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Brain tissue pH after global brain ischemia and barbiturate loading in rats
Stroke
|January 1, 1981
Summary
Thiopental loading after global brain ischemia in rats did not improve brain tissue pH normalization. The study found no significant difference in pH recovery between thiopental-treated and control groups following reperfusion.
Area of Science:
- Neuroscience
- Physiology
- Pharmacology
Background:
- Global brain ischemia can lead to significant alterations in brain tissue pH.
- Understanding postischemic recovery is crucial for developing effective therapeutic strategies.
Purpose of the Study:
- To investigate whether thiopental administration after transient global brain ischemia accelerates brain tissue pH normalization in rats.
Main Methods:
- Rats underwent 16 minutes of global brain ischemia induced by hypotension and neck cuff.
- Brain tissue pH was monitored using microelectrodes in the parietal cortex.
- Thiopental was administered to a subset of rats starting 5 minutes postischemia.
Main Results:
- Brain pH rapidly decreased during ischemia and showed a transient further drop upon reperfusion.
- Thiopental infusion did not significantly alter the rate of brain pH normalization compared to controls.
- Brain tissue pH returned to preischemic values by 60 minutes postischemia in both groups.
Conclusions:
- Postischemic thiopental loading does not enhance the normalization of brain tissue pH following transient global brain ischemia.
- The transient decrease in pH during reperfusion, indicative of lactic acidosis, warrants further discussion and investigation.