Provincial dissemination of HEARTSMAP, an emergency department psychosocial assessment and disposition decision tool for children and youth.

Our approach reached and effectively trained clinicians from over half of the province's EDs to use HEARTSMAP for emergency paediatric psychosocial assessments. For some, this provided greater comfort and confidence for these assessments and the following disposition decisions. This evaluation provides valuable insights on training clinicians to use a paediatric mental health tool within diverse ED settings and emphasized the need for ongoing support and institutional engagement to facilitate local, infrastructural, and operational processes for adoption and maintenance, postdissemination.