Implantable Loop Recorder

A small, insertable cardiac monitor that continuously records your heart rhythm for up to 3 years — capturing arrhythmias that other tests might miss.

What is an Implantable Loop Recorder?

An implantable loop recorder (ILR), also called an insertable cardiac monitor (ICM), is a small device about the size of a AAA battery that is placed just under the skin of your chest. Unlike external monitors that you wear for days or weeks, an ILR continuously monitors your heart rhythm for up to 3 years.

The device automatically detects and records abnormal heart rhythms (arrhythmias), and you can also activate it manually when you feel symptoms like palpitations, dizziness, or fainting. The recordings are transmitted wirelessly to your doctor's office for review.

Because many arrhythmias occur infrequently and unpredictably, standard tests like ECGs or short-term monitors often fail to capture them. The ILR's long-term monitoring capability makes it invaluable for diagnosing elusive heart rhythm problems.

Who May Benefit from a Loop Recorder?

Dr. Bleszynski may recommend an ILR if you have:

Unexplained fainting (syncope) — especially if it occurs infrequently
Palpitations or rapid heartbeat that isn't captured on standard tests
Cryptogenic stroke — stroke without an identified cause, to look for hidden AFib
Suspected atrial fibrillation that hasn't been documented
Symptoms that suggest arrhythmia but standard monitors haven't found a cause
Need for long-term monitoring after ablation procedures
Unexplained dizziness or lightheadedness

Key Benefits of Loop Recorders

Continuous Monitoring

Records your heart rhythm 24/7 for up to 3 years, catching events that occur weeks or months apart.

No External Devices

Once implanted, there's nothing to wear, charge, or remember — the device works automatically.

Remote Transmission

Data is sent wirelessly to your doctor, allowing timely review without frequent office visits.

Patient Activation

You can trigger a recording when you feel symptoms, correlating your experience with your heart rhythm.

The Implant Procedure

Inserting a loop recorder is a simple, minimally invasive procedure that takes only about 10-15 minutes and is performed in the office or outpatient setting.

Local Anesthesia

The skin on your upper left chest is cleaned and numbed with local anesthetic. You'll be awake but won't feel pain.

Small Incision

A tiny incision (about 1 cm) is made just to the left of your breastbone. No stitches are typically needed.

Device Insertion

The loop recorder is inserted just beneath the skin using a special tool. The device sits parallel to the skin surface.

Programming

The device is programmed and tested to ensure it's detecting your heart rhythm properly. You'll receive a handheld activator.

Recovery & Living with Your Loop Recorder

Recovery is quick and most patients return to normal activities immediately:

•You can go home right after the procedure
•Keep the incision site clean and dry for 24-48 hours
•Minor bruising or tenderness at the site is normal and resolves in a few days
•The device is MRI-compatible (conditional) — inform healthcare providers you have an implant
•Carry your device ID card in your wallet
•Use the handheld activator when you experience symptoms

What Happens If an Arrhythmia is Detected?

When the loop recorder detects an abnormal rhythm, the data is automatically transmitted to our office for review. If a significant arrhythmia is found, Dr. Bleszynski will contact you to discuss next steps, which may include:

Starting blood thinners if atrial fibrillation is detected (to prevent stroke)
Medications to control heart rate or rhythm
Cardioversion or ablation procedures
Pacemaker implantation if slow heart rhythms are causing symptoms
Watchman device for stroke prevention in AFib patients who can't take blood thinners

Device Removal

The loop recorder can be removed at any time once it's no longer needed or when the battery expires (typically after 3 years). Removal is a simple outpatient procedure similar to the implant — a small incision is made under local anesthesia, and the device is removed. Most patients return to normal activities the same day.

Quick Facts

Procedure Time: 10-15 minutes
Anesthesia: Local only
Device Size: ~1/3 the size of AAA battery
Battery Life: Up to 3 years
Recovery: Immediate

Unexplained Symptoms?

If you've experienced fainting, palpitations, or other symptoms without a clear cause, a loop recorder may provide answers.