WASHINGTON – U.S. health regulators are warning doctors and patients about safety issues with two separate Boston Scientific heart devices recently linked to injuries and deaths.

The Food and Drug Administration issued two alerts Wednesday about electrical problems tied to the company's heart-zapping defibrillator systems and a separate issue with a heart implant used to reduce stroke risk.

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The agency said the company's Endotak Reliance defibrillator wires can become calcified, leading to failures in delivering life-saving shocks to the heart, according to the FDA.

Defibrillators are surgically placed in the upper chest, where they monitor irregular heartbeats and use electrical shocks to jolt the heart back to normal.

As of July 24, Boston Scientific has repor

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