Medium-term and long-term renal function changes with direct oral anticoagulants in elderly patients with atrial fibrillation

Objective: Atrial Fibrillation (AF) and chronic kidney disease frequently coexist in the elderly. Warfarin-like drugs (WLDs) may be associated with a relatively greater decrease of estimated glomerular filtration rate (eGFR) as compared to direct oral anticoagulants (DOACs), but there is no evidence on the medium- and long-term changes. To further elucidate this issue in elderly patients with AF, we investigated the renal function deterioration in the two groups of the study (DOACs or WLDs).Patients and Methods: A total of 420 AF patients were enrolled (mean age: 77.0 +/- 6.0 years; 136 on WLDs and 284 on DOACs). These patients underwent three eGFR measurements during the follow-up period. The between-arms difference of eGFR decline over time was investigated by Linear Mixed Models and group-based trajectory model analyses.Results: In thewhole study cohort, after amedian follow-up of 4.9 years (interquartile range: 2.7-7.0 years), eGFR decreased from 67.4 +/- 18.2 to 47.1 +/- 14.3mL/min/1.73m(2) (p < 0.001). Remarkably, patients on DOACs experienced a significantly smaller eGFR decline thanWLDs patients (-21.3% vs. -45.1%, p < 0.001) and thiswas true both in the medium-term (-6.6 vs. -19.9 mL/min/1.73m(2)) and in the long-term (-13.5 versus -34.2 mL/min/1.73m(2)) period. After stratification into five subgroups according to trajectories of renal function decline over time, logistic regression showed that DOACs patients had from 3.03 to 4.24-fold greater likelihood to belong to the trajectory with less marked eGFR decline over time than WLDs patients.Conclusion: Elderly patients with AF on treatment with DOACs had a relatively smaller decline of eGFR over time compared to those on treatment with WLDs. This is consistent with what was partly reported in the literature.