USUS·CBS NewsA teenager collapsed. His friends' quick response saved his life.J.J. Machnik went into sudden cardiac arrest because of a genetic heart disorder that affects 1 in 500 people: hypertrophic cardiomyopathy.Lean LJun 22Read at CBS News→USUS·CBS NewsA teenager collapsed. His friends' quick response saved his life.J.J. Machnik went into sudden cardiac arrest because of a genetic heart disorder that affects 1 in 500 people: hypertrophic cardiomyopathy.Lean LJun 22Read at CBS News→