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The Influence of Dexmedetomidine Hypnosis on Cerebrospinal Fluid (CSF) Volume, Brain Diffusion and 'Stiffness' Characteristics.

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT03757897
Recruitment Status : Not yet recruiting
First Posted : November 29, 2018
Last Update Posted : January 9, 2019
Information provided by (Responsible Party):
Yale University

Brief Summary:
The primary goal is to quantify cerebrospinal fluid (CSF) volume, diffusion characteristics and mechanical properties of brain tissue at two states of arousal.

Condition or disease Intervention/treatment Phase
Cerebrospinal Fluid Pressure Increased Drug: Dexmedetomidine Early Phase 1

Detailed Description:

The primary goal is to quantify cerebrospinal fluid (CSF) volume, diffusion characteristics and mechanical properties of brain tissue at two states of arousal:

  1. Resting, awake state
  2. During sleep with low-dose intravenous infusion of dexmedetomidine (titrated to a Bispectral index (BIS) of 60-70)

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 10 participants
Intervention Model: Single Group Assignment
Intervention Model Description: This is a preliminary interventional trial in which participants will serve as their own controls.
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: The Influence of Dexmedetomidine Hypnosis on Cerebrospinal Fluid (CSF) Volume, Brain Diffusion and 'Stiffness' Characteristics
Estimated Study Start Date : March 30, 2019
Estimated Primary Completion Date : November 30, 2020
Estimated Study Completion Date : November 30, 2020

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: Dexmedetomidine induced sleep patients
All subjects will be measured for CSF volume, diffusion parameters and mechanical 'stiffness' of the brain during wakefulness and during sleep-induced with dexmedetomidine (DEXM).
Drug: Dexmedetomidine
The standard dosing of 1mcg/kg will be implemented over 10 minutes followed by a maintenance infusion of 0.2-1.0 titrated to a the target BIS (60-70) during the 20 minutes prior to MRI.
Other Name: DEXM

Primary Outcome Measures :
  1. CSF volume increase by 10% [ Time Frame: 2 hours 30 minutes ]
    We hypothesize that CSF volume (as measured by T1 relaxation) will expand by 10% with DEXM- induced sleep compared to wakefulness. The increase in CSF volume during DEXM-induced sleep occurs because DEXM lowers central norepinephrine tone and sleep causes an increase in the interstitial fluid (ISF) volume (cell volume shrinks). MRI will take place 30 minutes after dexmedetomidine infusion.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 40 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  1. Healthy Males or females between 18 and 40 years of age. Determined to be American Society of Anesthesiologist (ASA) 1 subjects.
  2. Ability to provide written informed consent.

Exclusion Criteria:

  1. Subjects with potential difficult airway as determined by the anesthesiologist
  2. History of or family history of difficulty with anesthesia or sedation procedures
  3. Known intolerance to dexmedetomidine
  4. Body mass index >30
  5. Subjects with any of the following: narcolepsy, obstructive sleep apnea (OSA) and/or abnormal sleeping patterns (including but not limited to those who use a Continuous positive Airway Pressure (C-PAP) machine, sleeping during the day, using medication to fall asleep, subjects reporting snoring as determined by self- report using Snoring, Tiredness, Observed apnea, Blood pressure, Body mass index, Age, Neck circumference and Gender (STOP-BANG) questionnaire (i) for undiagnosed OSA (3 or more 'yes' answers will exclude) and/or medical history;
  6. Subjects with a history of restless leg syndrome as determined by self-report and/or medical history;
  7. Use, in the past two weeks, of psychoactive medications (four weeks for fluoxetine) or medications that may affect brain function (including but not limited to opioid analgesics, antidepressants, antipsychotics, benzodiazepines and barbiturates) as determined by self-report and/or medical history;
  8. Current or past Diagnostic and Statistical Manual of Mental Disorders (DSM-V) diagnosis of a psychiatric disorder if it was severe enough to require the use of medications and or hospitalization to treat the condition.
  9. Major medical problems that can impact brain function (e.g., problems of the Central Nervous System including seizures and psychosis; cardiovascular disease including hypertension and arrhythmias; metabolic, autoimmune, endocrine disorders) as determined by self-report, medical history and/or clinical exam;
  10. Hepatic dysfunction or impairment as determined by subjects' self-reported history
  11. Head trauma with loss of consciousness for more than 60 minutes as determined by self-report and/or medical history;
  12. Positive urine test for controlled substances (cocaine, methamphetamine, amphetamines, opioids, cannabinoids, benzodiazepines and barbiturates) at the screening visit and at each visit of imaging study and neuropsychological assessment;
  13. Positive urine pregnancy test;
  14. Nursing mothers will be excluded
  15. Presence of ferromagnetic objects in the body that are contraindicated for MRI of the head (including but not limited to pacemakers or other implanted electrical devices, brain stimulators, some types of dental implants, aneurysm clips, metallic prostheses, permanent eyeliner, large tattoos, implanted delivery pump, or shrapnel fragments) or fear of enclosed spaces as determined by the self-report checklist.
  16. Fear of enclosed spaces (claustrophobia) as determined by self-report and medical history.
  17. Cannot lie comfortably flat on the back for up to 3 hours in the MRI scanner as determined by self- report.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03757897

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Contact: Victor Lan, MD 203-785-3177

Sponsors and Collaborators
Yale University
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Principal Investigator: Victor Lan, MD Yale University

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Responsible Party: Yale University Identifier: NCT03757897     History of Changes
Other Study ID Numbers: 2000024166
First Posted: November 29, 2018    Key Record Dates
Last Update Posted: January 9, 2019
Last Verified: January 2019

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Product Manufactured in and Exported from the U.S.: Yes
Keywords provided by Yale University:
Additional relevant MeSH terms:
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Intracranial Hypertension
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Hypnotics and Sedatives
Central Nervous System Depressants
Physiological Effects of Drugs
Analgesics, Non-Narcotic
Sensory System Agents
Peripheral Nervous System Agents
Adrenergic alpha-2 Receptor Agonists
Adrenergic alpha-Agonists
Adrenergic Agonists
Adrenergic Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action