A Holter monitor
is a portable device that doctors
may prescribe to help gather more information about the electrical activity of a patient's heart. The monitor itself is comprised of several leads (stickers) that are attached to different parts of the chest wall. These leads are connected by wires to a device typically worn around the waist, which contains the ability to continuously record the information picked up by the leads. The monitor itself is completely painless and is generally worn for 1-2 days. After the study period is over, the device is analyzed and reviewed by your doctor. The device records the type of heart rhythm you are experiencing at all times, and also gives statistics on the average heart rate and ranges of heart rate that you experience.
The device is often used to help make a diagnosis in patients that may complain of symptoms suggestive of an underlying irregular heart rate, such as palpitations or a fluttering sensation in the chest.