Heat stroke definition
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Heat Stroke Definition and Core Body Temperature Criteria
Heat stroke is a life-threatening medical emergency defined by a severe elevation in core body temperature, typically above 40°C (104°F) or even 40.5–40.6°C (105–105.1°F) Yeo2004Peiris2017Yaqub1998+5 MORE. This extreme hyperthermia overwhelms the body’s ability to regulate temperature, leading to rapid and dangerous increases in body heat .
Central Nervous System Dysfunction in Heat Stroke
A key feature of heat stroke is central nervous system (CNS) dysfunction. This can include confusion, delirium, seizures, loss of consciousness, ataxia, or even coma Yeo2004Peiris2017Yaqub1998+4 MORE. These neurological symptoms are essential for diagnosis and often appear alongside the elevated body temperature.
Types of Heat Stroke: Classic and Exertional
There are two main types of heat stroke:
- Classic heat stroke occurs in vulnerable populations such as the very young, elderly, or those with chronic illnesses, often during heat waves or exposure to hot environments Yeo2004Peiris2017Yaqub1998+1 MORE.
- Exertional heat stroke affects healthy, active individuals (like athletes or military personnel) during strenuous activity in hot conditions Yeo2004Peiris2017Yaqub1998+3 MORE.
Additional Clinical Manifestations and Complications
Other common symptoms include hot, dry skin (or sometimes heavy sweating), extreme fatigue, nausea, vomiting, diarrhea, dizziness, uncoordinated movements, and a reddened face Yeo2004Yaqub1998. If not treated quickly, heat stroke can cause multi-organ failure, including acute kidney injury, liver failure, cardiovascular collapse, and disseminated intravascular coagulation (DIC) Yeo2004Leon2015Herpertz2022. Long-term neurological damage or death can occur if treatment is delayed Yeo20045.
Pathophysiology and Risk Factors
Heat stroke results from a failure of the body’s thermoregulatory system, leading to tissue and organ damage through direct heat injury and a systemic inflammatory response Leon2015Epstein2011Herpertz2022. Risk factors include environmental heat, high humidity, strenuous activity, certain medications, chronic diseases, and lack of acclimatization Leon2015Epstein2011.
Conclusion
In summary, heat stroke is defined by a core body temperature above 40°C (104°F) and central nervous system dysfunction, with rapid progression to multi-organ damage if not treated immediately. Early recognition and prompt cooling are critical to prevent permanent injury or death Yeo2004Peiris2017Yaqub1998+6 MORE.
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