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arXiv · 2506.12886

ArgHiTZ at ArchEHR-QA 2025: A Two-Step Divide and Conquer Approach to Patient Question Answering for Top Factuality

Adrián Cuadrón·Aimar Sagasti·Maitane Urruela·Iker De la Iglesia·Ane G Domingo-Aldama·Aitziber Atutxa·Josu Goikoetxea·Ander Barrena
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Abstract

This work presents three different approaches to address the ArchEHR-QA 2025 Shared Task on automated patient question answering. We introduce an end-to-end prompt-based baseline and two two-step methods to divide the task, without utilizing any external knowledge. Both two step approaches first extract essential sentences from the clinical text, by prompt or similarity ranking, and then generate the final answer from these notes. Results indicate that the re-ranker based two-step system performs best, highlighting the importance of selecting the right approach for each subtask. Our best run achieved an overall score of 0.44, ranking 8th out of 30 on the leaderboard, securing the top position in overall factuality.

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Adrián Cuadrón, Aimar Sagasti, Maitane Urruela, Iker De la Iglesia, Ane G Domingo-Aldama, Aitziber Atutxa, Josu Goikoetxea, Ander Barrena. 2025-06-15. ArgHiTZ at ArchEHR-QA 2025: A Two-Step Divide and Conquer Approach to Patient Question Answering for Top Factuality. https://arxiv.org/abs/2506.12886

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