Fast heart rates from the top chamber of the heart are known as supraventricular tachycardia or SVT for short. These can occur from the top chamber or the bottom chamber of the heart. The electrical system of the heart itself can cause a fast heart rate if there are ‘short circuits’ that occur within it. The heart rate can be fast for reasons inside the heart or reasons outside the heart. Articles on normal heart rate and low heart rate are linked here. Each case is different and needs to be approached differently. Although a fast heart rate is commonly defined as a heart rate greater than 100 beats per minute, there is no specific cut off for what defines a significantly fast heart rate or a number above which a fast heart rate becomes an issue. A fast heart rate is known as tachycardia and commonly defined as a heart rate greater than 100 beats per minute.
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