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Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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Synthetic and semisynthetic opioids are pivotal in pain management and tackling opioid addiction. Semisynthetic opioids, including morphinans (morphine derivatives), oxycodone, oxymorphone, hydrocodone, and hydromorphone, have improved pharmacokinetic profiles compared to morphine. Additionally, heroin and 6-MAM (6-Monoacetylmorphine) show better CNS penetration than morphine due to heightened lipid solubility. Hydromorphone, a potent opioid, undergoes hepatic metabolism to form the active...
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Area of Science:

  • Neurology
  • Toxicology
  • Neuroscience

Background:

  • The opioid epidemic presents a growing challenge to medical professionals.
  • Opioid-associated neurological injuries are increasingly prevalent.
  • Classic opioid toxicity symptoms (miosis, altered mental status, respiratory depression) are reversible and life-saving.

Purpose of the Study:

  • To highlight the spectrum of neurological injuries associated with opioid use.
  • To emphasize the importance of recognizing both classic and idiosyncratic opioid toxicity syndromes.
  • To inform neurologists about diagnostic challenges posed by newer synthetic opioids.

Main Methods:

  • Review of clinical presentations and diagnostic findings in opioid-associated neurological injuries.
  • Analysis of characteristic imaging findings for specific opioid-related syndromes.
  • Discussion of neurotoxic effects on the central and peripheral nervous systems.

Main Results:

  • Opioid toxicity can cause diverse neurological injuries, including brain, spinal cord, and peripheral nerve damage.
  • Idiosyncratic syndromes with specific imaging findings are associated with variable functional recovery.
  • Newer synthetic opioids may evade standard toxicological assays, necessitating a high index of suspicion.

Conclusions:

  • Practicing neurologists must maintain a low threshold for suspecting opioid exposure.
  • Recognition of a broad range of opioid-induced neurological damage is essential for effective management.
  • Understanding opioid neurotoxicity is critical for addressing the ongoing opioid epidemic.