MPO and atrial fibrillation: For cell culture experiments and measurements of circulating ICAM1, VCAM1, SELE, SELP and MPO protein a subgroup of 25 AF patients before catheter ablation (median age 62 years, 44% women), 13 non-AF patients (median age 62 years, 54% women) and 14 non-matched AF patients after catheter ablation during FU was analysed whereas sufficient sample accessibility for HDL-isolation was a selection criterion.