If your heart seems to skip a beat, race, or work a bit too slow, you could have a condition known as arrhythmia. Your doctor might suggest you wear a device called a Holter monitor. This simple at-home tool helps track your heart's rhythm around the clock for a few days while you work, sleep, play, and do everyday tasks.

How Does It Work?

This battery-operated device is about the size of a postcard or digital camera. It continuously records your heart's electrical activity for at least 24 to 48 hours. Some newer models can record for up to 2 weeks.