EurekAlert! -- An uncommonly used surgical procedure that bypasses a narrowed aortic valve, rather than replacing it, effectively restores blood flow from the heart to the rest of the body and gives high-risk patients a safe alternative to conventional valve surgery. That is the finding of a study conducted at the University of Maryland Medical Center in Baltimore. The researchers conclude that the procedure, called aortic valve bypass, is an important treatment option for high-risk elderly patients with a narrowed aortic valve, a condition called aortic stenosis.