Background: Drowning deaths due to motor vehicle submersion have been overlooked in current statistics worldwide. To establish effective preventive measures against vehicle submersion, we identified all motor vehicle passenger fatalities due to motor vehicle submersion in a specific area and classified the cause and manner of death. Furthermore, we propose collecting data on all victims of motor vehicle submersion and establishing a comprehensive database or statistics to guide the development of preventive measures.
Methods: Among all motor vehicle-related deaths that occurred in Shiga Prefecture between January 2013 and December 2019, we selected cases of vehicles that were immersed in water and involved the death of passengers. Using the results of police investigations and forensic autopsies, the cause of the event and the cause and manner of death were determined.
Results: Sixteen victims comprising 13 men and three women with a mean age of 52.6 ± 22.3 years were selected for analysis. For the nine victims who died from drowning following operation errors or land motor vehicle collisions, the manner of death was determined as a“ traffic accident”. These deaths accounted for 5.3% of fatal motor vehicle collisions and 1.2% of all unintentional drownings in this area. The remaining three victims had suffered from severe trauma when entering the water following land motor vehicle collisions and subsequently died of trauma. Therefore, 12 deaths were classified as“ accidental traffic deaths”. Because two of the remaining victims had suffered from ischemic heart disease and their vehicles had plunged into the water, the manner of death was classified as“ disease”. Given that the last two victims intentionally ran their vehicles into the water and subsequently died of drowning, the manner of death was determined as“ suicide”.
Conclusions: Because traditional drowning prevention strategies may not be effective in motor vehiclerelated drownings, specific coding or supplemental information specific to drowning is required. To prevent drowning fatalities due to vehicle immersion, promoting education, improving the conditions of hot spots, and developing vehicle safety systems based on further detailed surveys are required.
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