Safety of early discharge after elective lumbar spine surgery with subfascial drains and association with significant reduction in length of stay

Objective: After lumbar spine surgery, postoperative drain removal often delays discharge. Whether inpatient drain removal reduces the risk of surgical site infection (SSI) or hematoma remains controversial. Therefore, in patients undergoing elective lumbar spine surgery, the authors sought to determine the impact of inpatient versus outpatient drain removal on the following variables: 1) length of hospital stay (LOS), and 2) postoperative complications.

Methods: A single-center retrospective cohort study in which the authors used prospectively collected data of patients undergoing primary, elective, 1- or 2-level lumbar spine decompression and/or fusion was undertaken between 2016 and 2022. Patients with intraoperative or postoperative CSF leaks were excluded. The primary exposure variable was inpatient versus outpatient drain removal. The primary outcome was LOS, and secondary outcomes were postoperative complications, including 90-day postoperative SSI or hematoma. Multivariable logistic and linear regression were performed, controlling for age, body mass index, instrumentation, number of levels, antibiotics at discharge, and surgeons involved.

Results: Of 483 patients included, 325 (67.3%) had inpatient drain removal and 158 (32.7%) had outpatient drain removal. Patients with outpatient drain removal were significantly younger (58.6 ± 12.4 vs 61.2 ± 13.2 years, p = 0.040); more likely to have 1-level surgery (75.9% vs 56.6%, p < 0.001); and less likely to receive instrumentation (50.6% vs 69.5%, p < 0.001). Postoperatively, patients with outpatient drain removal had a shorter LOS (0.7 ± 0.6 vs 2.3 ± 1.6 days, p < 0.001); were more likely to be discharged home (98.1% vs 92.3%, p = 0.015); were more likely to be discharged on antibiotics (76.6% vs 3.1%, p < 0.001); were less likely to be on opioids (32.3% vs 88.3%, p < 0.001); and were more likely to have Jackson-Pratt compared to Hemovac drains (96.2% vs 34.5%, p < 0.001). No difference was found in SSI (3.7% vs 3.8%, p > 0.999) or hematoma (0.9% vs 0.6%, p > 0.999), as well as reoperation or readmission due to SSI or hematoma. On multivariable regression, outpatient drain removal was significantly associated with shorter LOS (β = -1.15, 95% CI -1.56 to -0.73, p < 0.001). No association was found with SSI/hematoma (p > 0.05).

Conclusions: Outpatient drain removal after elective lumbar spine surgery was associated with a significantly decreased LOS without a significant increase in postoperative SSI or hematoma. Although the choice of drain removal and the LOS may be subject to surgeons' preference, these results may support the feasibility and safety of outpatient drain removal, and the potential cost savings resulting from shortened hospital stays. Drawbacks may exist regarding added burden to the patient and the surgeon's team to accommodate 1-week follow-up appointments for drain removal.