Publications by authors named "Yisak Kim"

Background: Immunoglobulin A nephropathy (IgAN) is a major cause of end-stage kidney disease (ESKD). The International IgA Nephropathy Prediction Tool (IIgAN-PT) predicts IgAN prognosis, but improvement in the prediction performance using machine learning (ML)-based methods is needed.

Methods: We analyzed 4,425 biopsy-confirmed patients with IgAN and ≥6 months of follow-up from nine tertiary university hospitals in Korea.

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Article Synopsis
  • Lung ultrasound (LUS) is increasingly used for respiratory evaluations, but operator skills limit its effectiveness.
  • Researchers created a deep-learning model to enhance the classification of LUS findings (normal, B-line, consolidation, effusion) and validated it using thousands of images from a clinical database.
  • The model showed strong performance, improving diagnostic accuracy and agreement among radiologists, suggesting it can help overcome the skill limitations of operators in interpreting LUS.
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Background: Artificial intelligence has been increasingly used in medical imaging and has demonstrated expert level performance in image classification tasks.

Objective: To develop a fully automatic approach for determining the Risser stage using deep learning on abdominal radiographs.

Materials And Methods: In this multicenter study, 1,681 supine abdominal radiographs (age range, 9-18 years, 50% female) obtained between January 2019 and April 2022 were collected retrospectively from three medical institutions and graded manually using the United States Risser staging system.

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  • A study aimed to create a deep learning model to predict the risk of subsequent fractures in patients who recently experienced a hip fracture, by using digitally reconstructed radiographs from hip CT scans.
  • The research analyzed data from 1,012 patients for model development and validated it on another 468 patients, finding that the ensemble model significantly outperformed other existing prediction models in terms of accuracy over 2, 3, and 5 years.
  • Results indicated that the new model had higher probabilities of predicting fractures compared to both image-based models and a clinical model that considered established risk factors, showcasing its potential for improving patient care.
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Chest radiography is an essential tool for diagnosing community-acquired pneumonia (CAP), but it has an uncertain prognostic role in the care of patients with CAP. The purpose of this study was to develop a deep learning (DL) model to predict 30-day mortality from diagnosis among patients with CAP by use of chest radiographs to validate the performance model in patients from different time periods and institutions. In this retrospective study, a DL model was developed from data on 7105 patients from one institution from March 2013 to December 2019 (3:1:1 allocation to training, validation, and internal test sets) to predict the risk of all-cause mortality within 30 days after CAP diagnosis by use of patients' initial chest radiographs.

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Unlabelled: The need for an accurate country-specific real-world-based fracture prediction model is increasing. Thus, we developed scoring systems for osteoporotic fractures from hospital-based cohorts and validated them in an independent cohort in Korea. The model includes history of fracture, age, lumbar spine and total hip T-score, and cardiovascular disease.

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Objective: This review will focus on how AI-and, specifically, deep learning-can be applied to complement aspects of the current healthcare system. We describe how AI-based tools can augment existing clinical workflows by discussing the applications of AI to worklist prioritization and patient triage, the performance-boosting effects of AI as a second reader, and the use of AI to facilitate complex quantifications. We also introduce prominent examples of recent AI applications, such as tuberculosis screening in resource-constrained environments, the detection of lung cancer with screening CT, and the diagnosis of COVID-19.

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The orphan nuclear receptor ESRRA (estrogen-related receptor α) is a key regulator of energy homeostasis and mitochondrial function. Macroautophagy/autophagy, an intracellular degradation process, is a critical innate effector against intracellular microbes. Here, we demonstrate that ESRRA is required for the activation of autophagy to promote innate antimicrobial defense against mycobacterial infection.

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