Hyperalgesia in Methadone-Maintained Patients: Can it be Treated?
试验速览
- 阶段
- 2 期
- 状态
- 已完成
- 入组人数
- 26
- 试验地点
- 1
- 主要终点
- Change in Pain Threshold Time From Baseline to Week 5
研究概览
简要总结
Utilizing a double-blind, placebo-controlled design, the proposed work will evaluate the ability of an adjuvant anticonvulsant analgesic to diminish or reverse the opioid-induced hyperalgesia complicating the pain states suffered by Methadone-Maintained (MM) patients. Specifically, in a sample of MM patients, gabapentin, which has proven efficacy in treating neuropathic pain will be evaluated for its ability to ameliorate or diminish the opioid-induced hyperalgesia in these patients as reflected by changes on pain threshold and tolerance to both cold-pressor and electrical pain, at peak and through methadone blood levels. The results of this work will not only provide pharmacologic insight into the mechanisms underlying poor pain tolerance in this at-risk population, but also direction for the medical management of pain complicated by opioid-induced hyperalgesia.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Triple (Participant, Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 21 Years 至 55 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Potential participants must:
- •Be between the ages of 21 and 55 years of age.
- •DSM-IVR diagnosis of prescription opioid abuse or dependence disorder
- •Be compliant in methadone treatment
- •On a stable dose of methadone at least 6 weeks.
- •Have provided random urine samples absent of any non-prescribed drugs of abuse x 2 months
- •Be in good physical health or in the case of a medical condition needing ongoing treatment, be in the care of a physician who is willing to take responsibility for such treatment. The same conditions apply in cases of patients with a psychiatric disorder needing ongoing treatment.
- •Be agreeable to and capable of signing an informed consent.
排除标准
- •Potential participants must not:
- •Have known sensitivity to gabapentin.
- •Be substance dependent on alcohol, benzodiazepine, methamphetamine, cocaine or other drugs of abuse (except nicotine).
- •Have any acute medical condition that would make participation medically hazardous, (e.g., acute hepatitis, unstable cardiovascular disease, liver or renal disease) or have liver enzyme values (AST or ALT) greater than 5 times normal range.
- •Be acutely psychotic, severely depressed and in need of inpatient treatment, or an immediate suicide risk.
- •Have a neurological or psychiatric illness (i.e., schizophrenia, Raynaud's disease, urticaria, stroke) that would affect pain responses.
- •Be currently taking opioid analgesic medication for a painful condition on a regular basis.
- •Be a nursing or pregnant female. Female of childbearing potential must agree to use a medically acceptable method of birth control, (e.g. oral contraceptives, barrier (diaphragm or condom) with or without spermicide, levonorgestrel implant, intra-uterine progesterone contraceptives system, medroxyprogesterone acetate contraceptive injection) or to complete abstinence. Females who become pregnant during the course of the study will be dropped from the study.
- •Have a current or past history of high blood pressure, heart disease, stroke or currently have a pacemaker.
研究组 & 干预措施
Gabapentin
干预措施: Gabapentin; (Drug)
Placebo
干预措施: Placebo (Drug)
结局指标
主要结局
Change in Pain Threshold Time From Baseline to Week 5
时间窗: baseline, 5 weeks
Change in pain threshold time from baseline (pre-gabapentin) to week 5 (post gabapentin)measured during cold pressor task administered at peak methadone blood levels. Pain threshold time is the amount of time that passes before pain is detected after administration of the cold pressor.
次要结局
未报告次要终点
研究者
Peggy Compton
Professor, Associate Dean for Academic Affairs
University of California, Los Angeles