Narrow QRS tachycardia: Orthodromic reciprocating tachycardia using an accessory pathway in Wolff-Parkinson-White syndrome
Narrow QRS tachycardia: Orthodromic reciprocating tachycardia using an accessory pathway in Wolff-Parkinson-White syndrome
Activation is as follows: atrioventricular node, His-Purkinje system, ventricle, accessory pathway, atria. The P wave closely follows the QRS complex; it is a short RP interval tachycardia (PR > RP).