Out-of-hours emergent surgery for degenerative spinal disease in Canada: a retrospective cohort study from a national registry

Abstract

BackgroundSpinal degenerative disease represents a growing burden on our healthcare system, yet little is known about longitudinal trends in access and care. Our goal was to provide an essential portrait of surgical volume trends for degenerative spinal pathologies within Canada. MethodsThe Canadian Institute for Health Information (CIHI) database was used to identify all patients receiving surgery for a degenerative spinal condition from 2006 to 2019. Trends in number of interventions, unscheduled vs. scheduled hospitalizations, in-hours vs. out-of-hours interventions, resource utilization and adverse events were analyzed retrospectively using linear regression models. Confidence intervals were reported in the expected count ratio scale (CR). FindingsA total of 338,629 spinal interventions and 256,360 hospitalizations between 2006-2019 were analyzed. The mean and SD of the annual mean age of patients was 55.5 (SD 1.6) for elective hospitalizations and 55.6 (SD 1.6) for emergent hospitalizations. The proportion of female patients was 47.8% (91,789/192,027) for elective hospitalizations and 41.4% (26,633/64,333) for emergent hospitalizations. Elective hospitalizations increased an average of 2.0% per year, with CR=1.020 (95%CI 1.017 – 1.023, p<0.0001) while emergent hospitalizations exhibited more rapid growth with an average 3.4% annually, with CR 1.034 (95%CI 1.027 – 1.040, p<0.0001). «In-hours» surgeries increased on average 2.7% per year, with CR 1.027 (95%CI 1.021-1.033, p<0.0001), while «out-of-hours» surgeries increased 6.1% annually, with CR 1.061 (95%CI 1.051-1.071, p<0.0001). The resource utilization for unscheduled hospitalizations approximates two and a half times that of scheduled hospitalizations. The proportions of spinal interventions with at least one adverse event increased on average 6.3% per year, with CR 1.063 (95%CI 1.049-1.077, p<0.0001). InterpretationThis study provides novel data critical for all providers and stakeholders. The rapid growth of emergent out-of-hours hospitalizations demonstrates that the needs of this growing patient population have far exceeded health-care resource allocations. Future studies will analyze the health-related quality of life implications of this system shift and identify demographic and socioeconomic inequities in access to surgical care.