Heart failure hospitalizations and diuretic use before and after first-time pulmonary vein isolation ablation for atrial fibrillation among patients with heart failure. (3rd October 2022) - Westergaard, L
Abstract: Background: Small randomized clinical trials have found that patients with heart failure (HF) and atrial fibrillation (AF) randomized to an ablation strategy for AF experienced improved cardiovascular outcomes. We examined the relation in routine clinical practice. Purpose: We aimed to assess if first-time pulmonary vein isolation ablation (PVI) for AF among patients with HF was associated with decrease in HF hospital admissions rates and furosemide dosage in the year after PVI compared with the year before. Methods: We identified patients with HF and available left ventricular ejection fraction (LVEF) treated with a first-time PVI using the Danish Ablation Registry, and alive at 1-year follow-up. Patient comorbidities and concomitant pharmacotherapy (including furosemide dosage and HF hospital admissions) were identified utilizing Danish nationwide registries. For inclusion, patients were required to have been diagnosed with HF in an in- or outpatient setting <10 years of first-time PVI or have a LVEF at the time of PVI ≤45%. Patients were grouped according to LVEF at time of PVI: ≤35%, 36–45%, and >45%. For comparison of HF hospital admission and furosemide usage before and after PVI, McNemars test were used. Wilcox signed-rank test were used to test difference in furosemide dosage before and after PVI. Results: We identified 668/3450 patients with HF treated with first-time PVI for AF between 2010–2017 (median age 62 years [Q1, Q3=56, 69 years], 81% male, and median LVEF 45% [Q1, Q3=40, 60%]). Of these, 13 patients (2%) died during one-year follow-up. Overall, 36% of patients with HF had one or more HF hospital admissions the year before PVI compared with 7% in the year after PVI (p<0.0001) (Figure 1). Patients with LVEF ≤35% had the highest proportion of HF hospital admissions the year before PVI (53%) and was reduced more than 4-fold (13%) in the year after first-time PVI, with consistent findings in all LVEF groups (Figure 1). At the time of PVI, 36% of patients with HF were treated with furosemide compared with 30% in the year after PVI (p<0.0001) (Figure 2). Moreover, we identified significant reductions in furosemide dose in the year after PVI compared with the year before (median dose 60 mg [Q1, Q3=30, 80 mg] and 20 mg [Q1, Q3=0, 60 mg], respectively, p=0.001). Here, reductions in furosemide requirements were consistent across LVEF subgroups. Conclusion: Patients with HF treated with a first-time PVI strategy for AF had a 5-fold decrease in HF hospital admissions in the following year compared with the year before PVI. Among patients treated with furosemide at time of PVI, significant reductions in dose one year after PVI was identified but also significant reductions in proportion of patients requiring any furosemide at all. Funding Acknowledgement: Type of funding sources: None.