Medicine: Revitalized Hearts

Jack March, 53, is a tennis pro who puts in up to eight grueling hours a day on the courts at Cleveland's Shaker Racquet Club. John P. Callahan, 51, a funeral director in Terre Haute, Ind., regularly plays 36 holes of golf in a day; he hunts and fishes and has built his own log cabin. John Williams, 55, works full time as a regional vice president of National Cash Register Company in St.

Petersburg, Fla.

What makes these men's activities remarkable is that they have all had drastic surgery to improve the circulation in their hearts by bypassing severely diseased portions of...

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