Background
Recently, inflammation plays an essential role in the prognosis of
atrial fibrillation (AF) patients. Systemic immune-inflammation index
(SII), reflecting the inflammation status, which is measured by the
formula: neutrophil count × platelet count/lymphocyte count, is a
powerful prognostic marker in several types of cancer and cardiovascular
disease. However, no information regarding the prognostic value of SII
in patients with AF is available.