Emergency Department Visits Prior to Suicide and Homicide: Linking Statewide Surveillance Systems.

Background: Emergency departments (EDs) serve a wide range of patients who present at risk of impending suicide and homicide.
Aims: Two statewide surveillance systems were probabilistically linked to understand who utilizes EDs and then dies violently within 6 weeks.
Method: Each identified case was matched with four randomly selected controls on sex, race, date of birth, resident zip code, and date of ED visit vs. date of death. Matched-pair odds ratios were estimated by conditional logistic regression to assess differences between cases and controls on reported diagnoses and expected payment sources.
Results: Of 1,599 suicides and 569 homicides in the 3-year study period, 10.7% of decedents who died by suicide (mean = 13.6 days) and 8.3% who died by homicide (mean = 16.3 days) were seen in a state ED within 6 weeks prior to death. ED attendees who died by suicide were more likely to have a diagnosis of injury/ poisoning diagnosis or mental disorder and more likely to have Medicare. Those who died by homicide were more likely to have a diagnosis of injury/poisoning and less likely to have commercial insurance.
Conclusion: It is essential for research to further explore risk factors for imminent suicide and homicide in ED patients who present for psychiatric conditions and general injuries.