What is the mortality rate for open heart surgery?

Depends: The mortality rate for heart surgery varies quite a bit. It depends on the type of surgery, the health of the patient, the age of the patient, and other things like redo, emergency, etc. Typically the motrality is somewhere between 1-2% for most types of surgeries. Some surgeries, however, can carry 10-20% or higher. You need to discuss this with the surgeon.

It varies: Coronary bypass 1-3% is range this is 80 % of many practices aortic valve 3-5 % mitral valve slightly higher congenital heart has many variables! the society for thoracic surgeons has a database to enter some of the patient variables to get a reasonably accurate %.