Abnormality of cardiovascular system electrophysiology Cardiac conduction abnormality 2017-09-24T22:36:44Z The conduction system of the heart initiates and coordinates the electric signal that causes the rhythmic and synchronized contractions of the atria and ventricles. In higher vertebrates, this system comprises the sinuatrial (SAN) and atrioventricular nodes (AVN) and the wiring of the ventricles. The latter comprises the atrioventricular bundle (AVB), the left and right bundle branches (BBs), and the peripheral ventricular conduction system (PVCS). Abnormality of cardiac conduction system Cardiac conduction abnormalities Any anomaly of the progression of electrical impulses through the heart. Heart conduction disorder Cardiac conduction defects Abnormality of cardiac conduction