One part of the investigation into the disappearance of "Today" show host Savannah Guthrie's mother focuses on the missing woman's implanted medical device.

Pima County investigators are using Apple Watch and iPhone data — specifically an interrupted pacemaker sync — to establish a precise timeline in the abduction of Nancy Guthrie from her Tucson home.

Nancy Guthrie’s pacemaker reportedly stopped syncing with her Apple devices predawn Sunday morning – as the Arizona sheriff leading the missing person case called a surprise press conference for late Tuesday morning.

Two types of implantable cardioverter defibrillators can reduce the risk of sudden cardiac death with HCM. Pacemakers and implantable loop recorders also may be options.

Unconfirmed media reports say Nancy Guthrie's pacemaker stopped syncing with her Apple devices. Here's what that means.

Biotronik designed its leadless pacing system to use atrial electrical far-field sensing. The company says it would represent the world’s first intracardiac pacemaker to do so. It enables atrioventricular (AV)-synchronous pacing at rest and during exercise with a single cardiovascular implantable electronic device (CIED).

Pediatric cardiologists have implanted a dual chamber leadless pacemaker in a child. UC Davis Director of Pediatric Electrophysiology Dan Cortez has set another world record: He is the first to implant a dual chamber leadless pacemaker in a child.

Dr. Hunter Champion answers the question: 'What Is A Biventricular Pacemaker?' — -- Question: What is a biventricular pacemaker or cardiac resynchronization therapy (also called a CRT device), how is it implanted for heart failure patients, and who is ...

The patients who made the biggest news at last week’s meeting of the American Heart Association in Miami were those who can talk about their “tickers” without being cute. They are the growing number, estimated at 200, whose heartbeats are timed by ...