Implantable Loop Recorder
An implantable loop recorder (ILR) is a small, discreet device placed just under the skin to continuously monitor and record your heart rate and rhythm over an extended period. It is particularly helpful in identifying the cause of unexplained symptoms such as fainting, dizziness, or palpitations, especially when previous tests like ECGs or Holter monitors have not detected anything abnormal.
The device automatically records when it detects irregular activity and can also be manually triggered using a handheld activator or mobile app. The recorded data is securely transmitted to your medical team for review and diagnosis.
What does it do?
The ILR allows for continuous heart rhythm monitoring, capturing both symptomatic and asymptomatic arrhythmias over months or even years. This provides your doctor with valuable insights into your heart’s activity during your daily routine, which short-term monitoring tools might miss.
The device:
- Records automatically when it detects abnormal heart rhythms
- Can be manually activated when you experience symptoms
- Transmits data remotely to your healthcare provider
Is typically used for 3 to 4 years, offering long-term diagnostic coverage
How does it work?
The implantable loop recorder detects electrical signals from the heart through built-in electrodes. When it recognises unusual rhythms—such as very slow, fast, or irregular heartbeats—it stores the data.
You can also prompt the device to record if you feel symptoms like palpitations or light-headedness. Many devices now connect with a smartphone app or a home transmitter, allowing secure and regular data uploads to your cardiology team.
ILRs are often used to detect arrhythmias such as atrial fibrillation, which can increase the risk of stroke or sudden cardiac events
Why is it performed?
An ILR may be recommended when intermittent heart rhythm issues are suspected, but short-term testing hasn’t provided answers. It may be used to investigate:
- Unexplained fainting episodes (syncope)
- Recurring palpitations or dizziness
- Suspected arrhythmias that occur infrequently
- Possible cardiac cause of a stroke with no other identifiable cause
By monitoring over a longer period, an ILR can detect patterns that would otherwise go unnoticed.
The procedure
The insertion of a loop recorder is a quick and low-risk procedure, typically done under local anaesthesia:
- A small incision is made in the upper chest
- The device is gently inserted just beneath the skin
- The area is closed with stitches or surgical adhesive
You may feel the device shift slightly over time, which is normal and does not affect its function.
Recovery
Most patients return home on the same day. Before discharge, your medical team will:
- Show you how to use the handheld activator (if needed)
- Provide a home monitoring device that sends data to your doctor automatically
- Offer detailed guidance on wound care, device usage, and follow-up
The device is discreet, and most people quickly return to normal activities with minimal disruption.