Impact of COVID-19 on neurotrauma cases, mortality rates, and rebound effect: a monocenter retrospective study

Abstract

We retro­spec­tively studied the development of neuro­trauma case numbers during the COVID-19 pandemic in the largest trauma center in Hun­gary and compared them to the data of the previous year. We hypothesized that the decrease in the number of neurotrauma cases during the restrictions would sub­sequently lead to a significant increase in a so-called rebound phenomenon. Our goal was to better understand the effect of the pandemic and the restrictive measures on neurotrauma admissions to help better pre­pare for a new pandemic or for other mobility restrictions. We compiled daily case numbers from January 1, 2019, to April 30, 2021, which included the treatment of 861 patients with spinal trauma and 1244 patients with head injuries from 2019 to 2020, and 871 and 1255 patients with spinal trauma and head injuries, respectively, from March 2020 to April 30, 2021. The parameters studied were patients’ age, admission date and time from injury to admission. We also conducted a minimum 3-month follow-up study with pa­tients admitted during the pandemic to determine the changes in the hazard ratio of mortality. We found that in each wave of the pandemic, during the restrictive measures, neurotrauma case numbers decreased. After the first restrictions, we observed a clinically relevant rebound effect among spinal trauma patients. The main findings of the follow-up were that the hazard ratio of mortality for COVID-19 infected patients was 2.5 (p < 0.001), compared with the mortality hazard ratio of COVID-19-negative patients. Restrictions during the pandemic significantly reduced population mobility helping slow down the spread of the virus and give time to healthcare systems to better prepare. At the same time, it also reduced the number of new neurotrauma cases. In case of spinal trauma patients, a rebound effect was observed after the restrictions, which may be due to increased mobility, activity and travel. The restrictive measures reduced trauma cases effectively, while not increased the time from injury to admission.