Supraventricular Tachycardia<unk>  re-entry circuit
Defined by<unk>  rate of 250-350, classically 300<unk>  re-entry circuit
Atrial flutter
Can be difficult to distinguish from atrial fibrillation
Wide-complex tachycardia
Regular
Narrow-complex tachycardia
AV Node Independent
Atrial fibrillation 
Sinus tachycardia