• Saber Yezli, Yara Yassin, Sujoud Ghallab, Mashan Abdullah, Bisher Abuyassin, Ramesh Vishwakarma, and Abderrezak Bouchama.
• Biostatistics, Epidemiology and Scientific Computing Department, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.
• J. Intern. Med. 2023 Jul 1; 294 (1): 7207-20.

BackgroundAlthough classic heat stroke (HS) is one of the most ancient conditions known to humans, the description of its early clinical manifestations, natural course, and complications remains uncertain.ObjectivesA systematic review of the demographics, clinical characteristics, biomarkers, therapy, and outcomes of HS during the Muslim (Hajj) pilgrimage in the desert climate of Mecca, Saudi Arabia.MethodsWe searched the MEDLINE, Embase, Web of Science Core Collection, SCOPUS, and CINAHL databases from inception to April 2022. We summarized the data from eligible studies and synthesized them in narrative form using pooled descriptive statistics.ResultsForty-four studies, including 2632 patients with HS, met the inclusion criteria. Overweight or obesity, diabetes, and cardiovascular disease were prevalent among cases of HS. Evidence suggests that extreme hyperthermia (pooled mean = 42.0°C [95% confidence interval (CI): 41.9, 42.1], range 40-44.8°C) with hot and dry skin (>99% of cases) and severe loss of consciousness (mean Glasgow Coma Scale <8 in 53.8% of cases) were the dominant clinical characteristics of classic HS. Hypotension, tachypnea, vomiting, diarrhea, and biochemical biomarkers indicating mild-to-moderate rhabdomyolysis, acute kidney, liver, heart injury, and coagulopathy were frequent at the onset. Concomitantly, stress hormones (cortisol and catecholamines) and biomarkers of systemic inflammation and coagulation activation were increased. HS was fatal in 1 in 18 cases (pooled case fatality rate = 5.6% [95%CI: 4.6, 6.5]).ConclusionsThe findings of this review suggest that HS induces an early multiorgan injury that can progress rapidly to organ failure, culminating in death, if it is not recognized and treated promptly.© 2023 The Association for the Publication of the Journal of Internal Medicine.

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