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Change in Heartbeat - Topic Overview

Fast heart rhythms that begin in the lower chambers of the heart are called ventricular arrhythmias. They usually are fast and regular, such as ventricular tachycardia, or fast and irregular, such as ventricular fibrillation. These types of heart rhythms make it hard for the heart to pump enough blood to the brain or the rest of the body and can be life-threatening. Ventricular arrhythmias may be caused by heart disease such as heart valve problems, impaired blood flow to the heart muscle (ischemia or a heart attack), a weakened heart muscle (cardiomyopathy), or heart failure.

Ventricular tachycardia is a life-threatening arrhythmia that can quickly lead to ventricular fibrillation, which causes death if not treated. Both usually cause fainting (syncope) within seconds, and you may have symptoms of a heart attack. Emergency medical treatment is needed, such as medicines and electrical shock (defibrillation).

When you have a change in your heart rhythm or rate, you also may have other symptoms, such as chest pain, shortness of breath, lightheadedness, fainting, confusion, or weakness. Changes in your heart rate or rhythm with other symptoms can be caused by a serious heart problem.

Taking illegal drugs (such as stimulants, like cocaine or methamphetamine) or misusing prescription and nonprescription medicines can cause serious heart rhythm or rate changes and may be life-threatening.

The U.S. Food and Drug Administration (FDA) has banned the sale of ephedra, a stimulant sold for weight loss and sports performance, because of concerns about safety. Ephedra has been linked to heart attacks, strokes, and some sudden deaths.

Check your symptoms to decide if and when you should see a doctor.

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WebMD Medical Reference from Healthwise

Last Updated: September 13, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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