Most people with this type of irregular heart rhythm have heart disease or have had a serious injury, such as being struck by lightning. Rapid, chaotic electrical signals cause the lower heart chambers to quiver instead of squeezing in a coordinated way. This serious condition can be deadly if the heart rhythm isn't reset within minutes. Supraventricular tachycardia causes episodes of a pounding heartbeat that begin and end abruptly. Supraventricular tachycardia is a broad term that includes irregular heart rhythms that start above the lower heart chambers. But episodes lasting more than a few seconds can be life-threatening. Episodes may be brief and last only a couple of seconds without causing harm. The fast heart rate doesn't let the ventricles fill and squeeze to pump enough blood to the body. This irregular heart rhythm starts in the lower heart chambers, called the ventricles. ![]() People who have atrial flutter also often have A-fib at other times. Episodes of atrial flutter may go away by themselves or may need treatment. Atrial flutter is similar to A-fib, but heartbeats are more organized. But some episodes won't end unless treated. Chaotic, irregular electrical signals start in the upper chambers of the heart, called the atria. ![]() This is the most common type of tachycardia.
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