The operation is a daring one: To replace a failing heart valve, cardiologists insert a replacement through a patient’s groin and thread it all the way to the heart, maneuvering it into the site of the old valve.

The procedure, called transcatheter aortic valve replacement (TAVR), has been reserved mostly for patients so old and sick they might not survive open-heart surgery. Now, two large clinical trials show that TAVR is just as useful in younger, healthier patients.

It might even be better, offering lower risks of disabling strokes and death, compared to open-heart surgery. Cardiologists say it will likely change the standard of care for most patients with failing aortic valves.

“Is it important? Heck, yes,” said Dr. Robert Lederman, who directs the interventional cardiology research program at the National Heart, Lung and Blood Institute. The findings “were remarkable,” he added.