Under normal circumstances, the SA node will generate the initial action potential which travels through the right and left atria, thereby depolarising the atria and allowing the contractile myocytes to contract.¹ The impulse is slowed when travelling through the atrioventricular (AV) node which allows the movement of blood from the atria to the ventricles.^1,3 The impulse then travels through the bundle of His and down the right and left bundle branches terminating in the Purkinje fibers, depolarising each respectively and...