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When a 22-year-old needed a heart transplant, an implantable heart pump kept him alive until his second chance came through.

Perry Charleston had every reason to believe he would die in his 40s. Then he met Dr. Michael Dickinson.

'I had to walk away,' Mike Gruszka says. 'How can I ask them to give 100 percent when I can’t?'

In medical terms, it can lead to chest pain and an abnormal heart rhythm, among other symptoms.