Most good heart centres achieve success rates nearing 99% or more. There are mainly two different sets of patients though:
Elective: that ones who haven’t had a heart attack and have a good heart function
Emergency: who need a bypass surgery soon after a heart attack that has left the heart with muscle damage and poor heart function.
Since we operate on an ageing population, additional comorbidities like diabetes, hypertension, strokes, kidney and liver failure etc also come in the picture. Each of these illnesses can aggravate risk of hospitalisation and surgery.