SCA is an electrical problem with the heart that triggers a dangerously fast heart rate (ventricular tachycardia) or irregular rhythm (ventricular fibrillation). If not treated immediately, SCA can be fatal. Approximately 95% of people who experience an out-of-hospital cardiac arrest event and are not treated by defibrillation within 10 minutes will die.1
Julie suffered an SCA while celebrating her birthday and received an implantable cardioverter defibrillator (ICD). Watch the video to hear her story.
Steve suffered an SCA while golfing with his daughter and received an implantable cardioverter defibrillator (ICD). Watch the video to hear his story.
Think of your house: It needs plumbing and electricity to work as it should — and it has the potential for both plumbing and electrical problems. The same can happen with your heart. A heart attack is primarily a plumbing (blood flow) problem; SCA is an electrical (heart rhythm) problem.
SCA is a rhythm problem that prevents the heart from pumping blood to the brain and organs.
A heart attack is typically caused by a blockage in a blood vessel to the heart muscle. This can permanently damage part of the heart and can lead to cardiac arrest.
Survival rates can double or triple if more people take action and know how to respond in the case of an SCA1:
1. Call 911.
2. Administer CPR.
3. If available, use an automated external defibrillator (AED) to provide an electronic shock to the heart within minutes.
EF is a measurement of the percentage of blood pumped (or ejected) from the left ventricle in your heart with each beat. Understanding how well your blood is pumping can help your doctor diagnose and track heart failure and determine the right course of treatment for you.
If you are someone with a heart condition, it's important to know your EF. Ask your physician about your EF.
An AED is a portable device used by emergency response teams or the general public to shock the heart — giving the heart a chance to restart normal electrical activity and resume beating effectively.
An ICD is likely to be recommended for long-term treatment of irregular rhythms and prevention of SCA. The small, battery-powered device is surgically placed below the collarbone. One or more thin wires (leads) from the ICD run through the veins to the heart. The device constantly monitors the heart's rhythm so it can regulate the heart rate if it detects an irregular rhythm. It can send either high-energy shocks or low-energy, painless pacing stimulation to disrupt a dangerously fast heart rhythm.5
Learn how your smartphone or tablet could make your life with a heart device easier.
Visit Ask the ICD, an interactive website full of questions and answers about living with an ICD.
CPR Facts & Stats. American Heart Association. Available at: cpr.heart.org/en/resources/cpr-facts-and-stats. Accessed September 19, 2022.
Zipes DP, Roberts D. Results of the international study of the implantable pacemaker cardioverter-defibrillator. A comparison of epicardial and endocardial lead systems. The Pacemaker-Cardioverter-Defibrillator Investigators. Circulation. July 1995;92(1):59-65.
Volosin KJ, et al. Virtual ICD: A Model to Evaluate Shock Reduction Strategies. Presented at HRS 2010 (PO3-125).
Solomon SD, Anavekar N, Skali H, et al. Influence of ejection fraction on cardiovascular outcomes in a broad spectrum of heart failure patients. Circulation. December 13, 2005;112(24):3738-3744.
Sudden cardiac arrest. Mayo Clinic. Available at: mayoclinic.org/diseases-conditions/sudden-cardiac-arrest/diagnosis-treatment/drc-20350640. Accessed September 19, 2022.