Inclusion Criteria:  All patients admitted to the recovery room who have been diagnosed with delirium according to the treating physicians The patient is on a ward in the hospital Age ≥ 18 years Stay in the recovery room ≥ 1 day The patient is able to give consent  Exclusion Criteria:  Participation in a prospective intervention study (except adjuvant therapy study) Patients with underlying neurological diseases that make it difficult to differentiate from delirium Missing contact 3 months after stay in the recovery room.