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Related Experiment Videos

Elevated pyrogenic cytokines in heatstroke

A Bouchama1, S al-Sedairy, S Siddiqui

  • 1Department of Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.

Chest
|November 1, 1993
PubMed
Summary
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Elevated levels of interleukin-6 (IL-6), interleukin-1 beta (IL-1 beta), and interferon gamma (INF-gamma) are linked to heatstroke severity. These cytokines may play a role in heatstroke pathogenesis, suggesting new therapeutic avenues.

Area of Science:

  • Immunology
  • Pathophysiology
  • Environmental Medicine

Background:

  • Heatstroke, a critical condition marked by hyperthermia and neurological dysfunction, can lead to severe complications including shock, ARDS, and multiorgan failure.
  • The precise mechanisms underlying metabolic changes and tissue damage in heatstroke are not fully elucidated.
  • Emerging evidence points to the involvement of endotoxins and specific cytokines like TNF-alpha and IL-1 alpha, prompting investigation into other pyrogenic cytokines.

Purpose of the Study:

  • To investigate the role of pyrogenic cytokines, specifically interleukin-6 (IL-6), interleukin-1 beta (IL-1 beta), and interferon gamma (INF-gamma), in the pathogenesis of heatstroke.
  • To assess the correlation between plasma concentrations of these cytokines, C-reactive protein (CRP), and the severity of illness in heatstroke patients.

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Main Methods:

  • A prospective analysis was conducted at the Heatstroke Center in Makkah, Saudi Arabia.
  • Plasma concentrations of IL-6, IL-1 beta, and INF-gamma were measured using enzyme-linked immunosorbent assay in 28 heatstroke patients and 10 healthy controls.
  • C-reactive protein (CRP) levels were measured, and illness severity was assessed using the simplified acute physiology score.

Main Results:

  • Elevated plasma concentrations of IL-6, IL-1 beta, and INF-gamma were observed in heatstroke patients compared to controls.
  • IL-6 levels significantly correlated with the severity of illness (r = 0.516, p = 0.03), with the highest concentrations seen in non-survivors.
  • CRP was elevated in a majority of patients, indicating an acute phase response, but no significant correlation was found between cytokine levels and CRP or body temperature.

Conclusions:

  • The presence of elevated IL-6, IL-1 beta, and INF-gamma, along with an acute phase response, suggests these cytokines are implicated in heatstroke pathogenesis.
  • The correlation between IL-6 levels and illness severity highlights its potential as a prognostic marker.
  • These findings may pave the way for novel therapeutic strategies targeting cytokine pathways in heatstroke management.