orifice

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Related to mitral orifice: mitral stenosis

orifice

[′ȯr·ə·fəs]
(electromagnetism)
Opening or window in a side or end wall of a waveguide or cavity resonator through which energy is transmitted.
(science and technology)
An aperture or hole.

orifice

orifice
A mouth, aperture, opening, perforation, passage, or hole. The size of an orifice normally is fixed.
References in periodicals archive ?
Nonrheumatic causes of MS include congenital anomalies (38, 39); large mitral annular calcific deposits associated with left ventricular outflow obstruction (45, 46) (Figure 17); neoplasms (particularly myxoma) protruding through the mitral orifice (47); large vegetations from active infective endocarditis (48); and of course a mechanical prosthesis or bioprosthesis used to replace a native mitral valve (49).
That's the procedure in which the posterior and anterior leaflets are brought together in the central portion of the mitral orifice, and it results in a double-orifice mitral valve.
The classic left atrial myxoma is a mobile echogenic mass that is in the body of the left atrium in ventricular systole and passes into the mitral orifice in ventricular diastole.