Dexmedetomidine After Cardiac Surgery for Prevention of Delirium

Intravenous infusion with electric syringe of Dexmedetomidine 0,4ug/ml. Rate 0,1ug/kg/h to 1,4ug/kg/h. Nightly infusion from 20:00 to 08:00. The drug is titrated to achieve RASS between -1 and 1. Modification of infusion rate by 0,1ug/kg/h is recommended with stabilization phase of 1 hour before another rate adjustment.

Intravenous infusion with electric syringe of normal saline. Rate modifications follow the same rules as in experimental group.