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Home»News»GPT-4 demonstrates high accuracy in parsing multilingual medical notes
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GPT-4 demonstrates high accuracy in parsing multilingual medical notes

healthtostBy healthtostJanuary 6, 2025No Comments6 Mins Read
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Gpt 4 Demonstrates High Accuracy In Parsing Multilingual Medical Notes
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The study evaluates the GPT-4’s ability to process medical notes in English, Spanish and Italian, achieving physician agreement 79% of the time.

Study: The ability of Generative Pre-trained Transformer 4 (GPT-4) to analyze medical notes in three different languages: a retrospective model evaluation study. Image credit: SuPatMaN/Shutterstock.com

In a recent study published in Lancet Digital Healtha group of researchers evaluated the ability of Generative Pre-trained Transformer 4 (GPT-4) to answer predefined questions based on medical notes written in three languages ​​(English, Spanish and Italian).

Background

Medical notes contain valuable clinical knowledge, yet their unstructured narrative form poses challenges for automated analysis.

Large language models (LLMs) such as GPT-4 show promise in extracting explicit details such as medications, but often struggle with implicit understanding of contexts, crucial for nuanced medical decision making. Variability in documentation styles between providers adds to the complexity.

Existing research demonstrates the potential of LLMs for free-text medical data processing, including decoding abbreviations and extracting social determinants of health, however these studies mainly focus on English language notes.

Further research is vital to enhance the ability of LLMs to handle complex tasks, improve contextual reasoning, and assess performance in multiple languages ​​and settings.

About the study

The present retrospective model evaluation study involved eight university hospitals from four countries: the United States of America (USA), Colombia, Singapore, and Italy.

The participating institutions were part of the 4CE Consortium. They included Boston Children’s Hospital, the University of Michigan, the University of Wisconsin, the National University of Singapore, the University of Kansas Medical Center, the University of Pittsburgh Medical Center, the Universidad de Antioquia, and the Istituti Clinici Scientifici Maugeri.

The Department of Biomedical Informatics at Harvard University served as the coordinating center. Each site contributed seven de-identified medical notes written between February 1, 2020 and June 1, 2023, resulting in a total of 56 medical notes, with six sites submitting notes in English, one in Spanish, and one in Italian.

Participating sites selected notes based on proposed criteria, including patients aged 18–65 years with a diagnosis of obesity and coronavirus disease 2019 (COVID-19) at admission. Compliance with these criteria was optional.

Notes submitted included admission, progress and consultation notes, but not discharge summaries. The notes were removed in accordance with the guidelines of the US Health Insurance Portability and Accountability Act, regardless of country of origin.

The study used the GPT-4 API in Python to analyze medical notes through a predefined question-answer framework. Parameters such as temperature, top-p and frequency penalty were adjusted to optimize performance.

Physicians rated the free-text responses and indicated whether they agreed with the GPT-4 responses. They were masked in each other’s ratings but not in the GPT-4 responses.

Statistical analyzes were performed to assess agreement between the GPT-4 and physicians, exploring instances of disagreement and categorizing errors as issues of derivation, inference, or hallucinations.

Subgroup analyzes and sensitivity analyzes addressed variations in accuracy, such as differences in language and specific inclusion criteria.

The study highlighted the ability of GPT-4 to process medical notes in multiple languages, but noted challenges in inference based on context and variability in documentation styles. Data analyzes were performed in RStudio and no external funding supported the study.

Study results

A total of 56 medical records were collected from eight sites in four countries: USA, Colombia, Singapore and Italy. Of these, 42 (75%) notes were in English, seven (13%) in Italian and seven (13%) in Spanish. For each note, the GPT-4 generated responses to 14 predefined questions, resulting in 784 responses.

Among them, both physicians agreed with the GPT-4 in 622 (79%) responses, one physician agreed in 82 (11%) responses, and neither physician agreed in 80 (10%) responses. When the National University of Singapore data were excluded, agreement rates remained similar: 534 (78%) responses had double agreement, 82 (12%) had partial agreement, and 70 (10%) had no agreement.

Physicians were more likely to agree with the GPT-4 for Spanish (86/98, 88%) and Italian (82/98, 84%) notes than for English notes (454/588, 77%).

Note type or length did not affect agreement rates. In cases where only one physician agreed with the GPT-4 (82 responses), 59 (72%) disagreements arose from issues of inference, such as different interpretations of implicit information.

In one case, a physician concluded that a patient did not have COVID-19 based on a “recent infection with COVID-19” note, while the GPT-4 left the condition as undetermined. Extraction problems accounted for 8 (10%) of these disagreements, such as a physician overlooking a documented medical history that identified GPT-4. Differences in level of agreement accounted for the remaining 15 (18%) cases.

In responses where both clinicians disagreed with the GPT-4 (80 responses), inference issues were most frequent (47/80, 59%), followed by inference errors (23/80, 29%) and hallucinations (10/ 80, 13% ).

For example, GPT-4 sometimes failed to link complications such as multisystem inflammatory syndrome as related to COVID-19, a connection made by both doctors. Delusion issues included information about the construction of the GPT-4 that was not in the notes, such as falsely claiming that a patient had COVID-19 when it was not reported.

When evaluating the ability of the GPT-4 to select patients for hypothetical study enrollment based on four inclusion criteria (age, obesity, COVID-19 status, and admission note type), its sensitivity varied. GPT-4 showed high sensitivity for obesity (97%), COVID-19 (96%) and age (94%), but lower specificity for admission notes (22%).

When the acceptance note criterion was excluded, the GPT-4 accurately identified all three remaining criteria 90% of the time.

conclusions

In summary, the study showed that the GPT-4 accurately analyzed medical notes in English, Italian, and Spanish, even without a direct technique.

Surprisingly, it performed better on Italian and Spanish notes than on English, possibly due to the greater complexity of US medical notes, although note length did not affect performance. GPT-4 efficiently extracted explicit information, but its main limitation was extracting implicit details.

This aligns with previous findings that models optimized for medical tasks can overcome such challenges. While the GPT-4 excelled at identifying explicit study inclusion criteria such as age and obesity, it struggled to classify admission notes, likely due to reliance on indirect constructs.

accuracy demonstrates GPT4 high medical multilingual Notes parsing
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