It can be either.
Width of the QRS complexes depends on the location of the block. If the block is in the first part of the AV node, the ventricles are stimulated normally by a junctional pacemaker and the QRS complexes are narrow unless the patient has an underlying bundle branch block.
If the block is below the bundle of His, the ventricles are paced by an idioventricular pacemaker, producing wide QRS complexes.
Source
Goldberger: Clinical Electrocardiography: A Simplified Approach, 7th ed.
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