COVID-19 is an emerging, rapidly evolving situation.
Get the latest public health information from CDC:

Get the latest research information from NIH: Menu

Morphine Modulation of The Brain's Pain Matrix (Mor2010)

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. Read our disclaimer for details. Identifier: NCT01245244
Recruitment Status : Completed
First Posted : November 22, 2010
Last Update Posted : September 21, 2012
Information provided by (Responsible Party):
University of Aarhus

Brief Summary:

The aim of the current project is to use a model of painful stimulation of skin, muscles and internal organs, where it is possible to measure activity in the brain centers that process pain simultaneously. Magnetic resonance imaging and electroencephalography are combined to optimize the anatomical and physiological description of brain activation. During administration of morphine we will identify how different brain areas are affected. This knowledge will be used to:

1. Understand the mechanisms of morphine to a greater extent than is possible today, including:

  1. to investigate the mechanisms of morphine versus placebo on pain signals in the spinal cord and brain. This is done by a combination of experimental pain models, neurophysiological and imaging techniques (EEG and fMRI). This can be achieved as both subjective and objective measures of the analgesic effect.
  2. to examine morphines effect on communication between the centers of the brain that are involved in painprocessing .
  3. modeling of morphine pharmacokinetics (the understanding of what the body does to the drug, such as. concentration in the blood and the brain), since this is central to understand the pharmacodynamics (the description of what the drug does to the body and thus the effect it has).
  4. to identify biomarkers that can predict whether healthy subjects respond to morphine by experiencing an analgesic effect.

Condition or disease Intervention/treatment Phase
Pain Drug: Morphine Other: orange juice Phase 4

Detailed Description:

The tests will consist of one main study (I) and one sub-study (i):

I) Experiments in the painlaboratory in the gastroenterology clinic, where 40 healthy subjects will be examined with different pain tests i) Experiments in the MRI scanner, where only 20 of the 40 from the main study will be investigated in a more simple pain model. The individuals who also participate in MRI studies, will consist of those who first sign up

An equal distribution of men and women is wanted. The trial will be a double-blind, placebo-controlled crossover study in which all subjects will be investigated on two seperate days and receive respectively placebo or morphine in random order

Skin stimulation

Skin will be stimulated with thermal and electrical stimuli. Stimulated by:

  • Thermal stimuli by the skin stimulated with heat with an approved termotester (Medoc termotest) or with cold, by a hand or foot immersed in ice water. This harmless ice water test is further possible to evaluate DNIC (diffuse noxious Inhibitory controls) which is part of the pain system descending inhibitory system.
  • Electrical stimulation of the skin will be done by: 1) to the skin of the forearm stimulated electrically through two small surface electrodes (each approx. One cm2). There are stimulated to pain threshold, 2) via surface electrodes placed under the foot. This activates the nociceptive avert reflex as recorded by electrodes placed on the leg.

Muscle stimulation

The muscles can be stimulated by:

• mechanical stimuli by pressing the muscle with an approved pressure algometer (Somedic produktion AB, Sweden). There is an upper limit for the pressure to avoid injury.

Bone stimulation

Bone associated pain can be studied by:

• mechanical stimuli by pressing the right shin bone 15cm below the patella, medial of the tibia. Pressed with a handheld trykalgometer (Type 2, Somedic produktion AB, Sweden) with a probe size of 2mm in diameter until trial participants reach their pain tolerance threshold.

Visceral stimuli Stimuli to the rectum will be performed through the probe specifically designed for this purpose.

  • mechanical stimuli will be applied by water filling a balloon which is glued on the probe. The balloon on the probe is extended to moderate pain. The expansion is done by slowly filling the balloon with 37 degrees hot water.
  • Thermal stimuli will be applied by flushing the balloon with hot water (60 ° C)
  • Electrical stimuli will be applied by stimulation of the mucosa with weak electrical currents (Less than 80 mA) through electrodes on the probe. This stimulus is also used for recording of evoked brain potentials.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 40 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Basic Science
Official Title: Morphine Modulation of The Brain's Pain Matrix
Study Start Date : October 2010
Actual Primary Completion Date : September 2012
Actual Study Completion Date : September 2012

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: Morphine Drug: Morphine
Morphine oral mixture
Other Name: Morphine hydrochloride oral solution 2 mg/ml

Placebo Comparator: Placebo Other: orange juice
orange juice
Other Name: orange juice solution

Primary Outcome Measures :
  1. Morphine modulation of composite pain assessments [ Time Frame: october 2010 - december 2012 ]

Secondary Outcome Measures :
  1. Side effects of morphine [ Time Frame: october 2010 - december 2012 ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   20 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  1. Signed and dated "Written informed consent"
  2. Age between 20 and 65.
  3. Caucasian
  4. That it is in the researcher's belief that the subject fully understand the contents of the study and is willing and able to comply with instructions, have the opportunity to meet with visitors, and is expected to complete the entire study. Further, it is in the researcher's beliefs (by which demanded strict action to exclusion criterion 4 and 5) that subjects with abusive tendencies are not included .
  5. The person must be healthy ie. without previous chronic or recurrent pain rewarding diseases. Including the person must have:

    1. a blood pressure is 140/90 or less. If not satisfied, a medical assessment to determine whether the person is still included, albeit with a comment and reasons recorded in the CRF.
    2. a resting heart rate of at least 45 bpm. minute (measured after 5 minutes of recumbent rest). If not satisfied, a medical assessment to determine whether the person is still included, albeit with a comment and reasons recorded in the CRF.
  6. That women use safe contraceptive methods as the pill, coil, depot injection of progestin subdermal implantation, hormonal vaginal ring and transdermal patch.
  7. Negative pregnancy test prior to the conclusion of the experiment

Exclusion Criteria:

  1. Pregnancy.
  2. Known allergy to study medication
  3. Current or previous participation in another drug trial within 30 days before screening.
  4. Former participation in trials when given morphine or morphine-like substances.
  5. Former addiction behaviors defined as abuse of alcohol, marijuana, opiates or other narcotics or family members who have been / are a drug addict.
  6. Earlier pain rewarding or mental illness.
  7. Expected need for medical treatment, surgery or hospitalization during the study
  8. Concomitant use of strong pain medications
  9. Use of any analgesics 24 hours before each test.

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): NCT01245244

Layout table for location information
Department of Gastroenterology, Aalborg Hospital
Aalborg, Denmark, 9000
Sponsors and Collaborators
University of Aarhus
Layout table for investigator information
Study Chair: Anne E Olesen, PhD Aalborg University Hospital
Publications automatically indexed to this study by Identifier (NCT Number):
Layout table for additonal information
Responsible Party: University of Aarhus Identifier: NCT01245244    
Other Study ID Numbers: 2010-020894-17
First Posted: November 22, 2010    Key Record Dates
Last Update Posted: September 21, 2012
Last Verified: September 2012
Additional relevant MeSH terms:
Layout table for MeSH terms
Pharmaceutical Solutions
Analgesics, Opioid
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents