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However, in majority of cases in this ECG strip atrial extrasystoles are concealed. The morphology of the normal T waves (white arrow) is considerably different from morphology of the T waves combined with “hidden” P waves of atrial extrasystoles (gray arrows). The duration of QRS complexes appearing after atrial premature beats in most cases is extended (Fig. 2). There is aberrant conduction via the distal conduction system (His-Purkinje) that is variable and resulting in different morphologies of the QRS complex.