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Renal failure and heatstroke

A Y Wang¹, P K Li, S F Lui

¹Department of Medicine, Chinese University of Hong Kong, Prince of Wales Hospital Shatin.

|March 1, 1995

Summary

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Exertional heatstroke can cause severe multi-organ failure, particularly affecting the kidneys through rhabdomyolysis. Prompt treatment like alkaline diuresis is often effective for heatstroke-induced renal impairment.

Area of Science:

Nephrology
Sports Medicine
Critical Care Medicine

Background:

Exertional heatstroke is a medical emergency with potentially fatal outcomes.
Obesity may be a risk factor for severe heatstroke complications.
Renal impairment is a common complication of heatstroke.

Observation:

A fatal case of heatstroke in an obese boy with multi-organ failure was reported.
Six other exertional heatstroke cases over five years were reviewed.
All patients exhibited some degree of renal impairment, primarily due to rhabdomyolysis.

Findings:

Rhabdomyolysis was identified as the major cause of renal failure in heatstroke patients.
Most cases responded to alkaline diuresis; continuous venovenous hemofiltration was useful for unstable patients.

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Hypokalemia or normokalemia, rather than hyperkalemia, was associated with rhabdomyolysis.

Mortality correlated with prolonged hyperthermia, coma, disseminated intravascular coagulation, cardiogenic shock, and acidosis.

Implications:

Early recognition and management of heatstroke are crucial for preventing severe complications like multi-organ failure.
Alkaline diuresis is a primary treatment for heatstroke-related renal dysfunction.
Understanding the specific electrolyte imbalances associated with rhabdomyolysis in heatstroke is important for patient care.