Electrophysiological Diagnosis of Narrow and Wide Complex Tachyarrhythmias

Establishing the precise mechanism of cardiac arrhythmias in the electrophysiology laboratory is one of the main requisites for a successful and safe ablation. The present article provides an organized approach to the differential diagnosis of narrow and wide complex tachycardias based on the analysis of electrical activation patterns followed by specific pacing maneuvers in each case.