Regurgitation ( circulation ) - Wikipedia Regurgitation ( circulation ) This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( December 2009 ) Regurgitation is blood flow in the opposite direction from normal, as the backward flowing of blood into the heart or between heart chambers. It is the circulatory equivalent of backflow in engineered systems. It is sometimes called reflux, as in abdominojugular reflux. Regurgitation in or near the heart is often caused by valvular insufficiency ( insufficient function, with incomplete closure, of the heart valves ) ; for example, aortic valve insufficiency causes regurgitation through that valve, called aortic regurgitation, and the terms aortic insufficiency and aortic regurgitation are so closely linked as usually to be treated as metonymically interchangeable. The various types of heart valve regurgitation via insufficiency are as follows : Aortic regurgitation : the backflow of blood from the aorta into the left ventricle, owing to insufficiency of the aortic semilunar valve ; it may be chronic or acute. Mitral regurgitation : the backflow of blood from the left ventricle into the left atrium, owing to insufficiency of the mitral valve ; it may be acute or chronic, and is usually due to mitral valve prolapse, rheumatic heart disease, or a complication of cardiac dilatation. See also Mitral regurgitation. Pulmonic regurgitation : the backflow of blood from the pulmonary artery into the right ventricle, owing to insufficiency of the pulmonic semilunar valve. Tricuspid regurgitation : the backflow of blood from the right ventricle into the right atrium, owing to imperfect functioning ( insufficiency ) of the tricuspid valve. Regurgitant fraction Regurgitant fraction is the percentage of blood that regurgitates back through the aortic valve to the left ventricle due to aortic insufficiency, or through the mitral valve to the atrium due to mitral insufficiency. It is measured as the amount of blood regurgitated into a cardiac chamber divided by the stroke volume. This fraction affords a quantitative measure of the severity of the valvular lesion. Normally, no blood regurgitates, so the regurgitant fraction is zero. In patients with severe valvular lesions, regurgitant fraction can approach 80 %. See also Valvular heart disease Stenosis Look up Regurgitation in Wiktionary, the free dictionary. This cardiovascular system article is a stub. You can help Wikipedia by expanding it. Retrieved from `` https://en.wikipedia.org/w/index.php?title=Regurgitation_(circulation)&oldid=811010361 '' Categories : Cardiology Cardiovascular system stubs Hidden categories : Articles lacking sources from December 2009 All articles lacking sources All stub articles Talk About Wikipedia Deutsch Қазақша Norsk nynorsk Русский Українська Edit links This page was last edited on 18 November 2017, at 23 : 30. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: what is backflow of blood in the heart called
Answer: Regurgitation