I feel bad for Aaron Boone, but it's not a life-or-death situation, thankfully.
“I have been diagnosed with a heart condition involving my aorta and aortic valve,” he said. “I’ll need surgery to correct the problem. Initially my doctors thought I could delay corrective surgery for some time, but because of some variations in my condition, they are now advising me to deal with the problem sooner rather than later. Am I going to recover well enough to play baseball again? Probably. Will I play baseball again? I don’t know at this time. We’ll cross that bridge when I get there.”
Again, glad to hear that it doesn't appear too serious - though any time open-heart surgery is involved, it's going to be serious. Boone - and the Astros, apparently - had known about the condition since his days at USC.