This is from their website:
Fitness and Diving Issue
An individual who has undergone coronary artery bypass grafting or angioplasty (with or without stent placement) may have suffered significant cardiac damage prior to having the surgery. The post-operative cardiac function of individuals dictates their fitness for diving.
Anyone who has had open-chest surgery needs appropriate medical evaluation prior to scuba diving. After a period of stabilization and healing (6-12 months is usually recommended), the individual should have a thorough cardiovascular evaluation prior to being cleared to dive. He or she should be free of chest pain and have normal exercise tolerance, as evidenced by a normal stress EKG test (13 mets or stage 4 of the Bruce protocol - defined at the end of previous section on MI). If there is any doubt about the success of the procedure or how open the coronary arteries are, the individual should refrain from diving
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