Objective All patients were divided into nonvalvular atrial fibrillation (AF) and contrlo group according to the clinical examinations. According to the clinical characteristic presentation of the nonvalvular AF,we distinguished two clinical subsets of nonvalvular atrial fibrillation:paroxysmal AF and persistent AF.1. To investigate the change of atherogenic index of plasma level in nonvalvular AF patients, and assess a possible relationship between AIP and the nonvalvular AF.2. To estimate the clinical fac...