with blockages of between 95 and 100%. My questions are: 1. Can you direct me to a site which explains the procedure in simple terms 2. What caused it ? He s 62, doesn't smoke, was a champion squash player, a little overweight , drinks wine in moderation. 3. Is it hereditary ? (My mother died of a heart attack when she was 76) 4. At 48, should I be be having my heart checked ? Thank you all so much for your answers, support and prayers.