Jiang B, Gu JW, Song YY, et al. - The present study was performed to explore the therapeutic effects of a modified simultaneous unipolar saline-irrigated radiofrequency ablation by intracardiac operation under direct vision in patients with mitral valve diseases combined with atrial fibrillation (AF). Researchers recruited a total of 168 patients with mitral valve diseases combined with AF who had undergone unipolar saline-irrigated radiofrequency ablation modified maze procedures. Individuals were classified into the mitral stenosis (MS) group (n = 87) and the mitral insufficiency (MI) group (n = 81). During the mid-term post-operation, the cardioversion effects and the improvement in cardiac function were good in the radiofrequency ablation by intracardiac operation under direct vision in patients with different mitral valve diseases combined with AF. It was shown that cardioversion effects during the early postoperative period and the mid-term post-operation were better in patients with MI than in those with MS.