My fiance has congenital heart defects and now i wonder what i am getting into. will this affect his ability to work?

It depends!: It depends on which congenital heart defects he has, what surgeries have been done to repair them, and what his current cardiac status is now. I recommend having your fiance schedule an appointment with his cardiologist, so that you can ask his cardiologist these questions.

Depends: This depends on what the congenital heart defect is, the severity of the defect, was it operated on early in life, does he need heart meds or further surgery.