What ECG feature indicates a diagnosis of Ventricular Tachycardia?

Ventricular Tachycardia (VT) is characterized by specific features on an ECG, with precordial concordance being one of the hallmark characteristics. In VT, the QRS complex is typically wide and consistent, and when observed in precordial leads (such as V1 through V6), the direction of the QRS complexes will often be the same (all positive or all negative). This pattern indicates that the electrical impulse is originating from the ventricles and propagating throughout the heart in a coordinated manner, which is distinct from other arrhythmias where the QRS morphology may vary across the precordial leads.

Recognizing precordial concordance is crucial in diagnosing VT, as it signifies a consistent electrical activity that can help differentiate it from other tachyarrhythmias, like supraventricular tachycardia with aberrant conduction. This feature supports the diagnosis by demonstrating that the ventricular depolarization is occurring uniformly, as would be expected in a reentrant tachycardia pattern originating from within the ventricles.

For context, while inverted T waves, QRS duration changes, and short PR intervals may be associated with other cardiac conditions or arrhythmias, they do not specifically indicate Ventricular Tachy