Introduction

What is Implantable Loop Recorder?

The implantable loop recorder (ILR) is a small electronic device implanted under the skin of the chest. It continuously monitors your heart rhythm to help detect irregularities, particularly arrhythmias, which may be the underlying cause of unexplained fainting, dizziness, or palpitations. The device is typically implanted on the left side of the chest and includes two internal electrodes for continuous monitoring. The battery can last for more than 12 months.

Causes

Causes

Heart rhythm irregularities (arrhythmias) may be caused by various conditions or factors, such as:

  • ● Structural heart disease (e.g. cardiomyopathy)
  • ● Coronary artery disease or previous heart attack
  • ● Congenital heart defects
  • ● Abnormalities in the heart’s electrical system (e.g. sick sinus syndrome, conduction block)
  • ● Electrolyte imbalances (e.g. potassium or magnesium)
  • ● Medication side effects
  • ● Excessive alcohol or stimulant use
  • ● Thyroid dysfunction
  • ● Genetic conditions affecting the heart's rhythm

These conditions may disrupt the electrical impulses that coordinate your heartbeat, leading to symptoms and requiring long-term monitoring.

Symptoms

Symptoms

The ILR is generally used to investigate recurrent, unexplained symptoms that may be linked to heart rhythm abnormalities, such as:

  • ● Dizziness
  • ● Palpitations
  • ● Fainting (syncope)
  • ● Sudden loss of consciousness

These symptoms may occur occasionally, making them difficult to capture using conventional short-term monitoring tools.

Operation

The ILR Procedure

This is a minor invasive procedure performed under local anesthesia in a Cardiac Catheterization & Intervention Laboratory. You will remain awake during the procedure, though mild sedation may be given to help you relax.

A small incision (about 2 cm long) is made on the left side of the chest. The ILR device is inserted beneath the skin through this incision. Once in place, the incision is closed with sutures and covered with a dressing. The entire procedure usually takes about 20–30 minutes.

Notice

Postoperative Care

  • ● You may be discharged on the same day or the day after the ILR implantation.
  • ● Keep the wound clean and dry. Avoid getting the dressing wet during bathing. Replace the dressing if it becomes wet or dirty.
  • ● Sutures are typically removed about one week after the procedure. The dressing can usually be removed 2–3 days after that.
  • ● Avoid placing strong electromagnetic sources (e.g. mobile phones) within 15 cm (6 inches) of the device. Most household electronics are safe.
  • ● Follow your doctor’s advice and the manufacturer’s instructions regarding device care and safety.
  • ● Some models come with a handheld activator. If provided, use it to manually record symptoms when they occur./span>
  • ● Your healthcare team will show you how to use the activator and how to transmit data if remote monitoring is available.
  • ● If the ILR detects a cause for your symptoms, your doctor may recommend device removal and appropriate treatment.
  • ● The device may be removed or replaced once the battery is depleted, depending on your condition.

For further information, please consult your attending doctor or cardiologist.

The above information is for reference only. As each patient’s condition may vary, please consult your doctor for individual assessment and advice.