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Improving primary healthcare for non-communicable diseases during annual flooding in Bihar, India: study protocol for a hybrid implementation-effectiveness parallel cluster randomised controlled trial

*Corresponding author for this work

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Abstract

Background
Non-communicable diseases (NCDs) cause 4.7 million deaths annually in India. Floods increasingly disrupt NCD care, especially in Bihar, one of India’s most flood-prone and socioeconomically disadvantaged states. This study aims to strengthen the capacity of the community and primary healthcare systems to improve NCD outcomes during annual flooding in Bihar.

Methods
We describe a type II, hybrid implementation-effectiveness parallel cluster randomised controlled trial with an embedded qualitative process evaluation. A multi-component, co-developed intervention targeting primary care and community settings will be implemented and evaluated over two flood seasons in 26 flood-prone community development blocks in three districts of Bihar. Normalisation Process Theory (NPT) will guide the interpretation and adaptation of the intervention for broader applicability. Data will be collected through baseline and follow-up cross-sectional surveys conducted immediately after and 6 months following each annual flood season. Mixed-methods implementation and effectiveness outcomes will be evaluated using the RE-AIM-QuEST (Reach, Effectiveness, Adoption, Implementation, and Maintenance, Qualitative Evaluation for Systematic Translation) framework. Co-primary outcomes are patient medication adherence and availability of a flood-proof kit with medication and clinical handover information during floods. A preliminary health economic evaluation will estimate the cost-effectiveness of the intervention from a healthcare and societal perspective, with and without the use of early-warning flood forecasting.

Conclusion
The FUSION (Floods, UnderStanding clImate change and nON communicable disease) trial will generate evidence on effective and scalable strategies to enhance health system and community resilience for the continuity of NCD care during recurrent flooding in India. Findings will inform public health policy and disaster preparedness efforts in similar resource-constrained, climate-vulnerable settings.

Trial registration
CTRI/2025/07/092055 [Registered on 30/07/2025] http://www.ctri.nic.in/Clinicaltrials/pmaindet2.php?trialid=138142; ISCTRN18019775 [Registered on 12/08/2025] https://www.isrctn.com/ISRCTN18019775.
Original languageEnglish
JournalTrials
DOIs
Publication statusPublished - 31 Mar 2026

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

  1. SDG 3 - Good Health and Well-being
    SDG 3 Good Health and Well-being
  2. SDG 13 - Climate Action
    SDG 13 Climate Action

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