HEART ATTACK CENTER: Anatomy > Ejection Fraction   Prevention Center   Survivor Center

Copyright 2002 Nucleus Communications, Inc. All rights reserved.   Normal ejection fraction Systole is the term used to describe the beating phase of the heart. During normal systole, the left ventricle contracts, pumping oxygen-rich blood into the aorta. In a normal heart, approximately 55% of the blood in the left ventricle is pumped out with each contraction. This is referred to as an ejection fraction of 0.55. Previous | Next Learn more about ejection fraction ICD may help patients with low EF.    Find out how Guidant's innovative medical technologies can help improve your life.