As the search for Savannah Guthrie's mother, Nancy, continues, a cardiologist explains how pacemakers work and if they can be ...

The heart devices do not track location, nor do they transmit across large distances. Like an estimated three million Americans, Nancy Guthrie, the 84-year-old mother of the NBC News anchor Savannah ...

Nancy Guthrie’s 2 a.m. pacemaker spike on the day she vanished could mean that the elderly woman was involved in a heart rate ...

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

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

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.