Tachycardias

Tachycardias are arrhythmias in which the heartbeat speeds up to over 100 beats per minute. They're further classified by where in the heart they begin. This section discusses:

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• Atrial tachycardias, which occur in the atrium, or the upper portion of the heart
• Ventricular tachycardias, which begin in the ventricle, the lower portion of the heart