Pre-operative Neurocognitive Disorder and Low Near-infrared Spectrometry is Associated With Postoperative Delirium in Neurosurgical Patients

Postoperative delirium (POD) is a common problem among elders who undergo surgery and anesthesia, with major health consequences. This investigation is expected to clarify and understand the role of neurocognitive reserve in the occurrence of POD, provide grounds to preoperative cognitive risk stratification and early preventive interventions to improve patients' outcomes. The surgical procedure and anesthesia are stressor events that interact with underlying risk factors and play an important role in the development of POD. Evidence is lacking to make recommendations on anesthesia related perioperative interventions. This investigation will contribute to better understand the association between types of anesthesia, medications, monitoring and other anesthesia related factors that can be a target for preventive interventions. This research will add knowledge and clarify the role of predictors and precipitant factors that might enlighten future research on risk stratification models and interventions, prognostic significance, and treatment implications for POD.

All patients scheduled for Neurosurgery will be approached the day before surgery to assess if inclusion criteria are met and obtain informed consent. If so, preoperative evaluation will be performed by two nurse investigators responsible for admission of patients in the Neurosurgical ward.

The Mini-Cog test and the will be administered before surgery to all participants as cognitive assessment tool. The social-economical status will be evaluated regarding the level of education in years, level of physical activity, occupation, income and number of languages spoken (all categorized with appropriate scales). Also, during the preoperative evaluation, demographic data, alcohol consumption, smoking, use of visual or hearing aids, comorbidities, usual medication and preoperative laboratory test results will be obtained and recorded in a form. On the day of the surgery, as the patient arrives at the Operating Room (OR), the anesthesiologist will check for informed consent and the patient will be monitored with the following with the standard ASA protocol.

The Near-infrared spectroscopy (NIRS) is a technology widely used in clinical investigation as an index of brain and tissue oxygenation. The INVOS© Cerebral/Somatic Oximetry is used in high-risk patients or surgeries to provide continuous, real-time, regional oxygen saturation (rSO2. The monitoring parameters, excluding the INVOS©, will be continuously recorded on the software program RugloopII© Waves (Demed, Genk, Belgium).

In the Post-Anesthesia Care Unit (PACU) the infrared pupillometer will be used to measure the patient pupillary reflexes 15 minutes after admission and before PACU discharge.