J Korean Med Sci.  2021 May;36(19):e127. 10.3346/jkms.2021.36.e127.

Effect of Opioids on All-cause Mortality and Sustained Opioid Use in Elderly Patients with Hip Fracture: a Korea Nationwide Cohort Study

• Yoo JI
• Jang SY
• Cha Y
• Park CH
• Kim JT
• Oh S
• Choy W

• KMID: 2515862
• DOI: http://doi.org/10.3346/jkms.2021.36.e127

Abstract

Background
The purpose of our study was to assess the use of opioids before and after hip fracture in elderly patients in order to determine the effect of opioid use on all-cause mortality, and to analyze how the history of opioid use before fracture increases the risk of sustained use following hip fracture using a Korea nationwide cohort.
Methods
Our study identified hip fracture patients from the Korean National Health Insurance Service-Senior cohort. The index date was defined as 90-days after admission to the acute care hospital that fulfilled the eligibility criteria of elderly hip fracture. Patients were classified into past user, current user, and sustained user according to the use of opioid at each period based on the time of admission and index date. The opioids were classified into strong opioids and tramadol. A generalized estimating equation model with a Poisson distribution and logarithmic link function was performed to estimate the adjusted rate ratios (aRRs) and 95% confidence intervals (CIs) to assess the association between past use and sustained use. A multivariable-adjusted Cox proportional hazard model was used to investigate the effects of strong opioid and tramadol use on all-cause mortality.
Results
A total of 12,927 patients were included in our study. There were 7,384 (57.12%) opioid past-users, 11,467 (88.71%) opioid current-users, and 7,172 (55.48%) sustained users. In comparison of the death risk according to current use or the defined daily dose of the opioids or past opioid use, there were no significant differences in the adjusted hazard ratio for death in all groups, compared to the current non-users (P > 0.05). Among survivors 1 year after hip fracture, opioid past-use increased the risk of opioid sustained use by 1.52-fold (aRR; 95% CI, 1.45–1.8; P < 0.001).
Conclusion
Current use and past use of opioid did not increase all-cause mortality after hip fracture in elderly patients over 65 years of age. Past use of opioid before hip fracture increased risk of sustained use of opioid compared to the current opioid used without past use.

Keyword

Opioid; Mortality; Addiction; Elderly; Hip Fracture; Nationwide Cohort Study

Figure

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  Fig. 1 Flowchart for the selection of the study subjects.NHIS-Senior = Korean National Health Insurance Service-Senior cohort.

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  Fig. 2 Trends in the percentage of opioid users before and after fracture in older patients with hip fractures.

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