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Eye test may spot brain fog after heart surgery

NCT ID NCT07249047

Knowledge-focused Sponsor: London Health Sciences Centre Research Institute OR Lawson Research Institute of St. Joseph's Source: ClinicalTrials.gov ↗

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
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Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
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First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looks at whether measuring the optic nerve sheath (the covering of the nerve at the back of the eye) using ultrasound can help predict delirium—sudden confusion or agitation—after heart surgery. Researchers will monitor 300 adults before and after their operation. The goal is to see if a simple, non-invasive eye scan can catch early signs of this common complication.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 300 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Feb 2026

An estimate. Start dates often move.

Expected to finish

Dec 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * A d u l t s ≥ 1 8 y e a r s . * Scheduled for cardiac surgery requiring cardiopulmonary bypass (CPB) (e.g., Coronary artery bypass graft (CABG), valve, combined procedures, aortic surgery). * Anticipated postoperative admission to the Cardiac ICU with expected stay \>48 hours. * Preoperative ability to undergo ocular ultrasound examination (closed-eyelid scanning). * Provided informed consent to participate in this study. Exclusion Criteria: * Known or suspected open-globe injury, penetrating ocular trauma, or intraocular foreign body. * Recent ocular surgery or intravitreal intervention within the past 6 weeks (if surgeon advises against periocular pressure). * Ocular conditions that invalidate ONSD measurement (e.g., severe proptosis, advanced optic neuropathies, orbital tumors) or obstruct ultrasound window (extensive periocular dressings, severe periorbital edema). * Known intracranial pathology expected to significantly alter baseline ONSD (e.g., large mass lesion with midline shift, obstructive hydrocephalus) or presence of external ventricular drain at baseline. * Severe facial trauma or unstable cervical spine precluding safe positioning for ocular ultrasound. * P r e g n a n c y . * Inability to perform serial ONSD assessments at scheduled timepoints (e.g., continuous prone positioning) despite reasonable accommodations. * Enrollment in a conflicting interventional trial that mandates deviations from delirium assessment or ONSD protocol. * Inability to communicate in the English language.

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Conditions

The condition(s) this trial relates to.

Emergence Delirium

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Postoperative delirium

How to take part

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