LAUSR

Objective: Atrial fibrillation (AF) is the most common cardiac arrhythmia. It is present in 1–2% of the population. To assess the need for anticoagulation is essential for its management. Our objective was to investigate whether the indication of anticoagulation was adequate in patients diagnosed with atrial fibrillation, given the CHA2-DS2-VASc scale, measuring the International Normalizad Ratio range (INR) in patients treated with anti-vitamin K drugs. Design and method: This is an observational and cross sectional study. 271 patients with atrial fibrillation were included. We analyzed demographic, the CHA2-DS2-VASc and HAS-BLED variables, the treatment and INR values for 6 consequentive months. The confrontation of variables was performed using chi-square and Mantel-Haenzel tests. Results: The prevalence of AF was 1,2%. The mean age was 74,9 ± 11,4. 90,4% had hypertension, 37,6% diabetes mellitus and 16,2% presented history of bleeding. The 89,3% had CHA2-DS2-VASc > 1. The 73,8% were taking anticoagulants, of which 61,3% were under antivitamin k. The 44,8% of patients taking antivitamin K, presented inadequate range of INR, although 93,3% of them followed up the monitoring properly. There was a greater prescription of anticoagulants in patients with persistent or permanent AF compared to the paroxysmal form. Conclusions: The level of anticoagulation with antivitamin K was inadequate in our sample, despite a proper follow up and adherence to treatment. Patients diagnosed with paroxysmal AF were less anticoagulated than those diagnosed with persistent or permanent AF.