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These have abnormal P waves; a junctional extrasystole either has no P wave at all, or it may occur immediately before or immediately following the QRS complex.
A patient with atrial or nodal extrasystoles will have an ECG with QRS complexes that are the same of those of sinus rhythm.
ECG findings are that a nodal extrasystole has no P wave; an abnormal shaped P wave is present in an atrial extrasystole.