Adherence to the Atrial Fibrillation Better Care (ABC) pathway and outcomes in patients with chronic kidney disease: A report from the APHRS-AF registry

Abstract Background The Atrial Fibrillation Better Care (ABC) pathway is based on three pillars: "A" avoid stroke with oral anticoagulation, "B" better symptoms control, and "C" optimization of cardiovascular risk factors and lifestyles. This integrated approach has been associated with improved outcomes in atrial fibrillation (AF) patients, but few data are available in patients with chronic kidney disease (CKD). Purpose To investigate the correlation between chronic kidney disease, adherence to the ABC pathway, and the occurrence of adverse events in patients with AF enrolled in the Asian-Pacific Heart Rhythm Society-AF Registry. Methods Logistic regression was used to investigate factors associated with CKD, warfarin use and rhythm control strategies. Cox regression analysis adjusted for age≥75 years, paroxysmal AF, CHA2DS2VASc≥2, chronic obstructive pulmonary disease, cancer, and ABC adherence was used to calculate Hazard Ratios (HRs) and 95% Confidence Interval (CI) for the risk of primary outcomes in patients with CKD (eGFR <60 ml/min/1.73m2). Sensitivity analyses were performed in moderate (eGFR 59-30) and severe CKD (eGFR<30). Interaction analysis investigated the effect of ABC pathway based on presence or absence of CKD. Primary outcomes were the risks of all-cause death, major cardiovascular events (MACE: Cardiovascular death, acute coronary syndromes, thromboembolic events, and acute heart failure) and major bleeding. Results We included 2 578 AF patients without CKD (age 66.5±11.3 years, 32.5% females) and 1 047 AF patients with CKD (75.3±10.3 years, 40.8% females). Lower ABC pathway full adherence was observed in CKD patients (42.1% vs 29.5%, p<0.001), primarily due to low adherence to "A" and "C" criteria. Logistic regressions confirmed the lower likelihood of anticoagulation (Odds Ratio (OR) 0.61, 95%CI 0.44-0.83), a higher use of warfarin (OR 1.50, 95%CI 1.23-1.83) and lower use of rhythm control strategies (OR 0.79, 95%CI 0.66-0.94) in CKD patients. After one-year follow up, patients with CKD had a higher incidence of all-cause death (1.6% vs 7.2%, p<0.001) and MACE (3.4% vs 8.1%, p,0.001) compared to those without CKD. On Cox multivariable analysis (Figure 1, Panel A-D), CKD and ABC adherence were independently associated with the risk of all-cause death (HR 2.54, 95%CI 1.69-3.80 and HR 0.57, 95%CI 0.35-0.93, respectively) and MACE (HR 1.58, 95%CI 1.14-2.20 and HR 0.66, 95%CI 0.46-0.95, respectively). The risk of primary outcomes was the highest in those with severe CKD. No association was found with the risk of major bleeding. The interaction analysis confirmed that the beneficial effect of ABC pathway adherence on death (p int= 658) and MACE (p int= 0.568) was irrespective of CKD. Conclusion AF patients with CKD have low ABC pathway adherence and high risk of all-cause death and MACE. Efforts to improve the ABC pathway adherence in AF patients with CKD are needed to improve their long-term clinical outcomes.Figure 1.Cox regression analyses