Purpose of Review: The purpose of the current mini-review is to describe the
importance of surface ECG for the diagnosis of conduction disorder.
Methods: The MEDLINE/PubMed database was used, with the keywords "ECG" and "conduction
disorders"; over the past 10 years. Other documents were included because of their relevance.
Main Findings: Data on the anatomy and function of the cardiac electrical system have been
described. Conduction disorders including sinus node dysfunction, atrioventricular blocks, intraventricular
conduction disorders are exposed as to their epidemiology, etiology, presentation, anatomical
site of impaired conduction of the electrical stimulus. The importance of ECG in patients
with a cardiac implantable electronic device was also discussed, in addition to future perspectives.
Conclusion: Surface ECG allows the diagnosis of atrioventricular and intraventricular conduction
disorder and its anatomical block site most of the time, without the need for invasive tests such as
electrophysiological study. Dysfunctions of cardiac implantable electronic devices can be diagnosed
by ECG, as well as the prediction of response to cardiac resynchronization therapy.