Aims. To evaluate the impact of body weight dynamics on the clinical course of atrial fibrillation in obese patients. Materials and methods . The study included 101 primary obese patients with paroxysmal or persistent atrial fibrillation. Study design: a retrospective, single-center, comparative study. Retrospectively аccording to the he body weight dynamics, patients were divided into 3 groups: those who increased their body weight by >3 % (Group 1, n=40), maintained their initial body weight by ±2.9 % (Group 2, n=29), and reduced their initial body weight by >3 % (Group 3, n=32). Follow-up examinations by a doctor were carried out at least once every 6 months for minimum 36 months. Change in AF type was determined by disease patterns and 7-day Holter monitoring results. The groups were comparable in gender (p=0,9267), age (p=0,3841), height (p=0,8900), and disease form (Paroxysmal atrial fibrillation /Persistent atrial fibrillation) (p=0,8826), the severity of symptoms on the European Heart Rhythm Association score of atrial fibrillations (p=0,8687) and systolic blood pressure at the beginning of the study (p=0,4500). Results . At the final control examination, the body weight of patients in Group 1 increased by an average of 11,4 [9,3; 13,1] kg (р <0,001*), while weight loss in Group 3 averaged -6,2 [-8,4; -5,3] kg (p <0,001*). The decrease in body weight of Group 2 patients was insignificant (p=0,5377) and amounted to -0,1 [-2,0; 1,3] kg. The progression of the disease from paroxysmal to persistent form was observed among 15 (37 %) patients in Group 1, 9 (31 %) patients — in Group 2, 2 (6 %) patients — in Group 3 (p=0,0079*). The regression of arrhythmia from persistent to paroxysmal form was not registered in group 1 (0 %), in group 2, the reverse development of the disease was noted in 1 patient (3 %) and in group 3 — in 6 patients (19 %) (p=0,0053*). There were no free from AF patients in Group 1 at the final follow-up, while 2 (7 %) patients were free from AF in Group 2 and 7 (22 %) — in Group 3 (р=0,0047*). In patients undergoing ablation, procedural success was determined after a 3-month blind period. The need for interventional procedures to restore the sinus rhythm and their multiplicity when comparing the groups did not differ significantly. However, in a pairwise comparison, the difference between groups 1 and 3 of participants was statistically significant (p=0,0079* and p=0,0374*, respectively). Conclusion . This study demonstrates the relationships between the dynamics of body weight and the clinical course of atrial fibrillation. The progression of obesity leads to the progression of the disease. Weight-loss management reverses the type and natural progression of AF, improves the prognosis and the course of disease, regardless of other significant risk factors, increases the anti-arrhythmic therapy effect and the effect of interventional treatment.
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