ベンゾジアゼピン使用による認知症リスク

【文献名】 
文献タイトル:Benzodiazepine use and risk of dementia: prospective population based study. 
雑誌名・書籍名:BMJ 2012;345:27
発行年: September 2012

【要約】
Objective 
To evaluate the association between use of benzodiazepines and incident dementia.

Design 
Prospective, population based study.

Setting 
PAQUID study, France. Participants 1063 men and women (mean age 78.2 years) who were free of dementia and did not start taking benzodiazepines until at least the third year of follow-up.

Main outcome measures 
Incident dementia, confirmed by a neurologist.

Results 
During a 15 year follow-up, 253 incident cases of dementia were confirmed. 
New use of benzodiazepines was associated with an increased risk of dementia (multivariable adjusted hazard ratio 1.60, 95% confidence interval 1.08 to 2.38). Sensitivity analysis considering the existence of depressive symptoms showed a similar association (hazard ratio 1.62, 1.08 to 2.43). A secondary analysis pooled cohorts of participants who started benzodiazepines during follow-up and evaluated the association with incident dementia. The pooled hazard ratio across the five cohorts of new benzodiazepine users was 1.46 (1.10 to 1.94). Results of a complementary nested case-control study showed that ever use of benzodiazepines was associated with an approximately
50% increase in the risk of dementia (adjusted odds ratio 1.55, 1.24 to 1.95) compared with never users. The results were similar in past users (odds ratio 1.56, 1.23 to 1.98) and recent users (1.48, 0.83 to 2.63) but reached significance only for past users.

Conclusions 
In this prospective population based study, new use of benzodiazepines was associated with increased risk of dementia. The result was robust in pooled analyses across cohorts of new users of
benzodiazepines throughout the study and in a complementary case-control study. Considering the extent to which benzodiazepines are prescribed and the number of potential adverse effects of this drug class in the general population, indiscriminate widespread use should be cautioned against.

【開催日】
2012年10月24日












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