The COVID-19 pandemic continues to test health systems resilience worldwide. Low- and middle-income country (LMIC) health care systems have considerable experience in disasters and disease outbreaks. Lessons from the preparedness and responses to COVID-19 in LMICs may be valuable to other countries.This policy paper synthesises findings from a multiphase qualitative research project, conducted during the pandemic to document experiences of Pacific Island Country and Territory (PICT) frontline clinicians and emergency care (EC) stakeholders. Thematic analysis and synthesis of enablers related to each of the Pacific EC systems building blocks identified key factors contributing to strengthened EC systems.Effective health system responses to the COVID-19 pandemic occurred when frontline clinicians and 'decision makers' collaborated with respect and open communication, overcoming healthcare workers' fear and discontent. PICT EC clinicians demonstrated natural leadership and strengthened local EC systems, supporting essential healthcare. Despite resource limitations, PICT cultural strengths of relational connection and innovation ensured health system resilience. COVID-19 significantly disrupted services, with long-tail impacts on non-communicable disease and other health burdens.Lessons learned in responding to COVID-19 can be applied to ongoing health system strengthening initiatives. Optimal systems improvement and sustainability requires EC leaders' involvement in current decision-making as well as future planning.

Search strategy and selection criteria: Search strategy and selection criteria We searched PubMed, Google Scholar, Ovid, WHO resources, Pacific and grey literature using search terms 'emergency care', 'acute/critical care', 'health care workers', 'emergency care systems/health systems', 'health system building blocks', 'COVID-19', 'pandemic/surge event/disease outbreaks' 'Low- and Middle-Income Countries', 'Pacific Islands/region' and related terms. Only English-language articles were included.

Funding: Phases 1 and 2A of this study were part of an Epidemic Ethics/World Health Organization (WHO) initiative, supported by Foreign, Commonwealth and Development Office/Wellcome Grant 214711/Z/18/Z. Copyright of the original work on which this publication is based belongs to WHO. The authors have been given permission to publish this manuscript. The authors alone are responsible for the views expressed in this publication and they do not necessarily represent the views, decisions or policies of WHO. Co-funding for this research was received from the Australasian College for Emergency Medicine Foundation via an International Development Fund Grant. RM is supported by a National Health and Medical Research Council (NHMRC) Postgraduate Scholarship and a Monash Graduate Excellence Scholarship. GOR is supported by a NHMRC Early Career Research Fellowship. CEB is supported by a University of Queensland Development Research Fellowship. None of these funders played any role in study design, results analysis or manuscript preparation.