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Inflammatory, hemostatic, and clinical changes in a baboon experimental model for heatstroke
A Bouchama1, G Roberts, F Al Mohanna
1Dept. of Comparative Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia. bouchamaus@yahoo.com
Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 12, 2004
Summary
This study developed a baboon model for heatstroke, revealing that inflammation and coagulation issues predict survival. This model is suitable for testing immunomodulatory therapies to improve heatstroke outcomes.
Area of Science:
- Physiology
- Toxicology
- Immunology
Background:
- Heatstroke mortality and morbidity are linked to inflammatory and hemostatic responses.
- Immunomodulation is a potential therapeutic strategy for improving heatstroke outcomes.
Purpose of the Study:
- To establish an experimental baboon model of heatstroke.
- To investigate the host's inflammatory and hemostatic responses to heat stress.
- To assess the suitability of the baboon model for testing therapeutic strategies.
Main Methods:
- Eight juvenile baboons were subjected to controlled heat stress to induce moderate or severe heatstroke.
- Four baboons served as a sham-heated control group.
- Physiological parameters, plasma biomarkers (IL-6, thrombomodulin, creatinine, etc.), coagulation tests (PT, aPTT, D-dimer), and platelet counts were analyzed.
Main Results:
- Severe heatstroke was lethal in all baboons, while moderate heatstroke caused neurological morbidity but not mortality.
- Heat-stressed baboons exhibited systemic inflammation, activated coagulation, and cellular injury in multiple organs (liver, brain, gut).
- Nonsurvivors showed significantly higher coagulopathy, inflammation, and tissue injury compared to survivors.
Conclusions:
- The baboon model effectively replicates human heatstroke responses, including inflammation and coagulation.
- Distinct patterns of inflammatory and hemostatic responses correlate with heatstroke outcomes.
- This baboon model is appropriate for evaluating immunomodulatory treatments to mitigate heatstroke severity.
