Mitral annulus

Mitral annulus

The mitral annulus is a fibrous ring that is attached to the mitral valve leaflets. Unlike prosthetic valves, it is neither circular nor continuous. The annulus contracts and reduces its surface area during systole to help provide complete closure of the leaflets. Annular dilatation can result in poor leaflet apposition, leading to mitral regurgitation. [1]

The normal diameter of the mitral annulus is 3.1 ± 0.4 cm, and the circumference is 8 to 9 cm. There is no histologic evidence of an annular structure anteriorly, where the mitral valve leaflet is contiguous with the posterior aortic root. [2]

References

  1. ^ Perloff, JK; Roberts, WC (1972). "The mitral apparatus. Functional anatomy of mitral regurgitation". Circulation 46 (2): 227–39. 
  2. ^ Otto, Catherine M.; Robert Bonow (September 2009). Valvular Heart Disease: A Companion to Braunwald's Heart Disease: Expert Consult - Online and Print. Elsevier Health Sciences. ISBN 1-4160-5892-3. 



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