Hello.
First, let me express my condolences on your medical condition. I wish you best of luck in your life and marriage.
Unfortunately, I cannot answer any of your questions because I'm not a cardiologist. You need to talk with your physician about these concerns, because s/he has knowledge about your unique medical history and can give you information about the most appropriate course for you to take.
You might also consider the option of in vitro fertilization, which means you collect your semen during self-pleasuring and it is then inserted into your wife's vagina for fertilization.
If you'd like the MedHelp cardiologist to respond to this post, I suggest you repost in the Cardiovascular Expert Forum at:
http://www.medhelp.org/forum_disclaimers/show/114
Best of luck to you. Dr. J