Emergency department length of stay and re-presentation rates in patients with low back pain: A medical record review study

Background: Low back pain (LBP) is ranked in the top 10 conditions presenting to emergency departments (ED) in Australia. We aimed to investigate ED re-presentation rates and length of stay (LOS) of patients with LBP, including associated factors. Methods: We reviewed medical records of three EDs in Sydney, Australia from January 2016 to October 2021. The primary outcome was the proportion of episodes of non-serious LBP with at least one re-presentation within 12 months. Secondary outcomes were re-presentation rates within 3-days, 1-week, 1-month, 3-months, 6-months, and mean LOS. Multivariable logistic regression analyses were performed to investigate the associated factors with re-presentation and prolonged stay (>4 h) and reported as adjusted odds ratios (aORs) and 95% confidence intervals (95% CI). Results: Of 8289 episodes of non-serious LBP, 7.7% included at least one re-presentation within 12 months. There were only 14 re-presentations (0.2%) where the diagnosis changed from non-serious LBP at the index visit to serious spinal pathology at the repeat visit. The overall mean LOS was 4.1 h, and 26.9% of patients stayed in the ED for >4 h. Those who received opioids (aOR: 1.31; 95% CI: 1.08-1.59) were more likely to re-present. In contrast, patients receiving imaging were less likely to re-present (aOR: 0.78, 95% CI: 0.65-0.94). Receiving imaging (aOR: 2.83; 95% CI: 2.56-3.13) and opioids (aOR: 1.64; 95% CI: 1.47-1.82) increased the odds of prolonged stay. Conclusion: A re-presentation within 12 months occurs in 7.7% of episodes of LBP in ED. Over one-quarter of patients stayed longer than 4 h. (c) 2024 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).