DPP4 and atrial fibrillation: This study showed that serum DPP-4 levels did not correlate with DPP-4 levels in SAT or EAT; the DPP-4 levels in the SAT correlated with the DPP-4 levels in the EAT, atherosclerosis, and FBG, and the DPP-4 levels in the EAT correlated with AF and eGFR.