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Loop Recorder

Also known as: Implantable Loop Recorder, ILR

Duration: Variable

The loop recorder is an implantable device that continuously monitors the heart’s electrical activity for up to 3 years (in comparison to the Holter or Event monitors). This is a helpful test when others have failed to diagnose the cause for conditions like syncope, cryptogenic stroke, or palpitations/arrhythmias and to develop treatment plans.


  • Mainly to figure out the cause of multiple fainting/syncope episodes
  • In older adults with no known reason for falling
  • Irregular heartbeats (arrhythmias)
  • Cryptogenic stroke

Preparing for the test:

Download Pre & Post Test Instructions

How is the test performed:

  • A local anesthetic will be given to help you relax.
  • A minor incision is then given to place the device in your chest (under the skin) near your heart.
  • Once the loop recorder has been implanted, it works as a continuous EKG.
  • The incision will be closed and a bandage will be placed over it.
  • You will be asked to keep a transmission monitor by your side to continuously record the data.
  • Your cardiologist will monitor the data that is gathered.
  • You will also be asked to keep a log to write down details of any symptoms you may be experiencing.

Houmsse M, Ishola A, Daoud EG. Clinical utility of implantable loop recorders. Postgrad Med. 2014 Mar;126(2):30-7. doi: 10.3810/pgm.2014.03.2738. PMID: 24685966.
Silveira I, Sousa MJ, Antunes N, et al. Efficacy And Safety Of Implantable Loop Recorder: Experience Of A Center. J Atr Fibrillation. 2016;9(2):1425. Published 2016 Aug 31. doi:10.4022/jafib.1425
Bisignani A, De Bonis S, Mancuso L, Ceravolo G, Bisignani G. Implantable loop recorder in clinical practice. J Arrhythm. 2018;35(1):25-32. Published 2018 Nov 20. doi:10.1002/joa3.12142
Wechselberger S, Piorkowski C, Pohl M. Current rare indications and future directions for implantable loop recorders. Herzschrittmacherther Elektrophysiol. 2016 Dec;27(4):366-370. English. doi: 10.1007/s00399-016-0475-x. PMID: 27873022.