Hydrochlorothiazide therapy: impact on early recurrence of atrial fibrillation after catheter ablation?

BACKGROUND Hypokalemia has been linked to electrocardiogram changes and afterdepolarization-mediated arrhythmias. However, the association betweeen hypokalemia and atrial fibrillation (AF) has not been well studied. Hydrochlorothiazide (HCT) diuretic therapy was shown to be associated with hypokalemia in multiple studies. We aimed to determine whether HCT therapy is associated with early recurrence of AF after radiofrequency (RF) catheter ablation during a 3 month follow-up. METHODS We performed a retrospective registry analysis of our internal AF ablation registry, containing 807 consecutive patients that underwent RF ablation for symptomatic AF. Propensity score matching was used to match 156 patients on HCT therapy with 156 controls. Furthermore, we performed propensity score matching between the first and the fourth quartile of baseline serum potassium (K) concentrations in the initial population (n=807). RESULTS We observed a small but statistically significant difference in baseline mean potassium levels between the HCT group and the control group (4.03 mmol/l vs. 4.19 mmol/l respectively, p= 0.001). There was no difference in short term recurrence of atrial fibrillation in the HCT group compared to the propensity score matched control group (41.0% (n=64) vs. 45.5% (n=71), p=0.424). In the comparison between the first and the fourth quartile of baseline serum potassium values, no difference in AF recurrence (38.2% (n=63) vs. 37.0% (n=61), p=0.820) during a 3 month follow up after ablation was observed between both groups. CONCLUSIONS Patients on HCT therapy showed no difference in short term recurrence of AF after ablation compared to propensity matched controls.