| SCS | Saethre-Chotzen syndrome; shared computer system; silicon-controlled switch; Society of Clinical Sur... |
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| SIS | semantic indexing system; serotinin irritation syndrome; simian sarcoma; simulator-induced syndrome;... |
| SMAS | submuscular aponeurotic system; superficial musculo-aponeurotic system; superior mesenteric artery s... |
| A2 | Aortic Component of the Second Heart Sound(S2) |
| CDH | 1) Chronic Daily Headache = CTH = ... |
| heart valve | <anatomy> A term used to describe anyone of the main 4 valves of the heart: tricuspid, mitral, aortic or pulmonic valves. Mitral valve separates left atrium and left ventricle, pulmonic valve separates pulmonary vein and left atrium, tricuspid valve separates right atrium and right ventricle, aortic valve separates left ventricle and the aorta (27 Sep 1997) |
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| heart valve prolapse | Displacement of the valves of the heart. (12 Dec 1998) |
| heart valve prosthesis | An artificial substitute for a heart valve. It may be mechanical or composed of tissue. (12 Dec 1998) |
| heart valve prosthesis implantation | Surgical insertion of synthetic material to repair injured or diseased heart valves. (12 Dec 1998) |
| heart valves | Flaps of tissue that prevent regurgitation of blood from the ventricles to the atria or from the pulmonary arteries or aorta to the ventricles. (12 Dec 1998) |
| heart ventricle | The lower right and left chambers of the heart. The right pumps venous blood into the lungs and the left pumps oxygenated blood into the systemic arterial circulation. (12 Dec 1998) |
| heart-whole | 1. Having the heart or affections free; not in love. 2. With unbroken courage; undismayed. 3. Of a single and sincere heart. "If he keeps heart-whole towards his Master." (Bunyan) See: Whole. Source: Websters Dictionary (01 Mar 1998) |
| heart-wounded | Wounded to the heart with love or grief. Source: Websters Dictionary (01 Mar 1998) |
| pseudo-heart | <zoology> Any contractile vessel of invertebrates which is not of the nature of a real heart, especially one of those pertaining to the excretory system. Origin: Pseudo- + heart. Source: Websters Dictionary (01 Mar 1998) |
| second heart sound | The second sound heard on auscultation of the heart; signifies the beginning of diastole and is due to closure of the semilunar valves. Synonym: second sound. (05 Mar 2000) |
| holiday heart syndrome | <syndrome> Arrhythmias of the heart, sometimes apparent after a vacation or weekend away from work, following excessive alcohol consumption; usually transient. (05 Mar 2000) |
| Holmes heart | A variant of double inlet left ventricle where the ventricular-arterial connection is concordant and the right ventricle is rudimentary. Horizontal heart, description of the heart's electrical position; recognised in the electrocardiogram when the QRS in lead aVL resembles that in V6 and QRS in aVF resembles that in V1; also, loosely, when the electrical axis lies between -30 |
| pulmonary heart | The right atrium and ventricle, receiving the venous blood and propelling it to the lungs. See: cor pulmonale. (05 Mar 2000) |
| pulmonary surface of heart | The lateral surface of the heart, directed toward the lungs; on the left it is principally the left ventricular wall; on the right it is the right atrial wall and the upper part of the right ventricular wall. Synonym: facies pulmonalis cordis. (05 Mar 2000) |
| semihorizontal heart | Loosely refers to the heart's electrical axis when this is directed at approximately 0 |