As a general and precautionary rule, any arrhythmia somewhat higher than, or substantially higher than 100-140 BPM ought to be seen for urgent care. So, an ER visit in all probability. But a lot depends on which of the 14 non-bradycardia arrhythmias we're talking about. For example, ventricular tachycardia/fibrillation is potentially lethal, quickly. Atrial fibrillation is not lethal, although it can soon cause problems which are. SVTs and PACs (premature atrial complexes) are common for all hearts for very short runs every once in a while, so no real issue.

So, with all that, any tachyarrhythmia that has your heart beating more than 100 BPM for 24 hours should be managed at a health facility. And that's only if you know for a fact that it is atrial and not ventricular.