Introduction Left bundle branch block (LBBB) can occur when there is a delay in or a block of conduction at several locations in the intraventricular conduction system. These locations include the main left bundle branch or in each of its two major fascicles; the distal conduction system of the left ventricle; the fibers of the bundle of His, which develop into the main left bundle branch; or the ventricular myocardium. Aim Serum levels of malondialdehyde (MDA) and ceruloplasmin (Cp) will be evaluated to understand more about the process of oxidative stress and its relationship to LBBB