Postresuscitation myocardial dysfunction is reversible heart failure and B-type natriuretic peptide (BNP) is a biochemical marker of ventricular disorders secreted from ventricle, which can be used to assess the status of left ventricular function.1-3This study investigated the effect of β-adrenergic blocker on concentration of BNP and cardiac function after cardiopulmonary resuscitation in rabbits.