In 1998 during a St.Louis Blues and Detroit Red Wings game, Chris Pronger's heart stopped while blocking a shot. For more on the situation, here is a report published by Helene Elliot back in 1998.
"When St. Louis defenseman Chris Pronger crumpled to the ice unconscious, his heart jolted out of rhythm after he was struck in the chest by a slap shot from Detroit defenseman Dmitri Mironov; players paled in fright. In the midst of what had been a spirited playoff game, which the Red Wings would win, 6-1, Sunday to tie the teams' Western Conference semifinal series at one game each, it was a graphic reminder of how thin a line they skate between triumph and tragedy.
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