Rivastigmine in the Management of Delirium

One transdermal patch of Rivastigmine (equivalent to 4.6 mg/24h per os) per day from randomization to day 14 before day 14: end od treatment, if DRS R-98 severity \< 10 during 2 consecutive days At day 14, if DRS R-98 severity ≥ 10: one transdermal patch of Rivastigmine 9.5 mg/24h per day from day 14 to day 30 if DRS R-98 severity \< 10, the active treatment will be stopped

One transdermal patch of placebo per day from randomization to day 14 Before day 14: end of treatment if DRS R-98 severity \< 10 during 2 consecutive days, At day 14 if DRS R-98 severity ≥ 10: One transdermal patch of placebo per day from day 14 to day 30 if DRS R-98 severity \< 10, the placebo treatment will be stopped