Indicators of poor prognosis during acute episodes include the following:
Initial temperature measurement > 106°F (> 41°C), a temperature > 108°F (> 42°C), or a temperature persisting > 102°F (> 39°C) despite aggressive cooling measures
Coma duration > 2 hours
Severe pulmonary edema
Delayed or prolonged hypotension
Lactic acidosis in patients with classic heat stroke
Acute kidney injury and hyperkalemia
Aminotransferase levels > 1000 IU/L during the first 24 hours
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Cite this: Richard H. Sinert. Fast Five Quiz: Summer Health Concerns - Medscape - Jun 06, 2019.