Analgesic Tolerance to Repeated Doses of Subcutaneous Morphine
Tracking Information | |||||||||
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First Received Date ICMJE | November 16, 2005 | ||||||||
Last Updated Date | April 12, 2011 | ||||||||
Start Date ICMJE | March 2005 | ||||||||
Primary Completion Date | December 2006 (final data collection date for primary outcome measure) | ||||||||
Current Primary Outcome Measures ICMJE |
To investigate the time course of development of analgesic tolerance (loss of pain relieving effect) to morphine on experimentally produced skin tenderness in healthy volunteers. | ||||||||
Original Primary Outcome Measures ICMJE | Same as current | ||||||||
Change History | Complete list of historical versions of study NCT00256347 on ClinicalTrials.gov Archive Site | ||||||||
Current Secondary Outcome Measures ICMJE |
To expand the knowledge about the analgesic (pain relieving) effects of opioids on experimentally induced pain and further validate the Brief Thermal Sensitization model as a tool for testing analgesic drugs. | ||||||||
Original Secondary Outcome Measures ICMJE | Same as current | ||||||||
Current Other Outcome Measures ICMJE | |||||||||
Original Other Outcome Measures ICMJE | |||||||||
Descriptive Information | |||||||||
Brief Title ICMJE | Analgesic Tolerance to Repeated Doses of Subcutaneous Morphine | ||||||||
Official Title ICMJE | Development of Analgesic Tolerance to Repeated Doses of Subcutaneous Morphine Using the Brief Thermal Sensitization Model in Healthy Volunteers | ||||||||
Brief Summary | 30 healthy volunteers will be enrolled in this 6-session study. The first visit will be a screening/orientation session. The next 5 visits will be (full day) outpatient sessions taking place Monday through Friday during one week. All full day visits will be drug administration sessions with subjects randomized to one of two groups. The primary purpose is to investigate the time course of development of analgesic tolerance (loss of pain relieving effect) to morphine on experimentally produced skin tenderness in healthy volunteers. |
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Detailed Description | 30 healthy volunteers will be enrolled in this 6-session study. The first visit will be a screening/orientation session. The next 5 visits will be (full day) outpatient sessions taking place Monday through Friday during one week. All full day visits will be drug administration sessions with subjects randomized to one of two groups. Group A will receive two daily intramuscular injections of 8 mg morphine on Monday through Thursday and two intramuscular injections of placebo on Friday. Group B will receive two daily intramuscular injections of placebo on Monday through Thursday and two intramuscular injections of 8 mg morphine on Friday. During the Monday through Friday sessions the painfulness of experimental heat application and the area of skin tenderness (primary and secondary hyperalgesia) will be assessed before and two times after the intramuscular injections. Heat will be applied by using a computer controlled probe that applies heat (450 C/1130 F) on the thigh for 3 minutes (Brief Thermal Sensitization model.) |
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Study Type ICMJE | Interventional | ||||||||
Study Phase | |||||||||
Study Design ICMJE | Allocation: Randomized Intervention Model: Crossover Assignment Masking: Double-Blind |
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Condition ICMJE | Healthy Volunteers | ||||||||
Intervention ICMJE | Drug: intramuscular injections of morphine | ||||||||
Study Arm (s) | |||||||||
Publications * | |||||||||
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline. |
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Recruitment Information | |||||||||
Recruitment Status ICMJE | Completed | ||||||||
Enrollment ICMJE | 30 | ||||||||
Completion Date | December 2006 | ||||||||
Primary Completion Date | December 2006 (final data collection date for primary outcome measure) | ||||||||
Eligibility Criteria ICMJE | Inclusion Criteria:
Exclusion Criteria:
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Gender | Both | ||||||||
Ages | 21 Years to 50 Years | ||||||||
Accepts Healthy Volunteers | Yes | ||||||||
Contacts ICMJE | Contact information is only displayed when the study is recruiting subjects | ||||||||
Location Countries ICMJE | United States | ||||||||
Administrative Information | |||||||||
NCT Number ICMJE | NCT00256347 | ||||||||
Other Study ID Numbers ICMJE | H5612-25135, H5612-25135 | ||||||||
Has Data Monitoring Committee | |||||||||
Responsible Party | |||||||||
Study Sponsor ICMJE | University of California, San Francisco | ||||||||
Collaborators ICMJE | |||||||||
Investigators ICMJE |
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Information Provided By | University of California, San Francisco | ||||||||
Verification Date | March 2011 | ||||||||
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP |