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by Lisa R. Leon (Author)
Heat illnesses exist along a continuum starting with the mild condition of heat exhaustion and progressing to heat injury and heat stroke. Heat stroke is a life-threatening condition clinically characterized by a severe elevation in body temperature with central nervous system dysfunction that often includes combativeness, delirium, seizures, and coma. Classic heat stroke is experienced primarily by the very young or elderly during annual heat waves. Exertional heat stroke is a condition experienced by young, fit individuals during strenuous physical activity in hot or temperate environments. Heat stroke sequelae are a consequence of heat injury to the tissues in combination with coagulopathies and a systemic inflammatory response syndrome (SIRS) that often culminates in multi-organ system dysfunction or death. Endotoxin leakage across ischemic-damaged gut membranes is thought to initiate the SIRS with cytokines and other inflammatory mediators involved in this multi-factorial process. Rapid cooling at the time of heat stroke collapse is the most effective treatment to limit the severity of organ injury, but does not prevent long-term sequelae in all individuals. Unfortunately, there is limited understanding of the mechanisms mediating downstream effects of the SIRS on multi-organ injury and there are no clinical treatments to ensure recovery. Rather, many heat stroke victims experience permanent neurological dysfunction and peripheral organ injury that require months or years to resolve. Current research efforts are focused on identifying better diagnostic and prognostic biomarkers of organ injury for development of more effective pharmacologic strategies to improve recovery.
Author Biography
Lisa R. Leon, Ph.D., received a B.A. degree (1985) in Anthropology-Zoology, an M.S. in Kinesiology (1990), and a Ph.D. (1996) in Physiology from the University of Michigan. She completed postdoctoral training at the Lovelace Institutes, the National Institutes of Health, and the University of Delaware before accepting a Research Physiologist position at the U.S. Army Research Institute of Environmental Medicine (USARIEM) in 2001. She is currently Team Leader of the Environmental Pathophysiology research program at USARIEM and also serves as Adjunct Associate Professor in the Human Physiology Program at Boston University. She is a member of several editorial boards including the Journal of Applied Physiology and the American Journal of Physiology. Her research is focused on unraveling the mechanisms that mediate systemic inflammation to heat stroke with the goal of discovering novel biomarkers and pharmacologics to improve diagnosis and treatment of multi-organ system dysfunction.
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