61-year-old male known case of ESRD brought to emergency department due to one episode of syncope.

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Regular wide complex tachycardias can be either ventricular (VT) or supraventricular (SVT with aberrancy) in origin, and differentiation between the two is usually challenging.
Since QRS morphologies in the sinus rhythm are the same as in the broad complex tachycardia, an SVT with aberrancy is more likely than VT.

This correct answer is “Supra-ventricular tachycardia with RBBB”

43-year-old female with history of unknown heart surgery in the childhood presented with sudden onset palpitation and confusion. Due to hemodynamic instability, cardioversion shock was performed and successfully restored its sinus rhythm, which is shown in the next slide.

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After cardioversion