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

Sheriff Nanos admits to missteps in the investigation of Nancy Guthrie's disappearance, including releasing the crime scene ...

Atrial fibrillation, or A-fib, is becoming more common, but doctors say treatments are improving. The condition is a ...

Savannah Guthrie says in a new video Saturday that the family has received a message from the kidnapper or kidnappers and will pay ransom for the return of her mother ...

The 84-year-old has not been seen or heard from since Saturday night.

“It’s quite a heavy thing to be told when you're so young and have lived a generally normal and healthy life until that point.” ...

Nancy Guthrie was reported missing on Sunday after not showing up for church.

San Clemente-based cardiac device company AtaCor Medical announced a collaboration with Abbott Laboratories to develop a next-generation implantable defibrillator.

Annie and Tommaso Cioni attempted to cover their faces during a Tuesday drive, two days after the 84-year-old matriarch was ...

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.

The investigation into the apparent kidnapping of Nancy Guthrie, mother of "Today" show host Savannah Guthrie, continues. Authorities believe she was taken last weekend. Savannah Guthrie ...

Troubling details have emerged in the missing case of Nancy Guthrie, the 84-year-old mother of NBC star Savannah Guthrie. A ...