Insertable Cardiac Monitor

Safety and use information

Safety and Use

Find important safety and use information for our implantable devices.

Frequently Asked Questions (FAQs)


Find answers to your questions about cardiac arrhythmias.

What Is an Insertable Cardiac Monitor?

An insertable cardiac monitor provides valuable diagnostic information to your doctor, allowing your doctor to monitor your heart rhythm over a longer length of time than is provided by other tests or monitors. This can help your doctor diagnose heart events that may cause symptoms such as an irregular heart rhythm (arrhythmia), or determine if there is a heart-related reason for unexplained fainting (syncope).

Continuous heart monitoring with less interruptions to your daily life

The cardiac monitor is inserted just under the skin. After the insertion procedure, the device continuously monitors heart rhythms and records them automatically. In addition, you can record and annotate symptoms, such as fainting or palpitations, using the myMerlin™ app on your smartphone.

Traditional ICMs send data about your heart rhythm to a cumbersome bedside transmitter, which then sends the information to a portal that your doctor accesses. With these traditional ICMs, you will also need a separate handheld activator to record symptoms on demand.

Our Confirm Rx™ insertable cardiac monitor—the slimmest ICM available—is the first-and-only such monitoring system to eliminate the need for a bulky bedside transmitter and separate activator.

Live life, less interrupted. No bulky transmitter or awkward, handheld activator means monitoring your heart is easy, effective and discreet.


Confirm Rx ICM provides an all-in-one integrated transmitter and symptom recorder, functional via the myMerlin™ smartphone app. The app lets you record symptoms on demand, view transmissions and symptom history, and send information to your clinic without having to wait for a nightly sync.

Is the Confirm Rx™ insertable cardiac monitor right for you?

If you experience one or more of the following symptoms, your doctor may prescribe an insertable cardiac monitor.

Unexplained fainting

Also known as syncope, fainting occurs when there is a temporary loss of blood flow to the brain that causes a brief loss of consciousness. Fainting can occur for a number of reasons, including dehydration or heat exhaustion.

If the cause of your fainting is not readily apparent, your doctor may recommend heart monitoring to help determine if the cause of your fainting spells is heart related. Consult your doctor if you or a loved one is experiencing unexplained fainting episodes.

Heart palpitations

Heart palpitations often give the feeling of a pounding, fast or irregular heartbeat. Palpitations can be caused by anxiety, stress, physical exertion or certain medications. Sometimes, palpitations can signal an abnormal heart rhythm, also known as an arrhythmia.

If accompanied by the following symptoms, palpitations may signal a more serious problem:

  • Difficulty breathing or shortness of breath
  • Pain, discomfort or tight feeling in the chest, arms or jaw
  • Fainting/loss of consciousness
  • Lightheadedness, dizziness or feeling like you are going to faint
  • Unusual or excessive sweating

Consult your doctor if you or a loved one is experiencing heart palpitations. Learn more about the diagnostic tests your doctor can use to determine if the underlying cause of your palpitations is heart related.

Fast heartbeat

Fast heartbeat, also known as tachycardia, is a heartbeat above 100 beats per minute. Sometimes a heart rate above 100 beats per minute is normal. Other times, a heart rate greater than 100 beats per minute is the result of a problem with the heart or the irregular electrical signals in the heart.

There are several kinds of tachycardias. Atrial fibrillation, also known as AF or AFib, is the most common and is a progressive condition. If not treated, AF can worsen, and side effects may lead to stroke or heart failure. In fact, people with AF are five times more likely to experience a stroke.1 In order to monitor your heartbeat continuously, your doctor may prescribe an ICM.

Learn more about fast heartbeat and the different types of tachycardias.

Slow heartbeat

Slow heartbeat, also known as bradycardia, is a heartbeat of less than 60 beats per minute. Sometimes a resting heart rate below 60 beats per minute does not signal a problem, but some instances of slow heartbeat are life threatening. If you are concerned about a slow heartbeat, consult your doctor.

Learn more about slow heartbeat or bradycardia.

Cryptogenic stroke

A cryptogenic stroke is a stroke with no known cause. Between 30 and 40 percent of ischemic strokes are considered cryptogenic.2 Of those who have experienced a stroke, 25 to 35 percent will experience a second stroke.3 It is believed that a second stroke can be prevented 80 percent of the time with medical treatment and lifestyle adjustments.2

An ICM may provide valuable diagnostic information to your doctor to help find the underlying cause of a stroke. Contact your doctor to discuss the relationship between strokes and your heart.

The St. Jude Medical commitment to safe, reliable and effective cardiac monitoring

Since the first implantable pacemaker was developed in 1958, millions have benefited from pacemaker therapy. The remarkable story of the first cardiac pacemaker is embedded in St. Jude Medical’s history, and today, St. Jude Medical continues its commitment to revolutionizing arrhythmia detection and management with our insertable cardiac monitor, Confirm Rx™ ICM.

Confirm Rx™ Insertable Cardiac Monitor


Confirm Rx™ Insertable Cardiac Monitor

Learn about the world’s first smartphone-enabled ICM and how you can monitor your symptoms and send information straight to your clinic with an easy-to-use smartphone app.


Apple is a trademark of Apple, Inc.
Android is a trademark of Google, Inc.
Bluetooth is a registered trademark of Bluetooth SIG, Inc.
Wi-Fi is a trademark of Wi-Fi Alliance.
Limitations: Patients my use their own Apple or Android mobile device to transmit information from their Confirm Rx™ ICM using the myMerlin™ mobile app. To do so, the device must be powered on, app must be installed, Bluetooth® wireless technology enabled and data coverage (cellular or Wi-Fi) available. The myMerlin™ app provides periodic patient monitoring based on clinician-configured settings. Transmission data is resent if not sent successfully. However, there are many internal and external factors that can hinder, delay or prevent acquisition and delivery of ICM and patient information as intended by the clinician. These factors include: patient environment, data services, mobile device operating system and settings, ICM memory capacity, clinic environment, schedule/configuration changes or data processing.
1. American Stroke Association. (2016). When the beat is off—atrial fibrillation. Retrieved from
2. American Stroke Association. (2016). Cryptogenic stroke initiative. Retrieved from
3. National Stroke Association. (2016). Preventing another stroke.