What electrocardiographic findings help differentiate between the common SVTs?

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Certain features can help differentiate the various supraventricular tachycardias. Atrioventricular reentry tachycardia is associated with a narrower QRS and regular P wave patterns that can appear in the leads I, V1, II, III or IV of an ECG. The atrioventricular reentry nodal (AVNRT), on the other hand tends towards wider QRS and irregularly spaced P waves.

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. Ultimately, examining these variables allows clinicians to better understand the differences between SVT types.