What is a Loop Recorder?
A loop recorder (also called an implantable loop recorder or ILR) is a very small heart monitor placed just under the skin of your chest. Unlike a pacemaker or defibrillator, it does not send electrical signals — it simply records your heart rhythm over a long period of time.
Why might I need a loop recorder?
Sometimes it’s difficult to know why you’re having symptoms such as fainting, dizziness, palpitations, or blackouts. Standard heart tests like an ECG or Holter monitor only record for a short time, so they may miss the problem if it doesn’t happen often.
A loop recorder can continuously monitor your heart for 2 years or more, helping your doctor capture rare or unexplained rhythm issues.
How does it work?
The device is about the size of a USB stick or matchstick and sits just under the skin, usually on the left side of the chest.
It continuously records your heart’s electrical activity.
If you have symptoms (like dizziness or fainting), you can use a small handheld activator or app to “mark” the recording.
The data is securely transmitted to your healthcare team through remote monitoring, so they can review your heart rhythm and see what was happening at the time of your symptoms.
Living with a loop recorder
The implant procedure is quick, often done under local anaesthetic, and most people go home the same day.
You won’t feel the loop recorder working — it’s silent and simply records your heart rhythm.
It won’t interfere with your daily life, travel, or most activities.
Like other devices, it is checked regularly through remote monitoring and occasional clinic visits.
How long does a loop recorder last?
Loop recorders usually last a minimum of 2 years before the battery runs out. If your doctor has already captured the information needed before then, the device may be removed earlier. Removal is usually a quick day procedure, similar to how it was implanted.
Reassurance for you
A loop recorder can provide answers to ongoing symptoms and give both you and your doctor peace of mind. By continuously recording your heart rhythm, it can help take the guesswork out of finding the cause of fainting, dizziness, or palpitations.