hello Dr.

My brother suffered cariac arrest on Sept 10th and after being shocked 6 times and on life support for 2 days and open heart for mitral valve repair and then finally defiberlator implanted is out of the hospital after 20 days, truly a miracle and is fully funtioning. i have become affraid that this could happen to me, I did a echo, EKG which were all normal. Could his MVP have been the cause of his episode? The dr's arent so convinced it did? Please advise