What electrocardiographic findings help differentiate between the common SVTs?

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To distinguish the two types of supraventricular Tachycardias, electrocardiographic (ECG), findings can reveal more information about the cause. Atrioventricular reentry tachycardia, also known as AVRT, is often associated with a small QRS complex and frequent P waves. These can be observed in leads I, II or III of the ECG. However, Atrioventricular Nodal Reentry Tachycardia (AVNRT), tends to be more complex and are sometimes irregularly placed.

Additionally, sinus node reentrant tachycardia (SNRT) is usually characterized by a normal sinus rhythm and short PR intervals while orthodromic reciprocating tachycardia/Wolff-Parkinson-White syndrome typically displays an abnormal axis along with an antegrade conduction over accessory pathways as seen on the ECG. These parameters can be used to help clinicians develop more effective treatments.