Long-Term Efficacy of Upstream Therapy Using Angiotensin-Converting Enzyme Inhibitors and Statins in Combination With Antiarrhythmic Agents for the Treatment of Paroxysmal Atrial Fibrillation

Abstract

The long-term efficacy of upstream therapy to prevent occurrence of paroxysmal atrial fibrillation (AF) in Japanese patients remains unclear. We retrospectively assessed the long-term efficacy of combination therapy with pravastatin (10 mg/day) and enalapril (5 mg/day) in addition to antiarrhythmic drugs (AAD) for maintaining sinus rhythm in patients with AF. This study included 319 patients (221 men, 98 women, mean age, 68 ± 10 years, mean follow-up period, 50 ± 34 months) who were divided into 4 groups: group I (n = 191) without combination therapy - namely pravastatin(-) and enalapril(-); group II (n = 81) with combination therapy - pravastatin (-) and enalapril (+) (n = 81); group III (n = 29) with combination therapy - pravastatin (+) and enalapril (-); and group IV (n = 18) with combination therapy - pravastatin (+) and enalapril (+). The percentages of patients free from conversion to permanent AF at 12, 36, 60, 90, and 120 months were as follows: group I 88, 83, 78, 75, and 73%, respectively; group II 96, 88, 79, 77, and 75%, respectively; group III 100, 97, 91, 91, and 86%, respectively; group IV 100, 100, 100, 94, and 94%, respectively. The actuarial rate free from conversion to permanent AF at 120 months was significantly higher in group IV than in group I (P < 0.05). The results suggest that in patients with paroxysmal AF, the addition of both pravastatin and enalapril to AAD was more effective for maintaining sinus rhythm in terms of an upstream therapy.