I have Hypertrophic Obstructive Cardiomyopathy and SAM and a ICD implanted have had the myectomy surgery and have had my mitral valve repaired. after a year went and had a echocardiogram and the MR is back to severe. the first surgery went well but was a couple of days coming off the respirator. the second for the valve repair i spent 11 days intubated in a chemical coma now they want to install a mechanical valve. what do you think my chances are this time.