It is understood the concerns do not relate to children's heart surgery but to his adult cardiac work.

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Nearly 20 billion was spent last year worldwide on a variety of medical procedures from fertility treatments to elective cardiac surgery, dental work, as well as cosmetic procedures.

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And of the 220, 000 incidences of sudden cardiac arrest per year in the U.S., about 10, 000 occur at work.

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In years past, cardiac rehabilitation was often suggested only for people who were younger and needed help getting in shape to return to work after a heart attack or surgery.

CNN: updated