In the first part, we described the pathophysiology of intracardiac conduction and supranodal blocks. In this second part, we will describe the atrioventricular, intranodal and infranodal blocks. The prognosis and short-term treatment of each are different. Intranodal blocks have good short-term prognosis, even if a pacemaker is occasionally required. The infranodal blocks have an adverse short-term prognosis (syncope or, in unusual cases, sudden death) and a pacemaker is usually required. A bundle-branch block is a partial intraventricular block and has good short-term prognosis, unless it is combined with other blocks (right bundlebranch block with left posterior fascicular block, or alternating bundle-branch block or seldom large left bundle-branch block with prolongation of the P-R interval). Diffuse intraventricular blocks are a sign of severe diffuse cardiac disease (e.g. myocarditis), or of systemic illness (hyperkalaemia, drug toxicity, hypothermia, etc.), while the focal intraventricular blocks are often associated with a structural cardiomyopathy (sequelae of necrosis, fibrosis, dysplasia, Brugada syndrome, etc.). Precise identification of intracardiac block is sometimes difficult, but it is essential to assess the short-term outcome and enhance treatment in emergency medicine.