Which arrhythmia is often described by "broad and bizarre" QRS complexes?

Ventricular tachycardia is characterized by "broad and bizarre" QRS complexes due to the fact that the impulse originates in the ventricles rather than the normal conduction pathways. This dysregulated electrical activity results in QRS complexes that have a greater duration than those seen in normal sinus rhythm, typically greater than 120 milliseconds, leading to the broad appearance. Additionally, the morphology of these complexes can appear unusual or abnormal due to the different activation patterns within the ventricles. This gives ventricular tachycardia its distinctive clinical and electrocardiographic presentation, differentiating it from other arrhythmias where the QRS complexes are typically narrow and more uniform in appearance.