A 52-year-old man with no prior cardiac history presents with palpitations. His 12-lead ECG shows a regular rhythm with alternating sinus beats and wide QRS complexes of bizarre morphology. The rhythm strip labeled **B** demonstrates ventricular bigeminy. Which of the following ECG findings is MOST characteristic of the premature ventricular complexes (PVCs) in this pattern and helps distinguish them from premature atrial complexes (PACs)?
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