Marked sinus<unk>  or SA node exit block can result in an escape AV nodal or junctional<unk>  with narrow QRS complex at a rate of 40-60 beats per minute.
Junctional bradycardia EKG examples
Paroxysmal AV Block EKG examples
Premature ventricular contraction EKG examples
Intraventricular conduction delay EKG examples
Atrial fibrillation EKG examples
Junctional tachycardia ECG
Wide complex tachycardia laboratory findings
Wide complex tachycardia physical examination