Fatal heat injury incident in a private home for elderly people: a case report

This report presents a case in which an 84-year-old elderly female resident of a private home for the aged was fatally injured by a young male member of staff. The deceased suffered from senile dementia, and died from heat shock due to prolonged exposure to an electric fan heater. The heater had been placed immediately in front of the woman's body for approximately 2.5 hours, and the deceased could not escape from the heat by herself. Major autopsy findings were marked second degree burns (predominantly) and smaller areas of first degree burns observed on the anterior body surface (chiefly the face, lower abdomen, forearm and thigh). The burns area exceeded one-third of the entire body surface. Only a small amount of dark red blood (36g) remained in the heart cavity: this was fluid but remarkably condensed. Petechial bleeding was observed in areas such as the palpebral conjunctivae and renal pelvic mucosae. This case generated great public attention as the assailant, who had been employed exclusively for three nights' duty per week, had been regarded as very diligent and kind; inflicting such a lethal injury appeared out of character. Several important issues related to managing residential care facilities for the elderly (in particular, the stress associated with night duty caring for the aged with senile dementia, and the mental health care of the staff themselves) were disclosed and are discussed herein from a medico-legal viewpoint.