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Cerebrospinal fluid composition during endotoxin shock in the dog
Advances in Shock Research
|January 1, 1979
Summary
E. coli endotoxin shock in dogs caused a shift to anaerobic brain metabolism, indicated by elevated cerebrospinal fluid lactate. However, key electrolytes and proteins remained stable, showing no significant changes in brain membrane permeability or active transport processes.
Area of Science:
- Neuroscience
- Physiology
- Biochemistry
Background:
- Endotoxin shock can lead to systemic and cerebral metabolic disturbances.
- Understanding brain's metabolic response during shock is crucial for therapeutic interventions.
Purpose of the Study:
- To investigate the metabolic and electrolyte changes in the brain during endotoxin shock.
- To assess the impact of endotoxin shock on cerebrospinal fluid (CSF) and plasma parameters.
Main Methods:
- Monitoring of CSF and arterial plasma electrolytes, lactate, pyruvate, total proteins, and osmolality in dogs subjected to E. coli endotoxin shock.
- Measurement of systemic arterial blood pressure.
- Comparison with saline control experiments.
Main Results:
- CSF lactate and lactate/pyruvate ratio significantly increased, while pyruvate decreased during four hours of shock.
- Plasma and CSF electrolytes (Na+, K+), osmolarity, and total proteins remained unchanged.
- Systemic arterial blood pressure was consistently lower than control levels.
- Saline controls showed no significant alterations in monitored parameters.
Conclusions:
- The brain shifts towards anaerobic metabolism during endotoxin shock, evidenced by altered CSF lactate and pyruvate levels.
- Despite metabolic shifts, critical parameters like electrolytes and proteins in CSF and plasma remain stable.
- These findings suggest that the observed anaerobic metabolism is insufficient to disrupt brain membrane permeability or Na+/K+ active transport processes within the four-hour shock period.