Heat Hyperpyrexia (Heat Stroke)
Forensic Medicine: Environmental Fatalities
1. Clinical Definition
Heat stroke is a medical emergency characterized by a body temperature usually exceeding 40.5°C (105°F), combined with central nervous system dysfunction (delirium, seizures, or coma) and often an absence of sweating (anhidrosis).
2. Forensic Pathological Findings
| System | Autopsy Findings |
|---|---|
| Brain | Cerebral edema, petechial hemorrhages (especially in the basal ganglia/cerebellum). |
| Lungs | Pulmonary congestion and edema. |
| General | Rapid onset of rigor mortis, skin discoloration (cyanosis or purpura), and internal hemorrhages. |
3. High-Yield Forensic Pearls
- Diagnostic Threshold: Heat stroke is a diagnosis of exclusion. Forensic investigators must rule out other causes of hyperpyrexia (e.g., meningitis, malignant hyperthermia, drug-induced serotonin syndrome).
- Circumstantial Evidence: The scene investigation is critical. Document the ambient temperature, humidity, ventilation, and whether the victim had access to water or cooling mechanisms.
- Multi-Organ Failure: Death occurs due to disseminated intravascular coagulation (DIC), rhabdomyolysis leading to acute renal failure, and profound shock.
- Rigor Mortis: Note that rigor mortis in heat stroke deaths occurs *very rapidly* due to the high temperature, which may lead to incorrect estimations of the Time Since Death (TSD).