Supraventricular tachycardia causes episodes of a pounding heartbeat (palpitations) that begin and end abruptly. Supraventricular tachycardia is a broad term that includes arrhythmias that start above the lower heart chambers (ventricles). Atrial flutter is similar to A-fib, but heartbeats are more organized. A-fib is associated with serious complications such as stroke. The condition may be temporary, but some A-fib episodes may not stop unless treated. Chaotic heart signaling causes a rapid, uncoordinated heart rate. The resting heart rate is less than 60 beats a minute.
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