Implantable loop recorder (ILR)
Implantable heart rhythm monitor
An ILR is a small device that is implanted under your skin to record your heart’s electrical activity
About ILR
An ILR is used to diagnose rare symptoms such as fainting (syncope), seizures, recurrent palpitations, or lightheadedness, which don’t happen often enough to be captured by a 24-hour heart monitor. The ILR device can be left in place for up to three years, enabling the heart to be monitored for an extended period of time.
Need to know
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What happens when a loop recorder is implanted? icon plus
An ILR is smaller than your little finger and fits under the skin of your chest, over your heart. The procedure to fit it is short and straightforward, meaning you will be treated as an outpatient or a day case. Your consultant will inject local anaesthetic to numb the skin below your left collarbone. They will then inject the device under the skin before closing the area, usually with surgical glue. The whole procedure takes about 20 minutes. -
How to prepare for your procedure icon plus
Your consultant will explain the procedure to you and answer any questions you might have. They'll let you know if you need to avoid eating, drinking or certain medications beforehand. Like all procedures, there may be some risks or side effects involved when implanting an ILR. Your consultant will explain these to you. -
After your procedure icon plus
After your ILR is fitted, your consultant cardiologist or physiologist will explain how it works. They'll also explain how to care for your chest while it heals. You should be able to go home the same day. Your consultant will let you know when you'll need to return for a follow-up appointment.
Our cardiac teams
Each cardiac department supports our cardiologists who specialise in implantable loop recorders. Your recorder will be implanted, then after a period of time, your results will be reported by your cardiologist.
Your cardiologist will talk you through the time scales involved, discuss your results and explain the next steps.
Your cardiologist will talk you through the time scales involved, discuss your results and explain the next steps.
Our locations
From complex cardiothoracic surgery to tests and diagnostic procedures, we provide exceptional cardiac care across our network of hospitals, outpatient centres and specialist clinics.
Request an appointment
Our booking teams can help you make an appointment with one of our experienced consultants.
020 7079 4344
This content is intended for general information only and does not replace the need for personal advice from a qualified health professional.