BCHE and atrioventricular block: Although resolution of AV block has been reported in 41% when rate-limiting drugs are discontinued, over half have recurrence of AV block in the absence of therapy.67 Patients receiving cholinesterase inhibitors for dementia are more likely to be hospitalized for syncope (HR 1.76) or symptomatic bradycardia (HR 1.69) and to undergo pacemaker implantation (HR 1.49).68