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Brain regions and functional neuronal network characteristics of dexmedetomidine analgesia under intraoperative fMRI

NCT ID NCT05500703

NEW Sponsor: China International Neuroscience Institution 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
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
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Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
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 Results may not be published yet.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

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The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Sep 10, 2026 · Last updated Sep 10, 2026

Summary

Background: Dexmedetomidine (Dex) is a highly selective 2-adrenergic receptor agonist with significant analgesia affection. This study is planned to explore the brain regions and functional neuronal network involved in promoting analgesia of Dexmedetomidine. Methods: Select 28 patients with the proposed intraoperative MR-guided radiofrequency ablation of epilepsy. The subjects were randomized into the Dexmedetomidine group (Dex group) (n=14) and the Placebo group (PO group) (n=14). DEX group: continuous intravenously administered 1.5 µg kg-1 h-1 dexmedetomidine 15min before anesthesia induction, continuous infusion for 15min after anesthesia induction, and then Intraoperative functional magnetic resonance imaging scanning was started. PO group: the equivalent administered speed 0.9% sodium chloride was continuously pumped for 15min before anesthesia induction, then induce and intraoperative fMRI scanning started after continuous 30min infusion. The intraoperative fMIR scan results were compared and analyzed to find the unique analgesic brain regions of DEX, and the differences of the functional neuronal network of analgesia effect between the two groups.On January 8, 2024, the protocol was amended and approved by the Institutional Review Board (IRB) of China International Neuroscience Institution (Approval No. CINI-AD-20220706). In this approved amendment, to ensure a direct assessment of the most clinically meaningful patient-centered benefit, the primary outcome was redefined as postoperative pain measured by the Numerical Rating Scale (NRS) at 4, 24, and 48 hours. The pre-specified imaging measures BOLD were re-designated as secondary outcomes to explore the neural correlates of the analgesic effect. This protocol amendment was finalized prior to the enrollment of the first participant on January 15, 2024.

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Study facts

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

Phase

Phase 4

Runs after approval, following long-term safety and how well the treatment works in everyday use.

Participants

28 people

The number who actually took part.

Started

Jan 2024

Finished

Dec 2024

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

20 to 50 years

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: 1. Clinical diagnosis of epilepsy and eligible for radiofrequency ablation 2. 20-50 years old; 3. American Society of Anesthesiologists rated (ASA) I-II 4. body mass index (BMI)18.5\~27.9 kg·m2. Exclusion Criteria: 1. pre-existing neuropsychiatric disorders; 2. emergency surgery; 3. coma; 4. depression; 5. cognitive impairment; 6. implanted with metal devices.

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Conditions

The condition(s) this trial relates to.

epilepsy

As listed by the trial registrant

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

Epilepsy Intracranial surgery Radiofrequency ablation

Contacts and locations

Locations

  • Xuanwu hospital

    Beijing, Beijing Municipality, 100053, China

More trials for these conditions

Other studies related to the condition(s) this trial covers.