In which scenario would you most likely see a wide QRS complex?

A wide QRS complex is typically indicative of abnormalities in the ventricular conduction system. In the context of ventricular tachycardia, this is particularly relevant. This arrhythmia arises from the ventricles themselves, and it alters the normal conduction pathways, leading to an increased duration of the QRS complex due to delayed depolarization. Consequently, the QRS duration often exceeds 0.12 seconds.

In contrast, normal sinus rhythm and junctional rhythms typically display narrow QRS complexes, reflecting normal conduction pathways through the ventricles. Atrial flutter does not inherently cause a wide QRS complex either, as it primarily originates from the atria, and if the ventricles conduct normally, the QRS complex remains narrow. Thus, the presence of a wide QRS complex is mainly associated with ventricular tachycardia, making it the correct scenario for this question.