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Related Experiment Videos

Preischemic hyperglycemia leads to delayed postischemic hyperthermia

H Uchino1, J Lundgren, M L Smith

  • 1Laboratory for Experimental Brain Research, University of Lund, Sweden.

Stroke
|September 1, 1994
PubMed
Summary
This summary is machine-generated.

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Hyperglycemic rats subjected to forebrain ischemia developed delayed hyperthermia and seizures, leading to increased mortality. Preventing this hyperthermia did not alter the fatal outcome, suggesting aggravated damage causes both conditions.

Area of Science:

  • Neuroscience
  • Physiology
  • Pathology

Background:

  • Temperature influences outcomes of transient ischemia, even post-insult.
  • Preischemic hyperglycemia worsens ischemic brain damage.
  • The relationship between hyperglycemia and postischemic hyperthermia is unclear.

Purpose of the Study:

  • To investigate if hyperglycemic animals develop hyperthermia after forebrain ischemia.
  • To determine the role of postischemic hyperthermia in seizure development and mortality.

Main Methods:

  • Forebrain ischemia was induced in normoglycemic and hyperglycemic rats under isoflurane anesthesia.
  • Body temperature was monitored telemetrically during and after the ischemic period.
  • Interventions like mannitol infusion, hypercapnia, cooling, and acetaminophen were used to explore contributing factors.

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Main Results:

  • Hyperglycemic rats exhibited delayed hyperthermia (above 39°C) and seizures, with invariably fatal outcomes.
  • Normoglycemic rats showed initial hypothermia followed by gradual temperature normalization.
  • Mannitol infusion and hypercapnia did not induce hyperthermia, ruling out osmotic load and acidosis as causes.
  • Preventing hyperthermia via cooling or acetaminophen did not prevent seizures or reduce mortality.

Conclusions:

  • Delayed hyperthermia and seizures in hyperglycemic rats are linked to aggravated ischemic brain damage.
  • Postischemic hyperthermia itself does not appear to be the primary driver of mortality in this model.