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D-Amphetamine Accelerates Recovery of Consciousness and Respiratory Drive After High-Dose Fentanyl in Rats.

Olivia A Moody1,2, Edlyn R Zhang1, Vipin Arora1,2

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|January 11, 2021
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d-amphetamine may offer a solution for fentanyl-induced respiratory depression and delayed consciousness. This study in rats showed d-amphetamine accelerated recovery and improved blood gases, suggesting it as an alternative to naloxone.

Keywords:
anesthesiaarterial blood gasd-amphetaminefentanylneurosciencerespiratory depression

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Toxicology

Background:

  • Fentanyl overdose causes significant deaths and respiratory depression in perioperative settings.
  • Naloxone, an opioid antagonist, is effective but has limitations like a short half-life and side effects.

Purpose of the Study:

  • To investigate if d-amphetamine can mitigate respiratory depression and speed up consciousness recovery after high-dose fentanyl exposure.
  • To test d-amphetamine as a potential alternative or adjunct to naloxone.

Main Methods:

  • Adult rats received high-dose fentanyl to induce respiratory depression and loss of righting reflex.
  • d-amphetamine or saline (vehicle) was administered intravenously.
  • Behavioral endpoints, arterial blood gas analysis, and prefrontal cortex local field potentials were recorded.

Main Results:

  • d-amphetamine significantly accelerated the return of righting reflex by 36.6% compared to controls.
  • d-amphetamine hastened the recovery of arterial pH, CO2, O2, and sO2 levels.
  • Brain activity recordings showed d-amphetamine rapidly restored baseline prefrontal cortex activity, correlating with consciousness return.

Conclusions:

  • d-amphetamine effectively attenuated respiratory acidosis and improved oxygenation in fentanyl-intoxicated rats.
  • d-amphetamine accelerated the return of consciousness, indicating potential therapeutic value.
  • d-amphetamine may serve as a viable adjunct or alternative to naloxone for managing fentanyl-induced respiratory depression.