Abbott's Vishnu Charan, left, and Dr. Avi Fischer in Sylmar.

Abbott's Vishnu Charan, left, and Dr. Avi Fischer in Sylmar.

A paperclip-sized revolution in cardiac electrophysiology is afoot in a bright white lab at Abbott Laboratories in Sylmar, where the world’s first Bluetooth- and smartphone-enabled implantable cardiac monitor are coming off the assembly line...

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