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DIFFICULTY: HARD
A 55-year-old male patient presents to the emergency department with complaints of palpitations and dizziness. He has a history of hypertension and occasional palpitations but has never experienced such severe symptoms before. The attending physician suspects either ventricular tachycardia or supraventricular tachycardia with aberrant conduction. Which of the following clinical features is not useful in differentiating between the two conditions?
A
B
C
D
E