A qualitative study on the vulnerability factors of unintentional injuries among children aged 3-12 in Guizhou Province, China, based on the social-ecological model.

Canada's mental health and substance use burden continues to outpace system capacity, with persistent gaps in timely access to evidence-based psychosocial care across the continuum; from prevention and early intervention to crisis response and post-discharge follow-up (). Digital mental health interventions (–) are increasingly positioned as one lever to expand reach, reduce geographic barriers, and augment constrained workforces (); however, integration into routine care remains uneven due to variability in governance, procurement, privacy requirements, interoperability, and sustainable financing across provinces and territories. Implementation research consistently demonstrates that successful integration of digital mental health interventions depends not only on clinical effectiveness but also on addressing multilevel determinants operating at the policy, organizational, provider, intervention, and user levels (, ). Common barriers include fragmented governance, inadequate funding mechanisms, limited interoperability, clinician readiness, digital literacy, privacy concerns, and challenges sustaining implementation beyond initial adoption (). Frameworks such as the Consolidated Framework for Implementation Research (CFIR) (, ), the Exploration, Preparation, Implementation and Sustainment (EPIS) framework (), and the Reach, Effectiveness, Adoption, Implementation and Maintenance (RE-AIM) framework () have been widely applied to understand and address these implementation challenges across health systems (, ). Within this landscape, short message service (SMS)-based supportive messaging represents a pragmatic, low-barrier modality that can be delivered at population scale without smartphones, data plans, or app installation. SMS-based interventions have demonstrated high acceptability, feasibility, and scalability across a range of health conditions, including chronic disease management, medication adherence, smoking cessation, and mental health. Within mental health and addictions, randomized controlled trials (–) and systematic reviews (–) have shown that supportive text messaging can reduce symptoms of depression, anxiety, stress, alcohol and drug use and psychological distress while improving resilience and patient satisfaction. In addition, emerging economic evaluations indicate that supportive text messaging is highly scalable and can reduce subsequent health service utilization, supporting its potential as a cost-effective adjunct to routine mental health care (). These findings suggest that supportive text messaging has progressed beyond proof-of-concept and represents a mature evidence-informed intervention suitable for broader health system implementation and policy consideration. Nevertheless, systematic reviews report considerable heterogeneity in intervention content, frequency, duration, theoretical underpinning, participant populations, and methodological quality, highlighting the importance of rigorous evaluation and context-specific implementation when scaling these interventions (–). Importantly, supportive messaging can be conceptualized as a “micro-intervention”: brief, frequent prompts that reinforce coping skills (often drawing on cognitive-behavioural and related approaches), normalize distress, and encourage self-management-mechanisms that may be particularly relevant when formal care is delayed or episodic. In parallel, Canada is strengthening crisis response infrastructure through national initiatives such as the 9-8-8: Suicide Crisis Helpline, launched in November 2023, with early implementation described using a public health and implementation framework lens (, ). A key policy question is how to connect crisis services to scalable “care after the call/text,” including brief interventions that can support stabilization, continuity, and linkage to local resources. Evidence from suicide prevention also supports the utility of low-intensity, post-contact outreach approaches (e.g., caring contacts), reinforcing the plausibility of structured, brief follow-up modalities as part of a stepped-care strategy ().