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Related Experiment Videos

An innovative cold tail-flick test: the cold ethanol tail-flick test

J J Wang1, S T Ho, O Y Hu

  • 1Department of Anesthesiology, National Defense Medical Center, Taipei, Taiwan, Republic of China.

Anesthesia and Analgesia
|January 1, 1995
PubMed
Summary

A new cold ethanol tail-flick test (CET) effectively measures opioid analgesic effects. This sensitive and specific method accurately identifies antinociceptive activity in opioid agonists and mixed agonists-antagonists.

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Area of Science:

  • Pharmacology
  • Neuroscience
  • Pain Research

Background:

  • Assessing the antinociceptive properties of analgesics is crucial for pain management.
  • Existing methods for evaluating opioid analgesics have limitations in sensitivity or specificity.
  • There is a need for a reliable and reproducible assay to screen and characterize opioid-induced pain relief.

Purpose of the Study:

  • To develop and validate an innovative antinociceptive test, the cold ethanol tail-flick test (CET).
  • To determine the optimal operating temperature for the CET as a noxious cold stimulus.
  • To evaluate the sensitivity and specificity of the CET using various classes of analgesics and sedatives.

Main Methods:

  • Screening of temperatures from -5°C to -30°C to identify an effective range for the cold ethanol tail-flick test.

Related Experiment Videos

  • Utilizing -20°C as the noxious cold stimulus in the developed CET.
  • Challenging the CET's sensitivity and specificity with opioid agonists (morphine), agonist-antagonists (buprenorphine, nalbuphine), tranquilizers (droperidol, diazepam), and nonopioid analgesics (acetaminophen, aspirin, indomethacin, ketoprofen).
  • Comparing the CET's sensitivity with heat-based assays (radiant heat, hot water).
  • Administering naloxone, an opioid antagonist, to assess its effect on opioid-induced antinociception within the CET.

    • Main Results:

    • Temperatures between -20°C and -30°C were identified as effective noxious cold stimuli for the CET.
    • The CET demonstrated high sensitivity and specificity, accurately distinguishing the antinociceptive effects of opioid analgesics.
    • Specific AD50 values were determined for morphine (0.16 mg/kg), buprenorphine (0.22 µg/kg), and nalbuphine (0.19 mg/kg).
    • Naloxone effectively blocked the antinociceptive effects of tested opioids in the CET.
    • Tranquilizers and nonopioid analgesics did not elicit antinociceptive responses in the CET.

    Conclusions:

    • The cold ethanol tail-flick test (CET) is a sensitive, specific, simple, and reproducible method for assessing antinociceptive activity.
    • The CET can effectively evaluate both opioid agonists and mixed agonist-antagonists.
    • This novel assay provides a valuable tool for pharmacological research on pain and analgesia.