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Learn the S-ICD Difference

How the S-ICD Works

Like other implantable cardioverter defibrillators (ICDs), your S-ICD continuously monitors your heart rhythm, 24 hours a day. It’s always on call. If your S-ICD detects a heart arrhythmia (abnormal rhythm) problem, it sends out an electrical shock to correct it.

The experience of receiving a shock can differ for each person; some may find the shock reassuring, others may feel anxious after shock therapy is delivered. Some people recover more quickly than others. Be sure to talk with your healthcare provider so that you thoroughly understand all of the risks and benefits associated with the implantation of an S-ICD.

It’s possible that you’ll experience a shock at some point during your time with an S-ICD. Different people feel these shocks differently. Because many patients faint or become unconscious shortly after a very fast heart rhythm starts, they do not feel these high-energy shocks. Those who are conscious sometimes describe the shock as a “kick in the chest.” The sensation lasts for a second.

An S-ICD Works Even If You Feel No Symptoms

An S-ICD Works Even If You Feel No Symptoms

Many people who experience abnormal heart rhythms (arrhythmias) feel nothing unusual when these episodes are happening. Even if you feel no symptoms, your S-ICD is designed to deliver lifesaving defibrillation (an electric shock) based on what it senses.

Find a Doctor

Find a doctor.

An S-ICD is a defibrillator implanted subcutaneously without leads touching the heart. Use the hospital locator tool to find S-ICD follow up centres and physicians trained in the S-ICD technology.

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Patient Stories

Meet real patients as they share their stories about living with an S-ICD.


The law restricts these devices to sale by or on the order of a physician. Indications, contraindications, warnings and instructions for use can be found in the product labelling supplied with each device. Information for the use only in countries with applicable health authority product registrations.Content of this website is for Information Purposes only and not meant for product promotion or medical diagnostic. This information does not constitute medical or legal advice, and Boston Scientific makes no representation or warranty regarding this information or its completeness, accuracy or timeliness.
Accordingly, Boston Scientific strongly recommends that you consult with your physician on all matters pertaining to your health or to address any questions.