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Skeletal muscle metabolites as possible indicators of imminent death in acute hemorrhage
Insights
Hemorrhagic shock severity correlates with tissue energy metabolism changes. Specifically, elevated lactate levels in skeletal muscle and blood indicate circulatory deterioration and impending death in cats.
Area of Science:
- Physiology
- Biochemistry
- Pathophysiology
Background:
- Hemorrhagic shock significantly impacts tissue energy metabolism.
- Understanding metabolic changes is crucial for assessing shock severity.
Purpose of the Study:
- To investigate the correlation between tissue energy metabolism and hemorrhagic shock severity.
- To identify key metabolic markers indicative of circulatory deterioration.
Main Methods:
- Inducing hemorrhagic shock in cats by withdrawing 50% blood volume within 10 minutes.
- Collecting skeletal muscle and blood samples at baseline and during the agonal phase or after 2 hours.
- Enzymatically determining tissue and blood levels of metabolites including ATP, CrP, G-6-P, glucose, lactate, and pyruvate.
Main Results:
- No significant depletion of phosphagen (ATP and CrP) levels was observed in the agonal phase.
- Elevated levels of glycolytic metabolites, particularly lactate, showed a strong correlation with the progression of circulatory deterioration.
- Blood glucose and pyruvate levels also reflected the severity of the shock condition.
Conclusions:
- Tissue and blood lactate levels are reliable indicators of hemorrhagic shock severity and prognosis.
- While phosphagen stores remain relatively stable, glycolytic pathway activation is a key metabolic response to severe hemorrhagic shock.
Abstract:
The extent to which changes in tissue energy metabolism correspond to the severity of a hemorrhagic shock condition has been studied. In cats, 50% of the blood volume was withdrawn within 10 min, resulting in a fatal outcome within 3h (range from 45 min to 3 h). Skeletal muscle and blood samples were taken prior to the hemorrhagic and in the agonal phase or after 2 h in compensated bled animals. Tissue levels of ATP, CrP, G-6-P, lactate and glucose as well as blood levels of glucose, lactate and pyruvate were determined enzymatically. The results showed no depletion of phosphagen levels in the agonal phase, while glycolytic metabolites, lactate in particular, demonstrated a close correlation to circulatory deterioration and imminent death.