Electroencephalographic Biomarker to Predict Postoperative Delirium

Study Overview
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Brief Summary
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Acute post-operatory cognitive dysfunction states are one of the most important complications in older patients that underwent surgery. Among them postoperative delirium (POD) is the the most studied. Patients who develop delirium have poorer long-term outcomes, such as longer length of hospital stay, institutionalization at discharge, and even higher mortality, and consequently, the human and economic costs significantly increase for the health system. Here the research team will use an observational cohort, investigator blinded in five-center with a primary endpoint to validate intraoperative EEG analysis as a reliable biomarker of postoperative delirium.

Detailed Description
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Acute post-operatory cognitive dysfunction states are one of the most frequent complications in older patients after surgery, being POD the most important. Previous studies have shown than the incidence of POD in older patients range between 10-50%. Patients who develop POD have poorer long-term outcomes, such as longer length of hospital stay, institutionalization at discharge, and even higher mortality. Consequently, the human and economic costs associated to POD represents an important issue for health systems worldwide. A key element to diminish POD and its burden on healthcare is early diagnostic. Current risk assessment tools are centered on clinical approaches based on cognitive tests (i.e., MoCA) and/or prediction models that uses patients' clinical variables (i.e., DELPHI score). We have developed a strategy that uses intraoperative EEG features as building blocks for a new POD risk assessment predictive model. This system, called PEUMA, uses data obtained from 95 patients from a previous study (NCT04214496). This will be a multicenter (five-centers), observational study and its primary outcome will be PEUMA's ability to predict POD. To calculate the sample size, the methodology described by Riley et al was used. This method is specially designed for clinical prediction models. Such a tool is available online (https://mvansmeden.shinyapps.io/BeyondEPV/). The parameters used were the following: Number of predictor candidates: 4 Fraction of events: 0.22. 22% was used because it is the incidence of POD in the analysis of the preliminary data of the first stage and these are in the reporting range common worldwide. Estimation error of the classifier: 0.06. The authors suggest prediction errors small when evaluating binary outcomes (Yes POD/No POD) The calculation indicates a sample size of 240 patients. Considering a loss of 10% (in the preliminary results of the first stage the loss was 8%), the sample size is 264 patients.

Official Title
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Electroencephalographic Biomarker to Predict the Development of Postoperative Delirium: a Protocol of an Observational Study in a Cohort of Patients From Five Centers

Conditions
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Postoperative Delirium

Intervention / Treatment
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* Diagnostic Test: POD risk estimation using PEUMA


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age ≥ 60 years old Scheduled for high-risk elective surgery Need for at least 3 days of hospital stay after surgery Surgery performed under general anesthesia Written informed consent for participation in the trial Exclusion Criteria: Patients with preoperative delirium or dementia Patients using neuroleptics drug during the past 6 months Patients with a history of encephalopathy, psychosis, stroke or brain trauma with neurologic sequels The use of ketamine or dexmedetomidine during surgery Emergency surgery Mechanical ventilation during the 72 after surgery Analphabetism Patients who do not talk Spanish Patients included in another clinical trial

Ages Eligible for Study
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Minimum Age: 60 Years
Maximum Age: 100 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Patients at risk of developing POD<br>Patients older than 60 years Scheduled for elective surgery of moderate or high risk (defined as that which requires a subsequent hospitalization of at least 3 days) under general anesthesia. Signed informed consent. | Diagnostic Test: POD risk estimation using PEUMA<br>* A software will analyze intraoperative EEG recording for the estimation of a POD Risk Index<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Postoperative Delirium | Incidence of POD in the cohort diagnosed using the Confusion Assessment Method (CAM) twice/day | First 3 days after surgery | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Death | Number of deceased patients | 30 days after surgery | 
| Delirium Severity | Delirium severity assessed by Cognitive Assessment Method - Severity (CAM-S) | First 3 days after surgery | 
| Delirium Duration | Duration of delirium during the postoperative period | First 3 days after surgery | 
| Need for Mechanical Ventilation | Number of patients that needed mechanical ventilation | First 3 days after surgery | 
| Reintervention | Number of patients who required other unanticipated surgery after the primary intervention | First 3 days after surgery | 
| Unanticipated ICU hospitalization | Number of patients that needed unanticipated intensive care unit (ICU) care | First 3 days after surgery | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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EEG, Postoperative Delirium, Risk Assessment, Anesthesia