AHA/ACCF/HRS Recommendations for the Standardization and Interpretation of the Electrocardiogram: Part III: Intraventricular Conduction Disturbances

February 19, 2009—The purpose of the present report is to define the normal QRS duration, review the recommendations made in 1985 (electrocardiography criteria for intraventricular conduction disturbances and ventricular preexcitation reviewed by an ad hoc working group established by the World Health Organization and the International Society and Federation of Cardiology), recommend alterations and additions to those recommendations, and provide recommendations for children and adolescents.