question: Hello doctor, I am 43 years old and had a heart attack. 45 days ago, I had angioplasty and a stent was placed. But now, the doctor says that one of my valves needs to be replaced as it is not functioning properly. My ejection fraction is only 30%. Is it safe to undergo open heart surgery now? For how many years will I be able to live after this operation? Can yoga or exercise help me in improving my ejection fraction or valve function?