Bonjour
Cela reste d’actualité. Dans la nouvelle publication citée partout, les auteurs précisent que leur observation ne permet aucun lien de cause à effet. Les journalistes ont juste recopié la dépêche d’agence.
http://www.bmj.com/content/345/bmj.e6231
"Benzodiazepines could also be seen as an early risk marker for dementia that might highlight a particular at risk background in patients, but without playing any causal role in the occurrence of the disease. For example, persistent anxiety in middle age has been shown to be associated with a greater risk of dementia in elderly people.43 Hence, benzodiazepine use may be a marker of this scenario and might help to identify people at increased risk of, and not already on the causal pathway leading to, dementia. However, in our study, two observations argue against this hypothesis : the strength of association did not increase across the five cohorts of new users (which would be expected in the event of reverse causation, as the time from benzodiazepine use to development of dementia is shorter), and the association between new use of benzodiazepines and dementia increased after about seven years of follow-up (fig 3⇑). However, reverse causation cannot be entirely ruled out as an alternative explanation of our findings."