Effect of computed tomography scanner location on time-to-computed tomography in the emergency department: A before and after study

Objectives To compare time metrics associated with a temporary disruption to ED computed tomography (CT) scanner location from adjacent to the ED with direct access from resuscitation rooms, to a location remote to the ED. Methods A retrospective before and after study was conducted in a public metropolitan ED with over 66 000 presentations annually. Time-to-CT metrics, operational time metrics and ED length of stay were extracted and analysed from presentations between October 2020 and January 2021. Results There were 3031 CT scans during the study period. Overall, the disruption was associated with a significant 27-36 min delay (P < 0.01) in time-to-CT start; these delays were also observed in a subset of trauma patients. In a subset of presumed stroke patients, time-to-brain perfusion was significantly delayed by up to 10 min (P < 0.01). There was a 14% (P < 0.01) greater demand for operational services and a time imposition of up to 8 min (P < 0.01) to transport patients to or from CT scanning when the CT scanner was located away from the ED. ED length of stay was consistent at all time points. Conclusion Although rapid, proximate access to CT scanning is often considered desirable in terms of the management of trauma and other time-critical emergencies, the wider time and resource implications demonstrated in this study suggest a potential broader benefit to co-located CT scanning in ED. Our experience could be considered in future re-design of EDs.