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

BACKGROUND AND OBJECTIVES: Spinal cord infarction (SCInf) is a rare condition where consensus regarding diagnostic criteria is lacking, and misdiagnosis 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 (aged 18 years or older) treated at the spinal cord injury unit of the study center, between 2006 and 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: A total of 270 patients were screened and 57 were included in the study, of whom 30 had a spontaneous SCInf and 27 had a periprocedural SCInf. The median American Spinal Cord Injury Association Impairment Scale (AIS) on admission was C, which at a median follow-up of 2.1 years had improved to D ( p = 0.002). Compared with periprocedural cases, those with 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), and 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 (odds ratio [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 neurologic 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 show that spontaneous SCInf mostly affected a single spinal cord segment, whereas periprocedural cases were more extensive, had poorer AIS on admission, poorer ambulatory function, and longer hospital stays. Regardless of the etiology, significant neurologic improvements were seen at long-term follow-up, highlighting the importance of active rehabilitation.