PPBP and atrial fibrillation: We investigated associations between NAP-2 levels, neutrophil extracellular traps (NETs) formation, and fibrin clot properties in atrial fibrillation (AF). We recruited 237 consecutive patients with AF (mean age, 68 ± 11 years; median CHA2DS2VASc score of 3 [2–4]) and 30 apparently healthy controls.