The differential diagnosis of a regular, monomorphic wide QRS complex tachycardia (WCT) mechanism represents
a great diagnostic dilemma commonly encountered by the practicing physician, which has important implications
for acute arrhythmia management, further work-up, prognosis and chronic management as well. This comprehensive review
discusses the causes and differential diagnosis of WCT, and since the ECG remains the cornerstone of WCT differential
diagnosis, focuses on the application and diagnostic value of different ECG criteria and algorithms in this setting
and also provides a practical clinical approach to patients with WCTs.