An Analysis of Rheumatoid Arthritis Hospitalizations

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Abstract
We used a large United States (US) population-based database to analyze the reasons for hospitalization of rheumatoid arthritis (RA) patients. The International Classification of Diseases, Tenth Revision (ICD-10) code was used to search for hospitalizations in 2017 in the National Inpatient Sample (NIS) database with RA as the principal or secondary diagnosis. The reasons for hospitalization were divided into 19 categories based on their principal discharge ICD-10 diagnosis code. We also ranked the five most common specific reasons for hospitalization. There were over 35 million discharges included in the 2017 NIS database; 565,440 hospitalizations had either a principal or secondary ICD-10 code for RA. The top five reasons for RA hospitalization by ICD-10 code categories were as follows: cardiovascular (CV): 93,825 (16.59%), rheumatologic: 82,785 (14.64%), respiratory: 66,895 (11.83%), infection: 62,660 (11.09%), and injury/poisoning: 56,460 (9.96%). Sepsis was the most common principal diagnosis for RA hospitalizations. CV diseases were the most common ICD category, and sepsis was the most common principal diagnosis for RA hospitalizations. Management of medical comorbidities (such as CV) and prevention of infection is essential for reducing the rates of RA hospitalizations.

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