Hip Fracture Surgery in Elderly Patients

Inclusion Criteria: * Elderly patient (≥ 75 years) * Patient with planned hip fracture surgery within 48 hours after the hip fracture * Patient willing and able to complete the requirements of this study including the signature of the written informed consent Exclusion Criteria: * Patient suffering from multiple fractures, pelvic fractures proximal, pathological fractures, femur fractures (i.e., fractures of the middle or distal femur) * Disabling neuropsychiatric disorders (severe dementia, Alzheimer's disease, schizophrenia, depression) * Brain trauma within 12 months prior to selection, history of stroke with residuals * Patient suffering from delirium (CAM diagnosis) at selection * Patient who cannot complete the pre-operative mental tests (CAM and/or MMSE) of this clinical trial * Patient with Mini-Mental State Examination (MMSE) score \< 24 at selection * Patient known to susceptible to malignant hyperthermia * Patient with elevated intra-cranial pressure * Patient with a risk of high oxygen demand * Patient with recent or ongoing myocardial infarction / damage * Patient with severe cardiac failure, or patient with severe impaired left ventricular systolic function * Patient with known severe lung and/or airway disease, or severe chronic respiratory insufficiency, or a sustained homecare oxygen therapy * Contra-indication (serious illness or medical conditions) for general anaesthesia * Known allergy or hypersensitivity to any drugs administered during this clinical trial * Previous participation in this clinical trial * Participation in another clinical trial within 4 weeks prior to selection * History of alcohol or drug abuse or psychiatric disorders which would impair the understanding of the necessary information or render medically or legally unable to give written informed consent