| FSS | focal segmental sclerosis; Freeman-Sheldon syndrome; French steel sound |
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| Lp | lipoprotein; sound pressure level |
| LSD | laryngeal sound discrimination; least significant difference; least significant digit; low-sodium di... |
| LSV | lateral sacral vein; left subclavian vein; longitudinal sound velocity |
| M1 | mitral first [sound]; myeloblast; slight dullness |
| movable heart | A heart that moves unduly on change of bodily position. Synonym: movable heart. (05 Mar 2000) |
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| 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) |
| congestive heart failure | A condition where there is ineffective pumping of the heart leading to an accumulation of fluid in the lungs. Typical symptoms include shortness of breath with exertion, difficulty breathing when lying flat and leg or ankle swelling. Causes include chronic hypertension, cardiomyopathy and myocardial infarction. (27 Sep 1997) |
| muscle of heart | muscle |
| muscular part of interventricular septum of heart | The thick muscular portion which comprises most of the interventricular septum of the heart. Synonym: pars muscularis septi interventricularis cordis, septum musculare ventriculorum. (05 Mar 2000) |
| myocytolysis of heart | Local loss of myocardial syncytium as a result of a metabolic imbalance, insufficient in intensity or duration (or both) to cause stromal injury or to elicit any reactive exudation. (05 Mar 2000) |
| myxoedema heart | The enlarged heart associated with untreated severe hypothyroidism, often accompanied by pericardial effusion; rare in modern medicine. (05 Mar 2000) |
| crisscross heart | Cardiac malformation characterised by an atrioventricular spatial relation that places or appears to place each ventricle in a contralateral position relative to its associated atrium. (12 Dec 1998) |
| crux of heart | The zone of junction of the septa and walls of the four chambers of the heart. Synonym: cross. (05 Mar 2000) |
| hairy heart | Acute pericarditis with fibrinous exudate. See: bread-and-butter pericardium. Synonym: hairy heart, pericarditis villosa, shaggy pericardium. (05 Mar 2000) |
| premature contraction of the heart | When a single heartbeat occurs earlier than normal. This phenomenon can be within normal limits or represent a medically significant arrhythmia. (12 Dec 1998) |