More than 20 years ago, Terri Mattula’s dog Gator passed out while her husband was walking him. They took Gator to the vet and learned he had a third-degree heart block and needed a pacemaker. However ...

Balance athletic goals with arrhythmia risk: match the device model and sensor to the sport, and use stress testing to set detection zones and avoid inappropriate therapy.

More than 20 years ago, Terri Mattula’s dog Gator passed out while her husband was walking him. They took Gator to the vet and learned he had a third-degree heart block and needed a pacemaker. However ...

More than 20 years ago, Terri Mattula's dog Gator passed out while her husband was walking him. They took Gator to the vet and learned he had a third-degree heart block and needed a pacemaker. However ...

Add Yahoo as a preferred source to see more of our stories on Google. Electrocardiograms, or ECGs, record the electrical activity of your heart. Randy Faris/The Image Bank via Getty Images Your ...