Cases (i.e. those undergoing pacemaker insertion) were notably less likely to be coded with dementia (10.9% vs. 22.8%; unadjusted odds ratio (OR) 0.42 [95%CI 0.41-0.42]) or exposed to cholinesterase inhibitors (1.6% vs. 4.0%; unadjusted OR 0.39 [95%CI 0.37-0.41]) (Table 5). Here, BCHE is linked to dementia.