Suicidal ideation after acute traumatic brain injury: A longitudinal actor-partner interdependence model of patients and caregivers in Latin America.

The study used a single PHQ-9 item, so it captured thoughts of death or self-harm but not intent, plans, past attempts, or warning signs. The study did not measure injury severity or disability, and the authors note there is no standardized procedure for measuring severity in Latin America. Pre-existing psychiatric history was not controlled, even though it could influence caregiver suicidal ideation. The sample was relatively small and did not allow testing moderators such as gender or relationship type. Site and country differences were not evaluated, and the hospitals were urban sites in Mexico and Colombia, so rural areas and other Spanish-speaking regions may differ. The authors did not track how many patients were approached, so refusals and ineligibility are unknown. Follow-up ended at 4 months, so longer-term ideation and dyadic relationships are unknown. Patients and caregivers at these hospitals did not routinely receive cognitive or psychiatric outpatient rehabilitation, which may affect generalizability. Some dyads were lost at follow-up, and a few participants had incomplete ideation item data.

The authors state they have no additional conflicts of interest to disclose.

Do not read the patient-to-caregiver association as proof that patient suicidal ideation caused caregiver suicidal ideation. The study was observational, used a single ideation item, and the authors say unaccounted variables could influence the relationship.