternocostal and diaphragmatic surfaces of the heart; it is fairly well defined in fixed hearts but is rounded and indefinite in the living heart. Synonym: margo dexter cordis, right margin of heart. (05 Mar 2000) |
| 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) |
| white-heart | <botany> A somewhat heart-shaped cherry with a whitish skin. Source: Websters Dictionary (01 Mar 1998) |
| compensatory hypertrophy of the heart | Thickening of the walls of the heart in response to vascular, valvular, other heart disease, or athletic conditioning. (05 Mar 2000) |
| movable heart | A heart that moves unduly on change of bodily position. Synonym: movable heart. (05 Mar 2000) |
| compliance of heart | The reciprocal of passive or diastolic stiffness of the ventricle of the heart, most commonly of the left ventricle; one may distinguish between compliance of the muscle and compliance of the supportive structures, although ordinarily both are considered together (chamber compliance); a hypertrophied or scarred heart will manifest a stiff wall, i.e., decreased compliance. (05 Mar 2000) |
| conducting system of heart | The system of atypical cardiac muscle fibres comprising the sinoatrial node, internodal tracts, atrioventricular node and bundle, the bundle branches, and their terminal ramifications into the Purkinje network; sometimes also called cardionector. (05 Mar 2000) |
| wooden-shoe heart | <radiology> The radiographic configuration of the heart in the tetralogy of Fallot; the elevated apex gives a silhouette like that of a wooden shoe Synonym: sabot heart, wooden-shoe heart. (05 Mar 2000) |
| congenital heart block | Atrioventricular block present in utero or at birth and usually of advanced or complete degree. (05 Mar 2000) |
| congenital heart disease | Heart disease that is present from birth. Examples include atrial septal defect, ventricular septal defect, aortic stenosis and tetralogy of Fallot. (27 Sep 1997) |