Yes if sustained: Increase heart rates, sustained even for a short period of time can cause heart failure.
Answered 12/19/2012
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It depends: If one has intermittent short runs of atrial tachycardia, it might not be dangerous; sustained runs are of greater concern. More important is to determine the underlying cause of the arrhythmia. This entails knowing ones blood pressure, heart muscle and valve status (echocardiogram).
Answered 10/6/2019
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