Digitalized Clinical Decision Support for the Prevention of Postoperative Delirium (POD)

Study patients: Inclusion Criteria: * Age ≥ 70 years * Male and female patients * Patients who are insured through statutory health insurance * Patients capable of giving consent for inclusion: by the patient, preoperatively * Patients under guardianship for inclusion: written declaration of consent by guardian * Operation (elective) Exclusion Criteria: * Insufficient language skills * Moribund patients Study relatives Inclusion Criteria: * Age ≥ 18 years * Male and female relatives * Relatives capable of giving consent for inclusion Exclusion Criteria: * Insufficient language skills * No consent for data entry Substudy of the Charité - University Berlin: Inclusion criteria: \- All inpatients ≥ 18 years of age who have undergone delirium screening with a validated delirium screening instrument