The ventricular Pte excitation syndrome, Wolf Parkinson's white syndrome, comprises two ECG criteria plus a clinical criterion: A short PR interval Widened QRS complex Episodes of paroxysmal tachycardia. The PR interval is shortened by the rapid transmission of depolarisation from atrial to ventricular myocardium. The accessory pathway passes first to the upper part of the right side of the inter ventricular septum, and this is the first part of the myocardium to be activated (normally, the left side of the upper part of the inter ventricular is the first part of the ventricles to be activated).
This changes the initial direction of the QRS deflection. The initial part of the QRS complex is slurred and this premature, slurred initial portion is termed the delta wave , The normal pathways of intra-ventricular conduction are not followed and hence the QRS complex becomes distorted in…
