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 +3 more
6/15/2025
cs.CL

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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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Cite this paper

@article{cuadrn2025arghitz,
  title  = {ArgHiTZ at ArchEHR-QA 2025: A Two-Step Divide and Conquer Approach to Patient Question Answering for Top Factuality},
  author = {Adrián Cuadrón and Aimar Sagasti and Maitane Urruela and Iker De la Iglesia and Ane G Domingo-Aldama and Aitziber Atutxa and Josu Goikoetxea and Ander Barrena},
  year   = {2025},
  eprint = {2506.12886},
  archivePrefix = {arXiv},
  url    = {http://arxiv.org/abs/2506.12886v1}
}

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