CaRi-heart technology
Revolutionary new technology to assess the risk of a serious heart condition or heart attack – many years before anything happens.
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An Implantable Loop Recorder (ILR) is a small, rectangular electronic device that's the size of two matchsticks stuck together. It’s inserted under the skin at the bottom of the breastbone on the left side of your chest.
The ILR records your heart's electrical activity, monitoring your heart rhythm and heart rate over a long period of time. This means it can find small changes in your heart rhythm that other tests may have missed.
By monitoring your heart in this way, our electrophysiology consultants, who are specialists in understanding and managing the heart's electrical activities, can find the cause of infrequent symptoms or heart rhythm problems.
Once inserted, the implant is invisible. It has no patches or wires, so it won’t interfere with your daily activities.
A cardiac loop recorder is around 45mm (1.5in) long, 7mm wide and 4mm deep. The case is made of metal and plastic and contains electrodes, electrical circuits and a battery.
As the ILR implant sits just beneath your skin, you might notice a faint outline if you’re slim. However, once it's in place, it shouldn’t cause you any pain or discomfort.
You might need an ILR if you're experiencing any of the following symptoms that can’t be explained by a routine ECG test:
The symptoms listed above can indicate several heart conditions. If you're experiencing any of them, it’s important to see a consultant as soon as possible. They may conduct tests to identify potential underlying causes and recommend an ILR implant if long-term monitoring is necessary.
ILR’s monitor your heart rate and rhythm and record abnormal electrical activity. The recorded information is stored in its memory but also transmitted to a secure monitoring network via your mobile phone using Bluetooth. This system is known as remote monitoring.
Our highly trained cardiac physiologists oversee the remote monitoring systems for many types of cardiac rhythm devices, reviewing the information with our cardiologists and medical teams.
Your implant will begin recording your heart’s activity automatically if it recognises something unusual. If you don’t have a compatible mobile phone, our cardiac physiologists will give you a transmitting device to put beside your bed. This device sends the information recorded by your ILR implant to our team at night.
You can record any symptoms you have using the app on your phone, so we can correlate this with any recordings made by the ILR implant.
The data that's captured by your ILR helps the team make an accurate diagnosis and decide on the best treatment plan. Once the doctors know what’s causing your symptoms, they may decide to start treatment and replace or remove the ILR. The battery of an implantable loop recorder lasts for four years but it can stay in place indefinitely, if you prefer.
Fitting an ILR is a minor surgery and it’s usually done on an outpatient basis. The procedure is carried out under local anaesthetic. A small incision is made in your chest and then the implant is injected under your skin.
You can find out more about the procedure in the sections below.
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Before your implant procedure
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During your implant procedure
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Immediately after your implant procedure
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How the loop recorder implant works
Your implant will begin recording your heart’s activity automatically if it recognises something unusual. If you notice any symptoms, you can record them using the app on your phone so we can correlate this with information from the ILR implant.
You’ll be given a follow-up appointment to see an electrophysiologist in the weeks after your ILR is fitted to make sure that it's working properly.
The data that's captured helps the team make an accurate diagnosis and your consultant can then decide on the best treatment plan. They may replace or remove the ILR.
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Once you've had loop recorder surgery, you may find that the site of the incision is bruised for a few days after having your ILR fitted, but this will gradually disappear.
To help with the recovery process, avoid strenuous activity for a few days and speak to your cardiologist about when you can get back to any sports. As the implant site will be bruised and sore, avoid touching or pressing anything against the site and the surrounding area until it’s healed.
You may not be able to drive if you’ve suffered faints or blackouts, or episodes of profound dizziness. Your cardiologist will advise on whether it’s safe for you to drive in those circumstances. Otherwise, once your wound has healed, you’ll be able to do everything that you did before you had the device fitted, including driving.
However, it’s best to wait a couple of days for the wound to heal before you drive or place a seatbelt over the site of your implant. If you find using a seatbelt uncomfortable after this time, you may find it helpful to use some extra padding over the site of the ILR.
If you visit a doctor for any kind of medical test, you must tell them that you’re fitted with an ILR. MRI scans are best avoided for the first six weeks after having your ILR fitted, but can still be performed if urgent.
If you need an MRI after six weeks have passed, you must let the MRI unit know about your implant in advance and you must also tell your cardiologist so that information on the device can be examined. This is because MRI scans usually wipe data from ILR devices.
There’s no need for any special precautions before having surgery, a general anaesthetic, or any other kind of medical treatment. If you visit your dentist, please tell them you have an ILR before receiving any treatment.
For most people, it’s safe to take part in sports and go to the gym with an ILR. You can also go swimming once the wound has healed. However, you should avoid direct impact on the site of the ILR. Although this is unlikely to damage the device, you might find it uncomfortable.
If you experienced symptoms before having your ILR fitted that prevented you from taking part in sports or physical activities, then it’s important to speak to your cardiologist before trying anything new.
You’ll be able to travel abroad and fly with an ILR implant fitted, although, ideally, you should attend your follow-up appointment with your cardiologist before doing so.
You can go through airport security scanners without a problem but, as the ILR is made of metal, it will cause an audible alert in metal detectors. You’ll be given a device identification card that you’ll need to show security staff when you’re travelling, as it tells them you’ve had an ILR fitted.
If you have a bedside monitor, we recommend you take it with you if you plan to travel for more than two weeks. The monitor will work anywhere where there’s a mobile phone signal, so your heart activity can still be monitored when you’re abroad.
“Dr Segal is a wonderful cardiologist with a wonderful manner. I would highly recommend him to anyone with heart issues.”
This content is intended for general information only and does not replace the need for personal advice from a qualified health professional.