Well, I guess the most important question is, how long since his surgery?
Right now, I am one month out. My limit was no lifting, pushing, or pulling anything over 10lbs. At my 1 month appointment it was raised to 20lbs. I am anticipating this limit to be substantially raised to 50lbs or more at 3 months and hopefully removed soon after but I do not know.
My surgeon was VERY serious on this point as I am 29 and a rather muscular individual. I'm having a hard time limiting myself. However, there have been many people in my situation who have over done it lately and have ended up back in emergency or worse. As my nurse told me, "you only have one chance to heal right the first time".
I understand how difficult it is to ask for help or break the cycle of doing things for yourself out of second nature, and I've probably over done it a few times myself. I would advise him to put extra thought into his actions at this point.
(just as a note, I had a 6" dacron graft installed recently to replace a rather sever ascending aortic aneurysm that went up into my arch. I had this done in conjunction with my valve replacement.)
Best Wishes!
Brian