If you've had ventricular arrythmias, you may have a small electrical device called an implantable cardioverter defibrillator (ICD) surgically implanted in your chest. Mild arrhythmias can usually be controlled with medicine such as beta blockers. However, survival rates have improved significantly since the invention of the portable defibrillator – an external device that delivers an electric shock to the heart and "resets" it to the right rhythm. These life-threatening types of arrhythmia can be a major cause of death during the 24 to 48 hours after a heart attack. ventricular arrhythmia, where the heart begins beating faster before going into a spasm and stops pumping completely this is known as sudden cardiac arrest.complete heart block, where electrical signals are unable to travel from one side of your heart to the other, so your heart cannot pump blood properly.Other arrhythmias can be life threatening, including: heart palpitations – the sensation of your heart pounding, fluttering or beating irregularly, felt in your chest or throat.Damaged muscles disrupt electrical signals that control the heart.
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