An implantable cardioverter-defibrillator (ICD) is a device that detects a life-threatening, rapid heartbeat. This abnormal heartbeat is called an arrhythmia. If it occurs, the ICD quickly sends an electrical shock to the heart. The shock changes the rhythm back to normal. This is called defibrillation.
An ICD is made up of these parts:
A cardiologist or surgeon most often will insert your ICD when you are awake. The area of your chest wall below your collarbone will be numbed with anesthesia, so you will not feel pain. The clinician will make an incision (cut) through your skin and create space under your skin and muscle for the ICD generator. In most cases, this space is made near your left shoulder.
The clinician will place the electrode into a vein, then into your heart. This is done using a special x-ray to see inside your chest. Then the clinician will connect the electrodes to the pulse generator and pacemaker.
The procedure most often takes 2 to 3 hours.
Some people with this condition will have a special device that combines a defibrillator and biventricular pacemaker placed. The pacemaker device helps the heart to beat in a more coordinated fashion.
An ICD is placed in people who are at high risk of sudden cardiac death from an abnormal heart rhythm that is life threatening. These include ventricular tachycardia (VT) or ventricular fibrillation (VF).
Reasons you may be at high risk are:
Risks for any surgery are:
Possible risks for this surgery are:
An ICD sometimes delivers shocks to your heart when you do not need them. Even though a shock lasts a very short time, you can feel it in most cases.
This and other ICD problems can sometimes be prevented by changing how your ICD is programmed. It can also be set to sound an alert if there is a problem. The doctor who manages your ICD care can program your device.
Always tell your health care provider what drugs you are taking, even drugs or herbs you bought without a prescription.
The day before your surgery:
On the day of the surgery:
You will be told when to arrive at the hospital.
Most people who have an ICD implanted are able to go home from the hospital in 1 day. Most quickly they return to their normal activity level. Full recovery takes about 4 to 6 weeks.
Ask your provider how much you can use the arm on the side of your body where the ICD was placed. You may be advised not to lift anything heavier than 10 to 15 pounds (4.5 to 6.75 kilograms) and to avoid pushing, pulling, or twisting your arm for 2 to 3 weeks. You may also be told not to raise your arm above your shoulder for several weeks.
When you leave the hospital, you will be given a card to keep in your wallet. This card lists the details of your ICD and has contact information for emergencies. You should always carry this wallet card with you.
You will need regular checkups so your ICD can be monitored. The provider will check to see if:
Your ICD will constantly monitor your heartbeats to make sure they are steady. It will deliver a shock to the heart when it senses a life-threatening rhythm. Most of these devices can also work as a pacemaker.
Al-Khatib SM, Stevenson WG, Ackerman MJ, et al. 2017 AHA/ACC/HRS guideline for management of patients with ventricular arrhythmias and the prevention of sudden cardiac death: a report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines and the Heart Rhythm Society. J Am Coll Cardiol. 2018;72(14):e91-e220. PMID: 29097296 pubmed.ncbi.nlm.nih.gov/29097296/.
Chung MK, Daubert JP. Pacemakers and implantable cardioverter-defibrillators. In: Libby P, Bonow RO, Mann DL, Tomaselli GF, Bhatt DL, Solomon SD, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 12th ed. Philadelphia, PA: Elsevier; 2022:chap 69.
Epstein AE, DiMarco JP, Ellenbogen KA, et al. 2012 ACCF/AHA/HRS focused update incorporated into the ACCF/AHA/HRS 2008 guidelines for device-based therapy of cardiac rhythm abnormalities: a report of the American College of Cardiology Foundation/American Heart Association Task Force on practice guidelines and the Heart Rhythm Society. J Am Coll Cardiol. 2013;61(3):e6-e75. PMID: 23265327 pubmed.ncbi.nlm.nih.gov/23265327/.
Miller JM, Ellenbogen KA. Therapy for cardiac arrhythmias. In: Libby P, Bonow RO, Mann DL, Tomaselli GF, Bhatt DL, Solomon SD, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 12th ed. Philadelphia, PA: Elsevier; 2022:chap 64.
Pfaff JA, Gerhardt RT. Assessment of implantable devices. In: Roberts JR, Custalow CB, Thomsen TW, eds. Roberts and Hedges' Clinical Procedures in Emergency Medicine and Acute Care. 7th ed. Philadelphia, PA: Elsevier; 2019:chap 13.BACK TO TOP
Review Date: 10/5/2022
Reviewed By: Thomas S. Metkus, MD, Assistant Professor of Medicine and Surgery, Johns Hopkins University School of Medicine, Baltimore, MD. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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