Abstract
Objectives
This study aimed to determine trends in the prevalence of chronic opioid users among patients with chronic gout in South Korea from 2002 to 2015 and to investigate the factors associated with chronic opioid use among patients with chronic gout.
Methods
We performed a population-based cohort study and extracted data from the National Health Insurance Service database in South Korea. We included all adult patients (age ≥ 18 years) with a diagnostic code of M1A* (chronic gout) according to the International Classification of Disease (10th revision).
Results
The prevalence of chronic opioid users among patients with chronic gout has gradually increased from 4.0% in 2002 to 19.4% in 2015. After excluding the patients who had a history of cancer or other rheumatic diseases, a total of 18,042 patients with chronic gout were included in this cross-sectional cohort study in 2015, of which 993 (5.5%) were long-term opioid users. In a multivariable model, older age, female sex, Charlson Comorbidity Index > 2, long-term use of other analgesics, such as pregabalin, gabapentin, paracetamol, and glucocorticoids, and the use of other gout medication (colchicine) were independently associated with higher rates of long-term opioid use among patients with chronic gout.
Conclusion
Chronic opioid users among patients with chronic gout increased from 2002 to 2015 in South Korea. Female sex, older age, comorbid status, and the use of other non-opioid analgesics were independently associated with higher rates of long-term opioid use among patients with chronic gout.
Key Points • Chronic opioid users among patients with chronic gout have increased from 2002 to 2015 in South Korea. • Among patients with chronic gout, 5.5% were long-term opioid users. • Female sex, older age, comorbid status, and the use of other non-opioid analgesics were associated with higher rates of long-term opioid use. |
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Data availability
The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.
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TKO and IAS contributed to the study design and methodology, analyzed the data, and drafted the first manuscript. All authors read and approved the final version of the manuscript.
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The study protocol was approved by the Institutional Review Board of Seoul National University Bundang Hospital (no. X-1905-541-902) and the Health Insurance Review and Assessment Service (NHIS-2019-2-160).
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Informed consent was waived because data analyses were performed retrospectively with anonymous data derived from the South Korean National Health Insurance Service (NHIS) database.
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Appendix. ICD-10 codes
Appendix. ICD-10 codes
The ICD-10 codes used by comorbidity to compute the Charlson comorbidity index are as follows:
○ Myocardial infarction: I21.x, I22.x, I25.2
○ Congestive heart failure: I09.9, I11.0, I13.0, I13.2, I25.5, I42.0, I42.5–I42.9, I43.x, I50.x, P29.0
○ Peripheral vascular disease: I70.x, I71.x, I73.1, I73.8, I73.9, I77.1, I79.0, I79.2, K55.1, K55.8, K55.9, Z95.8, Z95.9
○ Cerebrovascular disease: G45.x, G46.x, H34.0, I60.x–I69.x
○ Dementia: F00.x–F03.x, F05.1, G30.x, G31.1
○ Chronic pulmonary disease: I27.8, I27.9, J40.x–J47.x, J60.x–J67.x, J68.4, J70.1, J70.3
○ Rheumatic disease: M05.x, M06.x, M31.5, M32.x–M34.x, M35.1, M35.3, M36.0
○ Peptic ulcer disease: K25.x–K28.x
○ Mild liver disease: B18.x, K70.0–K70.3, K70.9, K71.3–K71.5, K71.7, K73.x, K74.x, K76.0, K76.2–K76.4, K76.8, K76.9, Z94.4
○ Diabetes without chronic complication: E10.0, E10.1, E10.6, E10.8, E10.9, E11.0, E11.1, E11.6, E11.8, E11.9, E12.0, E12.1, E12.6, E12.8, E12.9, E13.0, E13.1, E13.6, E13.8, E13.9, E14.0, E14.1, E14.6, E14.8, E14.9
○ Diabetes with chronic complication: E10.2–E10.5, E10.7, E11.2–E11.5, E11.7, E12.2–E12.5, E12.7, E13.2–E13.5, E13.7, E14.2–E14.5, E14.7
○ Hemiplegia or paraplegia: G04.1, G11.4, G80.1, G80.2, G81.x, G82.x, G83.0–G83.4, G83.9
○ Renal disease: I12.0, I13.1, N03.2–N03.7, N05.2–N05.7, N18.x, N19.x, N25.0, Z49.0–Z49.2, Z94.0, Z99.2
○ Any malignancy, including lymphoma and leukemia, except malignant neoplasm of skin: C00.x–C26.x, C30.x–C34.x, C37.x–C41.x, C43.x, C45.x–C58.x, C60.x–C76.x, C81.x–C85.x, C88.x, C90.x–C97.x
○ Moderate or severe liver disease: I85.0, I85.9, I86.4, I98.2, K70.4, K71.1, K72.1, K72.9, K76.5, K76.6, K76.7
○ Metastatic solid tumor: C77.x–C80.x
○ AIDS/HIV: B20.x–B22.x, B24.x
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Oh, T.K., Song, IA. Long-term opioid use among patients with chronic gout: a cross-sectional study of a sample cohort in South Korea. Clin Rheumatol 39, 3033–3039 (2020). https://doi.org/10.1007/s10067-020-05085-5
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DOI: https://doi.org/10.1007/s10067-020-05085-5