Effects of Pregabalin, Duloxetine & Amitriptyline on Pain & Sleep

Study Overview
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Brief Summary
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The purpose of this study is to assess the effectiveness of pregabalin, duloxetine and amitriptyline compared with placebo in reducing pain in diabetic patients as assessed by Brief Pain Inventory (BPI).

Detailed Description
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Little is understood concerning the interaction of pain with sleep. Pain may disrupt sleep leading to daytime sleepiness and poor sleep can increase the perception of pain. There is uncertainty concerning the most effective way in which medication could be used to ease pain and poor sleep in patients such as those with diabetic peripheral neuropathy. Various drugs have been tried or proposed, and these include amitriptyline, pregabalin and duloxetine. Amitriptyline is believed to relieve pain and improve sleep, though there is little evidence of its beneficial effects on sleep. Furthermore, even at low doses, it affects reaction time, attention, memory, information processing. In two studies with duloxetine, it has been shown to significantly reduce pain compared with placebo, although little data are available on the usefulness of this compound in the management of pain with poor sleep. Pregabalin has been shown to be effective in reducing pain, and therefore improving sleep. It has also been demonstrated that it has limited potential to affect daytime cognition. In another study gabapentin (a compound structurally related to pregabalin) demonstrated superior efficacy in the management of pain compared to amitriptyline. Therefore this study will assess the effectiveness of pregabalin, duloxetine and amitriptyline compared with placebo in reducing pain associated with diabetes and poor sleep. As the incidence of diabetes is predicted to increase in future years and as a consequence so will the cases of diabetic peripheral neuropathy (DPN), this research will serve to provide essential information on sleep and DPN which will be beneficial now and in the future.

Official Title
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A Double-blind, Randomised, Parallel Groups Investigation Into the Effects of Pregabalin, Duloxetine and Amitriptyline on Aspects of Pain, Sleep, and Next Day Performance in Patients Suffering From Diabetic Peripheral Neuropathy

Conditions
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Diabetes Mellitus, Peripheral Neuropathies

Intervention / Treatment
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* Drug: Pregabalin
* Drug: Duloxetine
* Drug: Amitriptyline


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: 18 years of age or above Have a diagnosis of Diabetes mellitus for at least a year Agree not to smoke whilst resident in the CRC Able to understand the patient information sheet and provide written informed consent Score above 12 on the LANSS Have neuropathic pain of diabetic origin Score above 25 on MMSE Willing to withdraw, under the guidance of their diabetologist, from any current pain medication prior to their first visit to the sleep laboratory. Duration of withdrawal will be at least equivalent to 5 half-lives and will be of a relevant duration given the particular medication used. Exclusion Criteria: There is evidence of an end stage disease of a major system (hepatic, renal, respiratory, haematologic (PA), immunologic, cardiovascular, inflammatory, rheumatology, active infections, peripheral vascular disease, untreated endocrine(hypothyroid) There is evidence of a recent ischaemic event There is evidence of recurrent and/or severe hypoglycemia requiring assistance in last 3 years Evidence of sleep pathology that would interfere with the assessment of treatment (assessed on habituation night) Currently receiving treatment for malignancy Suffer from seizures including epilepsy There is evidence of a history of dependence on or abuse of alcohol/recreational drugs Need to use a wheel chair (incompatible with studies in a sleep laboratory) Involved in a clinical trial in last 3 months Pregnant, lactating or inadequate contraception Vision inadequate for the performance tests (as assessed at screening) Colour Blind Will not co-operate with study procedures Will not give permission to inform GP

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Intervention/Treatment |
| --- |
|Drug: Pregabalin|capsule, 150mg bd, 300mg bd|
|Drug: Duloxetine|Capsule, 60mg on, 60mg bd|
|Drug: Amitriptyline|Capsule. 25 mg bd, 25 mg om and 50 mg on|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Whether there is a reduction in subjective pain as assessed by the Brief Pain Inventory. |  | December 2008 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Whether there has been an improvement in sleep continuity and subjective sleep, morning after cognitive and psychomotor performance, and quality of life (QoL). |  | December 2008 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Diabetic Peripheral Neuropathy