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Drastic decrease in isoflurane minimum alveolar concentration and limb movement forces after thoracic spinal cooling

Steven L Jinks1, Carmen L Dominguez, Joseph F Antognini

  • 1Department of Anesthesiology and Pain Medicine, University of California School of Medicine, Davis 95616, USA. sljinks@ucdavis.edu

Anesthesiology
|February 26, 2005
PubMed
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Spinal cord injury significantly increases the anesthetic potency of isoflurane, reducing required doses. This effect is linked to spinal cord changes, not just motor function loss, and may evolve with neuronal plasticity.

Area of Science:

  • Anesthesiology
  • Neuroscience
  • Spinal Cord Injury Research

Background:

  • Spinal cord injury (SCI) often necessitates multiple surgeries.
  • Anesthetic requirements and movement force under anesthesia in SCI patients are not well understood during acute and chronic injury phases.

Purpose of the Study:

  • To investigate the impact of SCI on anesthetic requirements.
  • To assess changes in movement force under anesthesia following SCI.
  • To evaluate these effects during both acute and chronic SCI stages.

Main Methods:

  • Determined isoflurane minimum alveolar concentration (MAC) to block movement post-thoracic spinal transection.
  • Measured tail-flick and hind paw withdrawal latencies before and up to 28 days after transection.
  • Assessed limb forces and utilized reversible spinal conduction block via cooling.

Related Experiment Videos

Main Results:

  • MAC decreased significantly (to ≤40%) after spinal transection, with partial recovery (to ~60%) by 14-28 days.
  • Reflex latencies were depressed or absent under isoflurane, despite unchanged or facilitated awake latencies.
  • Hind limb forces were markedly reduced (>90%) in both acute and chronic spinal block models.

Conclusions:

  • Isoflurane's immobilizing potency significantly increases post-SCI, independent of baseline motor depression ('spinal shock').
  • Anesthetic requirements are influenced by spinal depressant actions potentially counteracted by supraspinal facilitation.
  • Neuronal plasticity following SCI appears to modulate anesthetic needs over time.