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Related Experiment Videos

Imipramine reduces experimental pain.

B Bromm1, W Meier, E Scharein

  • 1Institute of Physiology, University Hospital Eppendorf, 2000 Hamburg 20 F.R.G.

Pain
|May 1, 1986
PubMed
Summary
This summary is machine-generated.

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Tricyclic antidepressant imipramine and narcotic meperidine both reduced pain, but imipramine acted with a delay. Fluradoline showed no significant analgesic effects in this study.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Pain Management

Background:

  • Tricyclic antidepressants (TCAs) are explored for analgesic properties beyond their primary psychiatric use.
  • Opioid analgesics like meperidine are standard pain relief but carry risks.
  • Understanding the comparative efficacy and mechanisms of different analgesics is crucial for pain management.

Purpose of the Study:

  • To compare the analgesic effects of imipramine (TCA) and meperidine (narcotic) in healthy subjects.
  • To investigate the efficacy of fluradoline, another TCA, as an analgesic.
  • To examine the neurophysiological correlates of pain relief using electroencephalography (EEG) and somatosensory evoked potentials (SSEPs).

Main Methods:

  • A double-blind, placebo-controlled, repeated-measures Latin Square design was employed.

Related Experiment Videos

  • Healthy male students received oral doses of imipramine (100 mg), meperidine (150 mg), fluradoline (450 mg), or placebo.
  • Phasic pain was induced via intracutaneous electrical stimulation, with pain ratings, SSEPs, and EEG power spectral density recorded.

    • Main Results:

    • Meperidine demonstrated rapid analgesia, peaking around 90 minutes.
    • Imipramine provided comparable pain reduction but with a significant delay of approximately 2 hours.
    • Both meperidine and imipramine decreased SSEP amplitudes and altered EEG activity (reduced alpha, increased slow waves), correlating with pain relief.
    • Fluradoline did not show significant analgesic effects on experimental pain.

    Conclusions:

    • Imipramine exhibits delayed analgesic effects comparable to meperidine, suggesting potential utility in pain management.
    • Neurophysiological changes in SSEPs and EEG accompany analgesia, offering insights into pain processing.
    • Fluradoline's efficacy as an analgesic could not be confirmed in this experimental model.