A post CABG patient shows a monomorphic wide QRS tachycardia, what is the confirmed diagnosis based on the atrial electrogram?

In a post-CABG patient presenting with monomorphic wide QRS tachycardia, the confirmed diagnosis is ventricular tachycardia, particularly when evaluated alongside the atrial electrogram. Ventricular tachycardia is characterized by a distinct pattern where the QRS complexes appear wide and uniform, which corresponds to the ventricles initiating the rapid heart rhythm independently of atrial activity.

In this scenario, the presence of a monomorphic nature of the QRS complexes indicates that the rhythm is originating from a single abnormal focus within the ventricles rather than being the result of varying or multiple foci as seen in other arrhythmias. Additionally, unlike atrial flutter, sinus tachycardia, or SVT with aberrant conduction, ventricular tachycardia may not show consistent atrial activity associated with the ventricular rate, supporting the diagnosis in the context provided.

The distinction from the other conditions is crucial: atrial flutter typically shows a sawtooth pattern (F-waves), sinus tachycardia manifests with narrow QRS complexes and is driven by increased pace from the sinus node, and SVT with aberrant conduction produces wide QRS complexes that are often not uniform. Thus, the identification of monomorphic wide QRS