FM2.17-19 | Deaths from Physical Agents & Neglect — Summary & Reflection

KEY TAKEAWAYS

Physical agent deaths span a broad forensic terrain but share a common investigative structure: identify the agent, confirm vital reaction, determine ante-mortem vs post-mortem injury, and frame the medicolegal opinion.

Heat illness: spectrum from heat cramps (salt depletion, no hyperpyrexia) through heat exhaustion (volume depletion, intact consciousness) to heat stroke (core temperature >40°C, CNS dysfunction, anhidrosis, multi-organ failure — identical to sun stroke but from solar exposure). PM: multi-organ failure changes, no pathognomonic single finding.

Cold injury: systemic hypothermia (Wischnewski gastric spots, paradoxical undressing); localised — frostbite (freezing, four degrees), trench foot and immersion foot (non-freezing cold-wet injury).

Burns and scalds: degrees I–IV; vital reaction in ante-mortem burns = hyperaemia + serum-rich blistering + leucocytic infiltration + soot in airways + carboxyhaemoglobin in blood. Post-mortem burns lack all four. Pugilistic attitude is a heat artefact, not a vital reaction. Immersion scald pattern (high-water mark, spared flexures) is characteristic of non-accidental injury in children.

Lightning vs electrocution: Lightning = flashover, Lichtenberg figures (pathognomonic — photograph immediately), clothes blown off, may magnetise metal — almost always accidental. Electrocution = Joule burn (pale centre + red rim) at entry and exit, VF as mechanism — may be accident, homicide, or rarely suicide.

Radiation: acute radiation syndrome (prodromal → latent → manifest illness → recovery/death); haematopoietic failure at 2–6 Gy; AERB mandatory notification.

Starvation and neglect: emaciation, visceral atrophy (reduced organ weights), empty GI tract, brown fat, pressure sores. Distinguish from cancer/TB cachexia. IPC 304A (negligence) or IPC 302 (homicide), Juvenile Justice Act 2015.

REFLECT

Return to the three cases in the hook. For Case 2 (the 7-year-old with burns): the mother says 'accidental boiling water spillage', but the burns are demarcated, with a clear horizontal high-water mark at the wrist, sparing the palm creases. The child has two old healed bruises on the shins. The PM shows second-degree burns with full vital reaction. How does the burn pattern direct your investigation? What additional PM, scene, and social evidence would you seek? How do you document your findings to support a determination of non-accidental injury without overstating what the burns alone can prove? Reflect on your dual role: serving justice while maintaining scientific honesty.