[Clinical-epidemiological characteristics of the atrial fibrillation in patients 65 years of age or older diagnosed in primary care.]

Background: The identification of atrial fibrillation in older patients who come to Primary Care consultations is a topic of interest that has been scarcely studied. The objective of this work was to estimate the frequency of new cases of atrial fibrillation and to analyze the clinical-epidemiological characteristics of patients 65 years of age or older, detected in Primary Care in Spain. Methods: An observational. descriptive, national, multicenter study was carried out in 48 health centers, in which 218 doctors and 101 Primary Care nurses recruited 7,068 patients, who underwent an arterial pulse and an electrocardiogram. in case of being abnormal or doubtful. determining the presence of atrial fibrillation and other rhythm disorders. symptoms and signs compatible with atrial fibrillation and comorbidity and cardiovascular risk factors. A univariate, bivariate and multivariate analysis (multiple logistic regression) was performed. Results: The patients had a mean age of 74.41 +/- 6.78 (DT) years. 2.3% presented atrial fibrilation (95% CI: 2.0-2.7), being its frequency higher in men (2.9%; p<0.001), and as age increased (p 0.001). The most frequent symptoms present among patients with atrial fibrillation were palpitations (Odds Ratio -OR-=3.50; 95% CI: 2.28-5.37), dyspnea (OR=2.71; 95% CI: 1.87-3.90), general discomfort (OR=2.32, 95% CI: 1.15-4.63), and dizziness (OR=1.80, 95% CI: 1.20-3.51). The 21.8% were asymptomatic. Conclusions: The frequency of new cases of atrial fibrillation in the Spanish population of 65 years or older is high. being higher in men and increasing with age. Two out of ten patients are asymptomatic. Palpitations and dyspnea are the predominant symptoms in patients with atrial fibrillation.