An implantable loop recorder (ILR) is a heart recording device. It's implanted in the body under the chest skin. It has several uses. The most common ones include looking for causes of fainting, palpitations, very fast or slow heartbeats, and hidden rhythms that can cause strokes. Loop recorder implantation is considered a minor procedure. For the procedure, your heart healthcare provider (cardiologist) places the small device under your skin, in your chest wall, overlying the heart. The machine works as an electrocardiogram (ECG). It constantly picks up electrical signals from your heart and records anything abnormal. This can help identify heart rhythms that can cause problems, such as fainting.
Normally, a special group of cells initiate the electrical signal to start your heartbeat. These cells are in the sinoatrial node. This node is in the upper right chamber of your heart (right atrium). The signal quickly travels down your heart’s conducting system to the ventricles. These are the two lower chambers of your heart. As it travels, the signal sets off nearby parts of your heart to contract. This helps your heart pump blood in a coordinated way.
Any disruptions to this signaling pathway may result in heart rhythm problems. These might cause problems, such as fainting and palpitations. An abnormal heart rhythm (arrhythmia) may make your heart unable to pump as much blood as needed. If blood flow to your brain is reduced for a short time, you may faint. When the rhythm returns to normal, blood flow is restored and you normally regain consciousness.
An implantable loop recorder constantly records information about your electrical activity, similar to an ECG. But an ILR can record heart rhythm for up to 3 years. This is particularly useful if your arrhythmia doesn't occur often. An ILR is constantly looping its memory. And it has automatic triggers to store recordings. It can also be patient-activated to store recordings as well. If you fainted due to an arrhythmia, the machine records this information before, during, and after the fainting. Then a healthcare provider can look at the recordings to figure out the cause. Most current ILRs have a home monitor that can send data to your healthcare provider.
You might need an ILR if you have fainting episodes or palpitations, and other tests haven't yet given you any answers. Each heart rhythm problem may need its own treatment. It’s important to find out what kind of problem you may have, if any. Repeated fainting can have a negative effect on your physical and emotional health. Also some kinds of fainting greatly increase your chance for sudden death. These fainting episodes need diagnosis and treatment as soon as possible. Once you're diagnosed, you may need a pacemaker or an implantable cardioverter-defibrillator. These could save your life. You might also need a loop recorder if your healthcare provider wants to look for very fast or slow heartbeats. These abnormal heartbeats can cause palpitations or even lead to strokes.
Loop recorder implantation is often helpful if other tests haven’t found the cause. Your healthcare provider is more likely to advise it if your heart rhythm is a likely cause of your fainting. This is more common in older adults. It's also more common in people with other heart problems. You're also more likely to need loop recorder implantation if you are fainting often, but not enough for other kinds of heart rhythm monitoring to find your fainting. The loop recorder records for up to 3 years. So over time your provider should be able to analyze your heart rhythms during a fainting episode.
You also might need a loop recorder if you're an older adult with unexplained falls. Or if you've had a stroke without a clear reason. Sometimes arrhythmias are responsible for these conditions. Healthcare providers sometimes use it in people believed to have epilepsy who haven't responded to medicine. In each case, the recorder can figure out if an abnormal rhythm is the problem.
Most people have the procedure without any problems. But sometimes problems happen. These might include:
Your own risks will depend on your age, your other health conditions, and other factors. Ask your healthcare provider about any risks of the procedure for you.
Talk with your healthcare provider about what you should do to get ready for your procedure. Follow any directions you're given for not eating or drinking before your procedure. Follow your provider’s instructions about what medicines to take before the procedure. Don’t stop taking any medicine unless your provider tells you to do so. You might also need tests before the procedure, such as an ECG.
Ask your healthcare provider about what to expect during your procedure. Normally, you can expect the following:
Ask your healthcare provider about what to expect after your procedure. In most cases:
All loop recorders come programmed to record certain fast and slow heart rates. But they also come with a handheld activator that tells the loop recorder to save the signals collected over a certain time. This is important. It can also help explain if a fast or slow heartbeat isn't what's causing your problems. Someone will make sure you know how to use your activator before you go home.
Talk with your heart healthcare provider first if another healthcare provider wants you to get an MRI test. You can get an MRI with a loop recorder. But it may cause your device to display a false reading.
You may keep your loop recorder for up to 3 years. When you no longer need it, you may have it removed in a similar procedure.
Before you agree to the test or procedure make sure you know:
