Zio XT remote ambulatory cardiac monitor recommended by NICE | Discover more here

Patient information

Designed with

you in mind

Why has my Doctor registered me with Zio XT?

Proven to detect irregular heart rhythms quickly and accurately

Zio is a cardiac monitoring service that is proven to detect irregular heart rhythms quickly and accurately. Because Zio is so discreet and comfortable, you can continue with your daily activities, even showering and exercising, assured that Zio is capturing every heartbeat.

Do you sometimes experience a skipped beat in your chest? Or feel a racing of the heart?
Your heart might beat too slow, too fast, or with an irregular beat. It may feel like skipped beats or a brief pause. It might be so slight that you don’t even feel it or experience any symptoms. You may have an irregular heartbeat or an arrhythmia. Fortunately, there are treatments available for arrhythmias. However before you can begin treatment, the condition must be diagnosed.

A simple, one-time test with the Zio by iRhythm system could be all you need to find out whether or not you have an arrhythmia and what kind you have. Your doctor can then use this data to prescribe the most effective form of treatment.

What causes arrhythmias, or irregular heart rhythms?
Arrhythmias may be caused by many different factors, including prior heart attack or heart disease, high blood pressure, diabetes or sleep apnoea. Irregular heart rhythms can also occur in “normal, healthy” hearts. In the UK, 2 million people a year experience an arrhythmia or heart rhythm problem.

What is atrial fibrillation (AFib)?
Atrial fibrillation (also called AFib or AF) is a quivering or irregular heartbeat (arrhythmia) that can lead to blood clots, stroke, heart failure and other heart-related complications.

Normally, your heart contracts and relaxes to a regular beat. In atrial fibrillation, the upper chambers of the heart (the atria) beat irregularly (quiver) instead of beating effectively to move blood into the ventricles.

For more information, visit Arrhythmia Alliance and the NHS website.

You can use the interactive AFib Risk Assessment tool to help estimate your risk of AFib.

An electrocardiogram — abbreviated as ECG — is a test that measures the electrical activity of the heartbeat. With each beat, an electrical impulse (or “wave”) travels through the heart. This wave causes the muscle to squeeze and pump blood from the heart. A normal heartbeat on ECG will show the timing of the top and lower chambers. For more information please visit the NHS website.

An ambulatory ECG records the electrical activity of your heart while you are doing your normal everyday activities.

“Ambulatory” means that you are able to stand and walk, and are not stationary or motionless. Many heart problems are only detectable during activity such as standing or walking and will not appear in a brief test in your doctor’s office.

1Turakhia, M., et al. (2013). Diagnostic Utility of a Novel Leadless Arrhythmia Monitoring Device. The American Journal of Cardiology.

Our solution

Continuous, uninterrupted monitoring

Zio Xt Patient-friendly monitor

The Zio service was designed specifically to facilitate high patient compliance and allow data to be recorded uninterrupted and continuously for up to 14 days.


No gaps in data due to patient-centric design


Convenient button to mark episodes


Patients can continue daily activities while wearing the Zio monitor, including showering and exercising.

Artificial Intelligence (AI) and our Zio deep learning algorithm

Developed in collaboration with the Stanford Machine Learning Group, our deep neural network can detect and identify 10 arrhythmia classes. Combining deep learning and classic machine learning capabilities with our expert cardiac technician review, Zio by iRhythm gives physicians and patients the assurance of expert-level accuracy in arrhythmia detection.


10 arrhythmias classified


Faster diagnosis and accelerated patient care


Faster diagnosis and accelerated patient care


    After the comfortable, easy-to-wear Zio monitor is applied, the Zio patch records and stores every single heartbeat.
    These recordings are analysed by a powerful Zio system that identifies any irregular rhythms you’ve experienced—how many, what type, and when. In a study, physicians were able to reach a diagnosis of 90% of the time with the Zio system2.
    Your doctor receives a clear report that shows how many and what types of irregular heart rhythms you experienced, as well as your normal heart rhythm, and when they happened — all to help determine the best course of treatment.
2Barrett, P., et al. (2014). Comparison of 24 Hour Holter Monitoring Versus 14 Day Novel Adhesive Patch Electrocardiographic Monitoring. American Journal of Medicine.






The Zio ambulatory cardiac monitor is a small, unobtrusive, and water-resistant patch—you might even forget you’re wearing it. The Zio monitor records and stores every beat of your heart, whether you’re sleeping, working out, or showering.

The Zio monitor can be comfortably worn for up to 14 days. Holter monitors can be worn for 24 to 48 hours, limiting the time to record any irregular heart rhythms you may have. Zio is able to capture data for the 51% of patients who have their first symptom-triggered arrhythmia after 48 hours.

1Turakhia, M., et al. (2013). Diagnostic Utility of a Novel Leadless Arrhythmia Monitoring Device. The American Journal of Cardiology.

Frequently asked questions

Have questions about Zio XT?

What should I do while wearing Zio?

For the first 24 hours post application, please avoid getting the Zio monitor wet or sweating excessively, i.e. during exercise. After that, carry on with regular activities. You can shower and exercise after the first 24 hours. Wear the Zio monitor for the length of time advised by your physician, but no longer than 14 days. The Zio monitor is recording and storing every heartbeat while you are wearing it. Your physician uses this data, analysed by iRhythm, to determine the right course of action for you. While working properly, the monitor will not flash or make any sound. If you have any questions, please call iRhythm Customer Services Team on 0808 189 3411.

How do I record a symptom?
The Zio monitor is designed to record every heartbeat. While the Button Press Log is useful, pressing the button indicates that you felt symptoms at that time. Pressing the button on the Zio monitor when you feel a symptom is important, but the Zio monitor records every heartbeat whether you press the button or not. While recording the Zio monitor will not flash or make any sound. You can ensure it is active and recording by holding down on the button for 10 seconds. A green light will flash indicating it is working, and don’t worry, this won’t be recorded as a symptom.
What do I do with the Zio monitor after wear?
At the end of your instructed wear time it’s very important for you to send it to iRhythm Technologies the day you remove the monitor, so we can analyse your heart activity recorded by the monitor and provide the doctor your comprehensive Zio report. First, follow the monitor removal directions in your Patient Instructions and Button Press Log booklet. Then, simply place the Zio monitor in the convenient postage pre-paid return box, and post it back to us. The return address is already printed on the box. Please be sure to use the blue sticker included in the box to seal the box shut before sending it back to iRhythm.
Who do I call if I have any questions?

Call our customer services team on 0808 189 3411

Want to find out more?

Patient resources

NationAl Health Service

Arrhythmias or heart rhythm problems are experienced by more than 2 million people a year in the UK. Most people with an abnormal heart rhythm can lead a normal life if it is properly diagnosed.

Arrhythmia Alliance

Working together to improve the diagnosis, treatment and quality of life for all those affected by arrhythmias.


Strokes Association

We’re working tirelessly to support the NHS and develop new ways to help stroke survivors rebuild their lives during these difficult times.



Where can I get the Zio service?

The Zio system is available in both the private sector and the NHS. Please fill out the short form and a representative will follow up with you to appeal a convenient location.

iRhythm Technologies Ltd.
Seal House
56 London Road
Surrey GU19 5HL

Customer services team
0808 1893411