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Clinical Trial Summary

The management of pain endured by patients after skin grafting is complex. Pain is the single most distressing symptom but as it is difficult to manage, it is often under-treated. These patients may experience pain from two types of wound: the original injury and from "skin-donor" sites, areas of healthy skin from which skin is surgically removed and used to cover the original injury. As the section of skin which is removed is standardized, the wound created at the donor site is uniform and so provides a model of an acute wound. Opioids (such as morphine) are the backbone of treating the moderate to severe pain experienced by any patient. But due to their potentially severe side effects and that some patients do not experience sufficient relief from the treatment, optimal treatment schedules are still being sought after. Topically applied morphine has provided effective and safe analgesia in several clinical models. We, therefore, wish to apply this treatment modality onto skin-graft donor wounds. If found to be effective this could be an appealing non-invasive method to treat the pain of this type of wound.


Clinical Trial Description

Administration of morphine into the knee joint is the best-studied clinical procedure documenting the use of topically-applied opioids. When 1-5 mg morphine were injected into the knee joint, patients experienced pain relief for up to 24 hours, whereas similar doses given systemically (i.e. intravenously) were effective for 2-4 hours. Furthermore, the analgesic effect was reversed when the opioid antagonist naloxone was injected into the knee joint. Both these findings indicate that the effect is mediated by local opioid receptors in the knee joint. Peripheral analgesic effects of opioids are not detectable in normal tissue but appear minutes to hours after initiation of inflammation. This suggests that opioid receptors are already present in the peripheral nerve terminals but under normal conditions they are not functional. Research on application of opioids to skin wounds is very sparse and has primarily been performed in palliative care patients. These reports demonstrate that topical opioid gel (morphine or diamorphine) provided rapid and effective relief. In some patients pain subsided within 20 minutes after application with a long-lasting (7-8 hours) effect. Fundamental aspects regarding topical application of opioids onto skin wounds are still lacking. For example, issues such as optimal dose and dose-effect relationships have not been investigated. We hope to determine these in this study. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT00362219
Study type Interventional
Source Rambam Health Care Campus
Contact
Status Withdrawn
Phase Phase 3
Start date January 2022
Completion date December 2024

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