papillary muscle

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papillary muscle

[′pap·ə‚ler·ē ′məs·əl]
(anatomy)
Any of the muscular eminences in the ventricles of the heart from which the chordae tendineae arise.
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Other nonspecific findings that can be seen on echocardiography include reduced global left ventricular systolic function, left ventricular diastolic dysfunction, left ventricular thrombi, and abnormal papillary muscle structure (9).
Improvement in Cardiac Function After Bypass Grafting, With or Without Suturing of Left Ventricular Papillary Muscles Average increase Average increase after bypass grafting after bypass grafting plus suturing only Measure (n = 8) (n = 32) Cardiac reserve 168% 14% Peak cardiac power output 83% 11% Peak cardiac output 35% 6% Exercise duration 33% 18% Peak V[O.
Myocardial samples for electron microscopic examination included samples from the anterior and posterior papillary muscle, respectively.
Scarring of the left ventricular papillary muscles in sickle-cell disease.
It was clear that the medial papillary muscle had been severely damaged and partially avulsed following the multiple percutaneous attempts at retrieval, the consequence of which was acute tricuspid insufficiency.
The more recently investigated mechanism concerns the decrease in effective posterior restraint (increased leaflet slack) caused by anterior redirection of papillary muscle tension; increased length of the residual leaflet, which is relatively free to move anteriorly, unlike the coapted leaflet bodies; and interposition of the leaflets into the path of outflow with the potential to cause drag forces (pushing forces of flow) (5, 6).
Other features, useful but not necessary in diagnosing HCM, are: 1) mitral valve systolic anterior motion (absent or mild in nonobstructed pattern) (9); 2) anteriorly positioned mitral valve leaflet coaptation (10,11); 3) anomalous anterior insertion of papillary muscles (12,13), 4) diastolic dysfunction.
Obstruction is the result of a complex interaction between the septum and the mitral valve leaflets and its supporting structures, the chordae tendineae and the papillary muscles (7-9).
The papillary muscles are often positioned more anteriorly and frequently bound to the asymmetrically hypertrophied septum.

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