An implantable loop recorder is a small device that is implanted under the skin to help identify the causes of fainting. Syncope (or fainting) is a temporary loss of consciousness. Certain heart disorders can cause fainting, such as abnormal heartbeats called arrhythmias.

An implantable loop recorder is a small device that is inserted under the skin below the collar bone (usually on the patients left side). The procedure to implant the device is simple. Local anesthetic is injected into the area. A small incision is made and device is inserted. The skin is then sutured closed. The device continuously records heart activity similar to an ECG for up to 2 years. If the patient experiences an episode of fainting the device is activated to save the recording before, during, and after the episode. The recordings can then be evaluated by a physician to help determine the cause of fainting.