Assessment of Opioid Analgesia in Sickle Cell

Status Withdrawn

Clinical Trial Summary

To develop and validate a non-invasive, in vivo, phenotyping method for CYP2D6 using the non-injurious neuroselective electrical stimulation technique: pain perception threshold/pain tolerance threshold (PPT/PTT) in children and adolescents with sickle cell disease.

Clinical Trial Description

Codeine is a pro-drug with its analgesic activity being dependent on the metabolism of codeine to morphine. The metabolism of codeine to morphine is catalyzed by the cytochrome P450 enzyme 2D6 (CYP2D6) of which there are over 70 genetic variants leading to differing metabolic capabilities within populations. It is hypothesized that the changes in PPT/PTT will vary based on the individuals ability to convert morphine to codeine.

Ineffective analgesic management of patients with sickle cell disease remains a major problem in the management of the disorder in both adults and children. The pharmacological treatment of acute and chronic pain conditions resulting from vaso-occlusive crises in children with sickle cell disease typically involves the use of opioids. In the outpatient setting, this is most commonly achieved with administration of codeine and/or tramadol, both substrates of cytochrome P450 2D6 (CYP2D6). Currently these drugs are used in this patient population without any information concerning the patient's capacity to metabolize these CYP2D6 substrates which may lead to over and under treatment of pain depending on their CYP2D6 activity. The proposed objectives in this application will address this issue by the development of a pharmacodynamic assessment tool that will objectively assess the response to morphine in terms of analgesic response (pharmacodynamic assessment). This new tool might also serve as a non-invasive technique for CYP2D6 phenotyping if CYP2D6 substrates are used for pain therapy by assessing specifically morphine response. Development of this novel assessment tool will result in improved opioid analgesic therapy in this population. Future anticipated studies will examine the application of this technique in the determination of opioid tolerance and hyperalgesia. ;

Study Design

Allocation: Randomized, Intervention Model: Crossover Assignment, Masking: Open Label, Primary Purpose: Basic Science

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT00513864
Study type	Interventional
Source	Children's Research Institute
Contact
Status	Withdrawn
Phase	Phase 4
Start date	November 2006
Completion date	March 2012

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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.