QST in Context With Conditioned Pain Modulation (CPM)

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: NCT01618604
Recruitment Status : Completed
First Posted : June 13, 2012
Last Update Posted : January 3, 2013
Information provided by (Responsible Party):
Christoph Maier, Prof. Dr., Ruhr University of Bochum

Brief Summary:

Conditioned Pain Modulation (CPM) is a phenomenon which isn't examined enough. Many factors of influence such as gender, age and psyche are already known - but the duration of such effects, their reliability and the correlation between standardized Quantitative Sensory Testing (QST) and CPM is still unknown.

In this study the investigators expect to find parameters in QST that correlate with the efficacy of Conditioned Pain Modulation. Knowing factors that indicate high or low potential CPM could help finding patients-at-risk and adapting their therapy.

Condition or disease Intervention/treatment
Healthy Procedure: Quantitative Sensory Testing Procedure: Conditioned Pain Modulation Procedure: Repetition of four QST parameters

Detailed Description:

Conditioned Pain Modulation was firstly found in rats by electrical stimulation of their spinal cord and called Diffuse Noxious Inhibitory Controls. In humans such experimental settings are impossible. That is why we need two noxious stimuli for provoking such an endogenous pain inhibition.

Before the CPM setting begins, we will investigate our 32 healthy probands by basic QST following the protocol of DFNS (German Research Network on Neuropathic Pain). This assessment helps us to create a sensory profile for every proband and to look for correlations between QST parameters and CPM efficacy. Then the CPM setting follows. In our experimental design we use a test stimulus (TS) on the dominant forearm by thermode (normally 45-47°C, depending on the pain rating, we need scores >NRS 60) and a conditioned stimulus (CS) on the other hand by cold water bath (10°C). Both stimuli must be rated on the numerical rating scale (NRS) 0-100 alone and in combination. A positive effect can be seen, if the difference between TS alone and TS in combination with CS is >0. To learn more about the duration of CPM effects we decided to repeat four QST parameters (cold detection threshold, warm detection threshold, mechanical detection threshold and mechanical pain threshold) within 30 minutes after finishing the CPM part to detect changes of time.

The whole study design will be repeated 24-72h hours later to increase the test-retest-reliability.

Study Type : Observational
Actual Enrollment : 26 participants
Observational Model: Case-Only
Time Perspective: Prospective
Official Title: Quantitative Sensory Testing in Context With Conditioned Pain Modulation (CPM)
Study Start Date : May 2012
Actual Primary Completion Date : December 2012
Actual Study Completion Date : December 2012

Group/Cohort Intervention/treatment
26 healthy voluntary probands
Procedure: Quantitative Sensory Testing
following the standardized protocol of DFNS
Other Name: QST
Procedure: Conditioned Pain Modulation
test stimulus by hot thermode conditioned stimulus by cold water bath
Other Names:
  • CPM
  • DNIC
  • Diffuse Noxious Inhibitory Controls
Procedure: Repetition of four QST parameters
  • warm detection threshold (WDT)
  • cold detection threshold (CDT)
  • mechanical detection threshold (MDT)
  • mechanical pain threshold (MPT)
Other Names:
  • WDT
  • CDT
  • MDT
  • MPT
  • Quantitative Sensory Testing

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
Healthy voluntary probands

Inclusion Criteria:

  • healthy probands >18 years
  • right-handedness
  • informed consent
  • no chronic pain
  • no drugs (but oral contraceptives)
  • no neurological diseases
  • no psychiatric diseases

Exclusion Criteria:

  • no informed consent
  • language deficits
  • left-handedness
  • not enough pain intensity by thermode or cold water bath
  • psychiatric disease, neurological diseases other chronic disease
  • chronic pain syndromes
  • pregnancy or lactation
  • permanent drug use, drug use in the last 14 days

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): NCT01618604

Bergmannsheil, department for pain management
Bochum, Nordrhein-Westfalen, Germany, 44789
Sponsors and Collaborators
Ruhr University of Bochum
Study Director: Christoph Maier, Prof. Dr. med University hospital Bergmannsheil department of pain management

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Christoph Maier, Prof. Dr., Head of the Dep. of Pain Management, Ruhr University of Bochum Identifier: NCT01618604     History of Changes
Other Study ID Numbers: CPM2012
First Posted: June 13, 2012    Key Record Dates
Last Update Posted: January 3, 2013
Last Verified: December 2012

Keywords provided by Christoph Maier, Prof. Dr., Ruhr University of Bochum:
Conditioned Pain Modulation
Quantitative Sensory Testing