| tobacco heart | Cardiac irritability marked by irregular action, palpitation, and sometimes pain, believed to occur as a result of the excessive use of tobacco. (05 Mar 2000) |
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| ergot alkaloid-associated heart disease | Heart disease caused by endomyocardial fibrosis which extends into valve structures, producing stenosis and/or regurgitation, associated with ergot alkaloid use. (05 Mar 2000) |
| Jarvik artificial heart | A pneumatic artificial heart. (05 Mar 2000) |
| eyeball-heart reflex | Slowing of the heart rate due to the vagal effects of compressing an eyeball. Synonym: eyeball compression reflex. (05 Mar 2000) |
| false-heart | Hollow or unsound at the core; treacherous; deceitful; perfidious. Source: Websters Dictionary (01 Mar 1998) |
| fatty heart | Fatty degeneration of the myocardium, accumulation of adipose tissue on the external surface of the heart with occasional infiltration of fat between the muscle bundles of the heart wall. Synonym: cor adiposum. (05 Mar 2000) |
| univentricular heart | An anomaly in which all blood flows through one ventricle or in which the arterioventricular valves are committed to empty into only one chamber in the ventricular mass. (05 Mar 2000) |
| fibrous ring of heart | One of four fibrous rings that surround atrioventricular and arterial orifices of the heart, providing attachment for the valve leaflets and maintaining patency of the orifice. As part of the fibrous skeleton of the heart, the fibrous rings also provide origin and insertion for the myocardium. Synonym: annulus fibrosus cordis, annulus fibrosus, coronary tendon, fibrous ring, Lower's ring. (05 Mar 2000) |
| fibrous skeleton of heart | A complex framework of dense collagen forming four fibrous rings (annuli fibrosi), which surround the ostia of the valves, a right and left fibrous trigone, formed by connecting the rings, and the membranous portions of the interatrial and interventricular septa; it is found in association with the base of the ventricles, i.e., at the level of the coronary sulcus; its functions include: 1) contributing reinforcement of the valvular ostia while providing attachment for the leaflets and cusps of the valves; 2) providing origin and insertion for the myocardium; and 3) serving as a sort of electrical "insulator," separating the electrically conducted impulses of the atria and ventricles and providing passage for the common atrioventricular bundle of conductive tissue through the right fibrous trigone and membranous interventricular septum. Synonym: cardiac fibrous skeleton, cardiac skeleton, skeleton of heart. (05 Mar 2000) |
| fibrous trigones of heart | See: right fibrous trigone, left fibrous trigone. (05 Mar 2000) |
| first heart sound | Occurs with ventricular systole and is mainly produced by closure of the atrioventricular valves. (05 Mar 2000) |
| foetal heart | The heart of the foetus of any viviparous animal. It refers to the heart in the postembryonic period and is differentiated from the embryonic heart (heart/embryology) only on the basis of time. (12 Dec 1998) |
| foetal heart rate | In the foetus, the number of heart beats per minute, normally 120 to 160. (05 Mar 2000) |
| foramina of the smallest veins of heart | <anatomy> A number of fossae in the wall of the right atrium, containing the openings of minute intramural veins. Synonym: foramina venarum minimarum cordis, foramina of the smallest veins of heart, Lannelongue's foramina, thebesian foramina, Vieussens' foramina. (05 Mar 2000) |
| fourth heart sound | The sound produced in late diastole in association with ventricular filling due to atrial systole and related to reduced ventricular compliance. It is a low frequency oscillation that may be normal at older ages owing to a physiologic decline in ventricular compliance but is nearly always abnormal at younger ages if it is of high intensity or palpable. It is common in ventricular hypertrophy, particularly with hypertension, and is almost invariable during acute myocardial infarction. Fourth heart sounds may arise from the right or left ventricle or both. Synonym: atrial sound. (05 Mar 2000) |