ACEI and ARB did not Reduce the Incidence of Dementia in Patients with Atrial Fibrillation: A Nationwide Cohort Study.
OBJECTIVE
Atrial fibrillation (AF) is associated with increased risk of thromboembolism, and is also a predisposing factor to dementia. Our investigation was a retrospective observational study to evaluate whether the usage of angiotensin-converting-enzyme inhibitor (ACEI) or angiotensin II receptor blocker (ARB) could reduce the incidence of dementia in patients with AF.


METHODS
A total of 5221 patients over 20 years of age who had a history of AF as noted in ambulatory and inpatient claims data were enrolled from the National Health Insurance Research Database of Taiwan in 1997 and 1998. Patients with ACEI or ARB were designated as group 1 (4343 patients), and patients without ACEI or ARB were designated as group 2 (878 patients).


RESULTS
During a follow-up of 5.90 ± 3.39 years, 135 patients of group 1 (3.1%) and 25 of group 2 (2.8%) developed new-onset dementia. Group 1 and group 2 had similar proportions of new-onset dementia (p = 0.75). The Kaplan-Meier curve demonstrated that patients with ACEI or ARB were not associated with a lower incidence of dementia during the follow-up period (log rank p = 0.91). Cox-regression analysis also showed that usage of ACEI or ARB was not associated with a lower risk of new-onset dementia after adjustment for gender and comorbidities. (Hazard ratio = 0.942, 95% confidence interval 0.589~1.506, and p = 0.80).


CONCLUSIONS
ACEI or ARB may be ineffective in reducing the incidence of dementia in patients with AF.


BACKGROUND
Angiotensin-converting-enzyme inhibitor; Angiotensin II receptor blocker; Atrial fibrillation; Dementia.
Division of Cardiology, Department of Internal Medicine, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu, Taiwan;
Min-Tsun
MT
Liao
Division of Cardiology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan;
Lian-Yu
LY
Lin
Department for Traditional Chinese Medicine, Chang Gung Memorial Hospital Chia-Yi, Taiwan; ; Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University College of Public Health, Taipei, Taiwan.
Yao-Hsu
YH
Yang
Division of Cardiology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan;
Tin-Tse
TT
Lin
Division of Cardiology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan;
Jiunn-Lee
JL
Lin
Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University College of Public Health, Taipei, Taiwan.
Pau-Chung
PC
Chen
Division of Cardiology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan;
Chia-Ti
CT
Tsai