| bicuspid aortic valve | See: familial aortic ectasia syndrome. (05 Mar 2000) |
|---|---|
| bicuspid valve | <anatomy, cardiology> The heart valve that divides the left atrium and left ventricle. During left atrial contraction, the mitral valve opens to allow blood to flow into the left ventricle. Upon closure, the mitral valve prohibits the regurgitation of blood back into the left atrium. The mitral valve is the only heart valve that has only 2 valve cusps (all others have 3). (13 Nov 1997) |
| bi-leaflet valve | A low profile mechanical heart valve that is less obstructive to outflow, especially in small size. (05 Mar 2000) |
| billowing mitral valve syndrome | <syndrome> The clinical constellation of findings with or without symptoms due to prolapse of the mitral valve: a nonejection systolic click accentuated in the standing posture, sometimes multiple, sometimes with mitral regurgitation occurring relatively late in systole, and accompanied by echocardiographic evidence of the mitral valve prolapse, usually with thickened leaflets of the valve. Symptoms are non-specific and may include vague chest pains and dyspnea on exertion. Synonym: billowing mitral valve syndrome. (05 Mar 2000) |
| Bjork-Shiley valve | A low profile tilting disc mechanical heart valve. (05 Mar 2000) |
| Bochdalek's valve | A fold of mucous membrane in the lacrimal canaliculus at the lacrimal punctum. Synonym: Foltz' valvule. (05 Mar 2000) |
| Braune's valve | A fold of mucous membrane at the junction of the oesophagus with the stomach. (05 Mar 2000) |
| cardiac valve prosthesis | See: valve. (05 Mar 2000) |
| parachute mitral valve | Congenital deformity of the mitral valve characterised by the presence of a single papillary muscle from which the chordae of both valve leaflets divide; thus the resemblance to a parachute; the condition often produces a stenosis as the combined result of the tugging action of the chordae on and the subsequent narrowing between the leaflets. Synonym: parachute deformity. (05 Mar 2000) |
| venous valve | A fold of the lining layer of a vein to prevent a reflux of blood. Synonym: valvula venosa. (05 Mar 2000) |
| Gerlach's valve | A fold of mucous membrane, simulating a valve, sometimes found at the origin of the vermiform appendix. Synonym: Gerlach's valve, valvula processus vermiformis. (05 Mar 2000) |
| Carpentier-Edwards valve | A bioprosthetic valve made from preserved porcine aortic valves. (05 Mar 2000) |
| vesicoureteral valve | <anatomy, urology> A lock mechanism in the wall of the intravesical portion of the ureter that normally prevents urinary reflux. (21 Jun 2000) |
| reducing valve | A valve designed to lower the pressure of a gas coming from a cylinder containing compressed gas under high pressure. (05 Mar 2000) |
| Vieussens' valve | The thin layer of white matter stretching between the two superior cerebellar peduncles, forming the roof of the superior recess of the fourth ventricle. Synonym: velum medullare superius, anterior medullary velum, Vieussens' valve. (05 Mar 2000) |