Long-term Outcomes Following Periprocedural and Spontaneous Spinal Cord Infarctions : A Population-Based Cohort Study

Abstract

BACKGROUND AND OBJECTIVES: Spinal cord infarction (SCInf) is a rare condition where consensus regarding diagnostic criteria is lacking and mis- or delayed diagnosis can be detrimental. The aim of this study was to describe baseline findings and predictors of long-term functional outcome in a population-based cohort of patients with SCInf. METHODS: All adult patients (≥18 years) treated at the Spinal Cord Injury Unit of the study center, between 2006-2019, and discharged with a G95 diagnosis ("other and unspecified disease of the spinal cord") were screened for inclusion. The diagnostic criteria proposed by Zalewski et al. were retrospectively applied to evaluate the certainty of the SCInf diagnosis. RESULTS: 270 patients were screened and 57 were included in the study, of whom 30 had a spontaneous and 27 had a periprocedural SCInf. The median American Spinal Cord Injury Association Impairment Scale (AIS) on admission was C, which at median follow-up of 2.1 years had improved to D (p=0.002). Compared to periprocedural cases, spontaneous SCInf showed significantly better admission-AIS (median AIS D vs. B, p<0.001), fewer multilevel SCInf (27% vs. 59%, p=0.029), shorter hospital stay (median 22 vs. 44 days, p<0.001), as well as better AIS (median AIS D vs. C, p<0.001) and ambulatory status on long-term follow-up (66% vs. 1%, p<0.001). Regression analyses revealed that spontaneous SCInfs (OR=5.91 [1.92-18.1], p=0.002) and more favorable admission-AIS (OR=33.6 [7.72-146], p<0.001) were significant predictors of more favorable AIS at follow-up, with admission-AIS demonstrating independent predictive ability (OR=35.9 [8.05-160], p<0.001). DISCUSSION: SCInf is a rare neurological emergency lacking specific management guidelines. While the presumptive diagnosis is based on the typical presentation and clinical findings, T2-weighted and diffusion-weighted MRI were the most useful diagnostic tools in establishing a definitive diagnosis. Our data shows that spontaneous SCInf mostly affected a single spinal cord segment while periprocedural cases were more extensive, had poorer AIS on admission, poorer ambulatory function, and longer hospital stays. Regardless of the etiology, significant neurological improvements were seen at long-term follow-up, highlighting the importance of active rehabilitation.