BCHE and delirium: In one case report, the cholinesterase inhibitor rivastigmine was given preoperatively to prevent delirium postoperatively in a PD patient successfully treated with this drug in two previous delirious episodes.97 In another case report, prokinetics were administered in two patients to prevent paralytic ileus.92 Some authors suggest preventive antibiotics to prevent infections.44,45,59 As described before, the onset of the postoperative delirium is often delayed.