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-surging struggle with her possible captors, a lead cardiologist speculated Thursday.

Innovative symbiotic transcatheter pacemaker harvests heart motion energy for lifelong pacing. Learn how this could transform cardiac care.

"I firmly believe that being totally unaware of my condition, I could have gone into cardiac arrest."

Heart problems are nothing new. Humans have been fascinated by electrocardiography since the era of Hippocrates (via St. Luke's Hospital Cardiology Department). With each passing century, medicine's understanding of the cardiac system and the electricity ...

A pacemaker is a small, battery-powered device that controls the heartbeat. Our heartbeats are controlled by a highly efficient, biological electrical system that ensures our heart steadily pumps blood to the rest of the body. But sometimes — due to age ...

The cardiac pacemaker harmlessly dissolves over the course of 35 days. (Courtesy: Northwestern University) Temporary cardiac pacemakers provide essential pacing for patients with short-term heart rhythm disorders following cardiac surgery or while waiting ...

Sometimes a slow heart rhythm can cause people to experience tiredness, difficulty with exercise, or dizziness and fainting. Although other problems can cause these symptoms (for example, blood loss or a weak heart muscle), if a slow heart rate is the ...

Fun fact: Your heart doesn’t need a brain, or a body for that matter, to beat. That’s because it has its own electrical system independent of your nervous system. However, the heart’s beating can go haywire in certain medical conditions. This is ...

The cardiac pacemaker of the future could be powered by the heart itself, according to researchers at Shanghai Jiao Tong University. During the AIP Publishing Horizons -- Energy Storage and Conversion virtual conference, which will be held Aug. 4-6, Yi ...

Sheriff Chris Nanos takes questions on day 6 of the search for the abducted 84-year-old mother of NBC morning show co-host Savannah Guthrie.