Ejection fraction refers to the percentage of blood that is pumped out of the heart ventricle with each heartbeat. A normal ejection fraction is 55 to 75 percent. An EF of less than 40 percent indicates that the heart muscle has been damaged and is not functioning properly
An LVEF over 75% is considered too high, or medically-termed as being a hyperdynamic or a hypercontractile left ventricle (LV), that is, the heart is pumping forcefully, an excessive amount of blood is being pumped out.
According to various medical literature, there a few specific clinically-recognized causes of a hyperdynamic/hypercontractile left ventricle, which includes aortic valve regurgitation (leakage), sometimes the mitral valve, hypermetabolic states (thyrotoxicosis, anemia), some congenital heart defects (e.g., large patent ductus arteriosus, and ventricular septal defect), and hypertrophic cardiomyopathy (HCM). The condition may/can also be deemed as idiopathic (no known cause).
You may want to ask this on the expert forum. I hope this helps.
An EF of 80% may be a normal condition at a specific time interval altough it is outside the normal EF 55 to 75%; EF represents the percentage of blood pumped into circulation with each heartbeat.
The EF represents a mechanism that helps maintain a balance between the left and right side of the heart. If the left side is out of balance, the left ventricle will dilate to increase stroke volume and stronger contractility to compensate. Not unlike a compensatory increase of the heart rate.
A problem develops when there is sustained overcompensation. The dilation stretches the heart's capacity to a point where contractility is reduced, and this conditrion will eventually lead to heart failure (EF below 29%). The imbalance of more blood rec'd to the LV than pumped out into circulation causes the blood to back up into the lungs (congested heart failure).
Copyright 1994-2017MedHelp International.All rights reserved. MedHelp is a division of Aptus Health.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.