Abstract
Data supporting the benefits of early surgical intervention in acute spinal cord injury (SCI) is growing. For early surgery to be accomplished, understanding the causes of variabilities that effect the timing of surgery is needed to achieve this goal. The purpose of this analysis is to determine factors that affect the timing of surgery for acute cervical SCI within the North American Clinical Trials Network (NACTN) for SCI registry. Patients in the NACTN SCI registry from 2005 to 2019 with a cervical SCI, excluding Acute Traumatic Central Cord Syndrome, were analyzed for time elapsed from injury to arrival to the hospital, and time to surgery. Two categories were defined: 1) Early Arrival with Early Surgery commenced within 24 hours of injury (EAES) and 2) Early Arrival but Delayed Surgery (EADS) with surgery occurring between 24 to 72 hours post-injury. Patients' demographic features, initial clinical evaluation, medical comorbidities, neurological status, surgical intervention, complications, and outcome data were correlated with respect to the two arrival groups. Of the 222 acute cervical SCI patients undergoing surgery, 163 (73.4%) were EAES, and 59 (26.6%) were EADS. There was no statistical difference in arrival time between the EAES and EADS groups. There was a statistical difference in the median arrival time to surgery between the EAES group (9 hours) compared to the EADS group (31 hours) (p<0.05). There was no statistical difference in race, sex, age, mechanism of injury, APACHE II scores, or medical comorbidities between the two groups but the EAES group did present with a significantly lower systolic blood pressure (p<0.05). EADS patients were more likely to present as an AIS D than EAES (p<0.05). Early surgery was statistically more likely to occur if the injury occurred over the weekend (p<0.05). There were variations in the rates of early surgery between the 8 NACTN sites within the study, ranging from 57% to 100%. Of the 114 patients with 6-month outcome data, there was no significant change between the two groups regarding AIS grade change and motor/pin prick/light touch score recovery. A trend towards improved motor scores with early surgery was not statistically significant (p=0.21). Although there is data that surgery within 24 hours of injury improves outcomes and can be performed safely, there remain variations in care outside of clinical trials. In the present study of cervical SCI, NACTN achieved its goal of early surgery in 73.4% of patients from 2005-2019 who arrived within 24 hours of their injury. Variability in achieving this goal was related to severity of neurological injury, the day of the week, and the treating NACTN center. Evaluating variations within our network improves understanding of potential systemic limitations and our decision-making process to accomplish the goal of early surgery.