Fig. 2: Overview of zero-shot NLP pipeline for accurate and interpretable postpartum hemorrhage (PPH) phenotyping.
From: Zero-shot interpretable phenotyping of postpartum hemorrhage using large language models
a Zero-shot extraction of PPH concepts using Flan-T5. We constructed either yes/no or extraction prompts for each PPH concept, concatenated the discharge summary of interest, and fed the combined input into Flan-T5. This process enabled the rapid extraction of PPH-related information from notes with no training data. b We leveraged the extracted concepts to perform interpretable phenotyping of PPH defined as cesarean deliveries with at least 1L or vaginal deliveries with at least 500mL of estimated blood loss. c We used the extracted concepts to perform interpretable subtyping of PPH based on the underlying etiology. We assigned a delivery note to the “tone", “tissue", “trauma", or “thrombin" subtype if any of the concepts associated with the subtype are present. PPH postpartum hemorrhage, EBL estimated blood loss, image: Flaticon.com.
