For the diagnosis of seldom-occurring, yet clinically significant cardiac arrhythmia, so-called “event monitors” are given to patients as mini long-term ECGs lasting 2-3 weeks. Event monitors are useful if the recording of cardiac arrhythmia during a 24 or 48-hour ECG has not been successful. The device is attached to the chest externally, and the ECG monitoring started via a button.
For an extended observation period of up to 3 years, event monitors can also be implanted beneath the skin of the chest. The recordings are regularly read by a special computer and then analyzed.