Effects of halothane, α-chloralose, and pCO2 on injury volume and CSF β-endorphin levels in focal cerebral ischemia

J. L. Browing, M. L. Heizer, M. A. Widmayer, D. S. Baskin

Research output: Contribution to journalArticle

14 Scopus citations


Anesthetic agent, arterial pCO2 level and opioid peptides have all been implicated in the pathophysiology of experimental stroke models. The effects of halothane, α-chloralose, and differing concentrations of arterial pCO2 on injury volume and CSF β-endorphin levels were studied in a feline model of experimental focal cerebral ischemia. The type of anesthetic agent used had no effect on injury volume following 6 h of focal cerebral ischemia. Over a 6-h period, β-endorphin levels significantly increased from 10.1 ± 5.0 fmol/mL at zero time to 14.4 ± 7.2 fmol/mL at 6 h under halothane anesthesia (p < 0.05), whereas they did not significantly change (10.1 ± 6.7 to 7.8 ± 4.7 fmol/mL) under α-chloralose anesthesia. In contrast, hypercapnia had no effect on β-endorphin levels, but significantly increased injury volume from 30.6 ± 5.7% of the ipsilateral hemisphere under normocapnic conditions to 37.1 ± 5.9% under hypercapnic conditions (p < 0.05). These results suggest that hypercapnia increases injury volume in a feline model of focal cerebral ischemia, and pCO2 should be controlled in experimental focal cerebral ischemia models.

Original languageEnglish (US)
Pages (from-to)29-42
Number of pages14
JournalMolecular and Chemical Neuropathology
Issue number1
StatePublished - May 1997


  • α-Chloralose
  • β-endorphin
  • Anesthesia
  • Cerebral ischemia
  • Halothane
  • Hypercapnia
  • pCO

ASJC Scopus subject areas

  • Clinical Neurology
  • Molecular Biology
  • Neuroscience(all)

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