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Aim. We aimed to assess autoantibodies to M2-cholinoceptors (M2-CR) in patients with paroxysmal lone atrial fibrillation (AF) and in patients with AF and arterial hypertension (AH). Materials and methods. 100 patients with lone AF and 84 patients with AF and AH were included. Patients underwent clinical blood and urinalysis, assessment of biochemistry blood panel, 12-lead ECG, 24-hour Holter monitoring, echocardiography and stress - testing (treadmill or stress - echocardiography). Assessment of IgM and IgG autoantibodies to M2-CR was performed by indirect immunoenzyme assay. The following peptide molecules were used as epitopes for detection of autoantibodies: M1 - amino acid sequence YTVIGYWPLGVVCDL (83-98) of the first extracellular loop of M2-CR; M2 - sequence VRTVEDGECYIQFFSNAAVTFGTAI (168-192) of the second extracellular loop of M2-CR; M3 - sequence NTFCAPCIPNTV (410-421) of the third extracellular loop of M2-CR; M4 - short sequence VEDGECYIQFFS (171-182) of the second extracellular loop of M2-CR; M1+M4 - chimeric molecule formed by sequences of the first and the second extracellular loops of M2-CR connected by disulfide bound YTVIGYWPLGVVCDL + VEDGECYIQFFS (83-98 + 171-182). Results. Autoantibodies to M2-CR were found in 45% patients with lone AF and in 35% patients with AF and AH. In patients with lone AF prevalence of increased IgG to M2-CR were greater than in patients with AF and AH (32% vs 20%; p

Autoantibodies to M2-cholinoreceptors as a potential development factor of arrhythmia in patients with paroxysmal atrial fibrillation