Sean Smith was a 17-year-old high school senior when his heart troubles began. He remembers the cold symptoms, weight loss, tiredness and high fever caused by a virus. After five days, he left with a heart murmur that his doctor continued to monitor. For more than 20 years, the South Shore resident lived a normal life. A sports fan who enjoys playing sports - everything from softball to golf to sea kayaking -- he worked as a business development manager for a software company. Then one Monday, at age 37, he could barely get out of bed. "I was exhausted," he recalls. "I tried to walk up a little incline and I was out of breath. My heart felt racy."
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