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Eye Movements to Predict Post-Operative Delirium (EYE-POD)

1 september 2026 uppdaterad av: Iván Plaza-Rosales, University of Chile

Predicting Post-operative Delirium Using Eye Movements: a Pilot Study

Postoperative delirium (POD) is a common complication in older adults undergoing surgery, lacking objective and noninvasive diagnostic methods. This trial aims to evaluate the feasibility and prognostic performance of Eye movements (EM) as a risk biomarker for the development of POD in older patients undergoing moderate- to high-risk surgery. The investigators hypothesize that EM tracking will accurately predict POD, potentially optimizing early intervention and patient outcomes.

Studieöversikt

Status

Anmälan via inbjudan

Betingelser

Detaljerad beskrivning

This prospective trial evaluates the integration of automated eye movement assessments as a novel, noninvasive risk biomarker for postoperative delirium (POD) in older adults. Upon enrollment, trained clinical staff will collect baseline demographic data and clinical characteristics. Chronic medical burden will be quantified using the Charlson Comorbidity Index (CCI). To establish baseline cognitive function and control for preexisting cognitive impairment, all participants will undergo the Montreal Cognitive Assessment (MoCA).

Technical Protocol for Eye Movement Recording

Preoperatively, participants will complete an automated eye movement tracking protocol consisting of two distinct paradigms:

Prosaccadic Task: Utilized to measure specific ocular motor parameters, including saccadic latency, velocity, and accuracy.

Free Visual Exploration Task: Utilized to capture free-gaze metrics and spatial distribution patterns.

All eye-tracking data will be recorded using automated software to ensure objectivity and reproducibility.

Postoperative Monitoring Following the surgical procedure, patients will be systematically monitored for the development of POD. The Confusion Assessment Method (CAM) will be administered by trained examiners twice daily (morning and evening) for the first three postoperative days (72 hours) to detect and document the incidence and severity of delirium.

Statistical and Predictive Objectives

The collected data will be analyzed to fulfill three primary scientific objectives:

  1. Parameter Association: To identify which specific preoperative eye-tracking metrics (latency, velocity, accuracy, or free-gaze variables) demonstrate a statistically significant association with the incidence of POD.
  2. Diagnostic Performance: To calculate the sensitivity and specificity of these distinct preoperative eye movement parameters for predicting POD development.
  3. Incremental Predictive Value: To evaluate whether adding preoperative eye-tracking measurements to a standard clinical prediction model (comprising age, sex, CCI, and MoCA scores) significantly improves the model's overall predictive performance and risk stratification capabilities.

Studietyp

Observationell

Inskrivning (Beräknad)

40

Kontakter och platser

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Studieorter

  • Chile
    • Santiago Metropolitan
      • Santiago, Santiago Metropolitan, Chile, 8320000
        • Hospital Clínico de la Universidad de Chile

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

  • Äldre vuxen

Tar emot friska volontärer

Ja

Testmetod

Icke-sannolikhetsprov

Studera befolkning

Older adult patients scheduled for moderate- to high-risk surgeries at the Hospital Clínico de la Universidad de Chile. The cohort is drawn from the elective surgical scheduling pool of the institution, aiming for a balanced distribution across biological sex and age ranges within the target demographic.

Beskrivning

Inclusion Criteria:

  • Patients aged 70 years or older.
  • Scheduled for moderate- to high-risk elective surgery, defined as a procedure requiring a postoperative hospital stay of at least 3 days.
  • Able to provide signed, written informed consent.

Exclusion Criteria:

  • Presence of delirium at baseline admission, evaluated via the Confusion Assessment Method (CAM).
  • Use of neuroleptic/antipsychotic medications within the past 6 months.
  • Prior history of dementia (including Alzheimer's disease, vascular dementia, or mild cognitive impairment).
  • History of encephalopathy.
  • Psychiatric disorders presenting with psychosis.
  • Brain injury with neurological sequelae (e.g., prior stroke, traumatic brain injury).
  • Visual acuity is insufficient to complete the automated eye-tracking tasks.
  • Illiteracy.
  • Non-Spanish speakers.
  • Concurrent participation in any other clinical trial.

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

Kohorter och interventioner

Grupp / Kohort
No Intervention: Control (Usual care) + Eye movement recording

This is a prospective, observational cohort study designed to evaluate the prognostic accuracy of a preoperative eye-tracking biomarker protocol for predicting postoperative delirium (POD). All eligible participants are recruited from a cohort of patients already scheduled for moderate- to high-risk elective surgery at the University of Chile Clinical Hospital.

The study procedures (baseline clinical data collection, Charlson Comorbidity Index, MoCA, and automated eye-tracking tasks) are strictly observational and diagnostic. The eye-tracking results are recorded for research purposes only and do not alter standard perioperative care, surgical management, or anesthetic techniques. Patients are subsequently followed into the postoperative period to monitor the incidence of POD via twice-daily Confusion Assessment Method (CAM) evaluations during the first three postoperative days.

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Incidence of postoperative delirium (POD).
Tidsram: From the day of surgery up to postoperative day 3, patients were assessed twice daily.
The presence or absence of postoperative delirium will be assessed using the Confusion Assessment Method (CAM). Patients will be classified as "POD" or "No POD" based on the CAM diagnostic algorithm.
From the day of surgery up to postoperative day 3, patients were assessed twice daily.

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Preoperative Baseline Cognitive Status
Tidsram: At preoperative baseline (day of surgery or day before).
Total score on the Montreal Cognitive Assessment (MoCA) to determine baseline global cognitive function. The score ranges from 0 to 30, with lower scores indicating greater cognitive impairment.
At preoperative baseline (day of surgery or day before).
Preoperative Comorbidity Burden
Tidsram: At preoperative baseline (day of surgery or day before)
Score on the Charlson Comorbidity Index (CCI) to quantify the participant's baseline medical comorbidity burden and pre-existing health conditions.
At preoperative baseline (day of surgery or day before)
Preoperative Saccadic Latency
Tidsram: At preoperative baseline (day of surgery or day before)
The time taken from the appearance of a visual target to the initiation of the participant's saccadic eye movement during the prosaccadic task (milliseconds).
At preoperative baseline (day of surgery or day before)
Preoperative Saccadic Velocity
Tidsram: At preoperative baseline (day of surgery or day before).
The peak speed of the participant's eye movement when moving towards the visual target during the prosaccadic task (degrees per second).
At preoperative baseline (day of surgery or day before).
Preoperative Free Viewing Number of Fixations
Tidsram: At preoperative baseline (day of surgery or day before).
The absolute count of discrete gaze fixations made by the participant during the free visual exploration task (number of fixations)
At preoperative baseline (day of surgery or day before).
Preoperative Free Viewing Saccade Length
Tidsram: At preoperative baseline (day of surgery or day before).
The average spatial distance between fixations in the participant's eye movements during the free visual exploration task (degrees of visual angle).
At preoperative baseline (day of surgery or day before).
Hospital Length of Stay
Tidsram: Up to 30 days post-surgery.
Total hospital stay from the day of surgery until official hospital discharge.
Up to 30 days post-surgery.
All-Cause Mortality
Tidsram: At 30 days post-surgery.
Total number of participant deaths from any cause, verified via hospital electronic medical records or direct follow-up contact.
At 30 days post-surgery.

Samarbetspartners och utredare

Det är här du hittar personer och organisationer som är involverade i denna studie.

Sponsor

University of Chile

Utredare

  • Huvudutredare: Ivan Plaza-Rosales, PhD, University of Chile

Publikationer och användbara länkar

Den som ansvarar för att lägga in information om studien tillhandahåller frivilligt dessa publikationer. Dessa kan handla om allt som har med studien att göra.

Allmänna publikationer

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Faktisk)

6 augusti 2026

Primärt slutförande (Beräknad)

1 december 2026

Avslutad studie (Beräknad)

1 mars 2027

Studieregistreringsdatum

Först inskickad

3 augusti 2026

Först inskickad som uppfyllde QC-kriterierna

1 september 2026

Första postat (Faktisk)

8 september 2026

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

8 september 2026

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

1 september 2026

Senast verifierad

1 juli 2026

Mer information

Termer relaterade till denna studie

Nyckelord

Ytterligare relevanta MeSH-villkor

Andra studie-ID-nummer

  • 159526

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