mitral insufficiency

noun Pathology.
abnormal closure of the mitral valve resulting in regurgitation of blood into the atrium and leading to reduced heart function or heart failure.
Also called mitral incompetence.


Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To mitral insufficiency
American Heritage
Medical Dictionary

mitral insufficiency n.
Valvular insufficiency involving the mitral valve.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Encyclopedia Britannica
Encyclopedia

mitral insufficiency

inability of the mitral valve to prevent the flow of blood back from the left ventricle, or lower chamber of the heart, into the left atrium, or upper chamber. Normally, the valve permits blood to flow from the atrium to the ventricle but prevents its return. Most often, the inability of the mitral valve to close adequately is caused by scarring from rheumatic heart disease; it may also be due to a congenital defect of the valve or may arise from defects in the muscles and tendons (the papillary muscles and chordae tendineae) that operate the valve. Less frequently it may be due to endocarditis (inflammation of the heart lining) or cardiac tumour. The condition is recognized from characteristic heart sounds and from patterns that show up in echocardiography or electrocardiography.

Learn more about mitral insufficiency with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
There may be heart murmurs or other signs of aortic insufficiency or mitral insufficiency.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature