ADHD, Familial Liability, and Absence of Regret: A Clinically Actionable Triad for Identifying Psychobiological Risk in Adolescent Suicide Attempters

Background Suicide attempts during adolescence are common and clinically varied. Although assessments after an attempt often emphasize internalizing disorders, externalizing dysregulation may define a subgroup with different clinical needs. We explored whether neurodevelopmental factors, family psychiatric history, and emotional responses after the crisis could help identify adolescents with a heavier burden of externalizing symptoms following a suicide attempt. Methods This cross-sectional study involved 102 adolescents aged 12–18 years (88.2% female) who were evaluated after a suicide attempt at a university hospital in Türkiye. Psychiatric diagnoses were established using the Kiddie Schedule for Affective Disorders and Schizophrenia—Present and Lifetime Version (K-SADS-PL). Externalizing symptom severity was measured with the parent-rated Turgay DSM-IV Disruptive Behavior Disorders Rating Scale (T-DSM-IV-S). Multiple linear regression was used to examine whether ADHD diagnosis, family psychiatric history, and post-attempt regret were independently related to externalizing severity after controlling for age and sex. Results ADHD was the most common diagnosis (17.6%), followed by major depressive disorder and post-traumatic stress disorder (14.7% each). Nearly half of the sample met the cutoff for at least one disruptive behavior disorder domain, and drug ingestion was the most frequent method of attempted suicide (84.3%). In multivariable regression analyses, ADHD diagnosis, a positive family psychiatric history, and the absence of post-attempt regret were each independently associated with greater externalizing symptom severity, together accounting for about 26% of the variance in total T-DSM-IV-S scores. Age and sex were not significant predictors. Conclusions In this high-risk post-attempt group, readily available clinical markers—ADHD diagnosis, family psychiatric history, and the absence of post-attempt regret—may help identify adolescents with more severe externalizing dysregulation. These findings support a developmentally informed approach to post-attempt assessment that goes beyond internalizing symptoms and also considers family context and trauma-informed care. Prospective studies should examine whether this pattern predicts clinical course, recurrence, and treatment response.