Fentanyl Ultra Low Doses Effects on Human Volunteer's Nociceptive Threshold. Towards a Simple Pharmacological Test Able to Predict Pain Vulnerability, Post Operative Hyperalgesia Development Risk?

Detailed Summary

Exaggerated pain and hyperalgesia are major issues after surgery and can lead to chronic pain. Opioid are parts of pain sensitization processes but remain absolutely necessary in the intraoperative period. NMDA receptor antagonists succeed in reducing this pain sensitization process. Recent studies show that in pain and opioid-experienced rats (POER) fentanyl ultra low doses do not induce analgesia, as observed in naive rats, but hyperalgesia. This is the first demonstration that a drug can induce opposite effect depending on individual history. We also observed a strong correlation between this hyperalgesic response in POER and the intensity of hyperalgesia they develop later, after inflammatory or surgical pain. The main aim of this study is to measure the dose effect response to fentanyl "ultra low doses" on human volunteer's nociceptive threshold, to determine if such an opposite response profile can be revealed.

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