Background: Treatment for idiopathic pulmonary fibrosis (IPF) has changed over the past decades. Understanding the actual status of IPF treatment and evaluating the consistency of the guidelines are important for improving the treatment strategy. However, the relevant information is insufficient in Japan. Therefore, this study investigated the treatment status and changes in the treatment of patients with IPF in Japan.
Methods: This retrospective claims-based study used a Japanese claims database that included data from acute care hospitals (April 2008-March 2019). Patients with at least one record of definitive IPF diagnosis were classified as patients with IPF. We determined the percentage of patients who received each treatment type by the year.
Results: We analyzed 9961 patients with IPF. The mean (standard deviation) age at first diagnosis was 74.4 (9.3) years, and 74.9% of the patients were men. The number of patients who did not take any drug treatment tended to decrease over the years. Nevertheless, approximately 30% of the patients did not take any drug treatment in recent years. The number of patients who received antifibrotic drugs increased over time, and it became the most popular treatment for ≥40% of the patients in and after 2017. Although steroid prescriptions tended to decrease over time, they were still administered to one-third of the patients with IPF who received drug treatment in and after 2017.
Conclusions: Our findings suggest that changes in the IPF treatment reflect changes in guideline recommendations as well as the availability of treatment in clinical settings in Japan.
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