FAQs on Implantable Loop Recorders

Frequently Asked Questions

What is an implantable loop recorder?

An implantable loop recorder, or ILR, is a small device that cardiologists implant just under the skin of the chest to monitor your heart activity and look for causes of fainting, palpitations, very fast or very slow heartbeats, or hidden rhythms that can cause strokes. The device itself is only 61mm x 19mm x 8mm and weighs 0.5 ounces.

How does it work?

After a loop recorder has been implanted in your chest, it works like a portable electrocardiogram (ECG), continuously picking up the electrical signal from your heart and storing the data for further study. It automatically starts recording if your heart rate drops below the lowest level or soars above the highest level of the range set by your physician. The recorder can also be activated through a “patient activator” button. A patient may trigger the button if they are experiencing symptoms such as skipped heart beats, lightheadedness, or dizziness. All recorded information is stored on the device until uploaded by the physician.