Background Trauma theatre time is valuable and previous studies reported cost of £24.77/minute. BSUH Children’s emergency department (CED) guidelines were implemented in December 2016, allowing reduction of forearm and distal radius (DR) fractures in CED using 70% nitrous (N2O) sedation. Due to COVID-19 pandemic and the risks associated with aerosol generating procedures as well as staffing levels, CED shifted to using 50%N2O with or without intranasal fentanyl. Method Relevant fractures presenting to CED from Feb-Dec 2020 were identified and compared to previous years. Demographics, treatment modality, timings, and outcomes were reviewed for 275 patients. Results In 2017-2018, 56% were manipulated in CED under 70%N2O (compared to only 3% in 2016). The main barrier identified was shortage of doctors trained in sedation to supervise use of 70%N20. In 2020, 101 patients were suitable for manipulation in CED. 64 had DR fractures, 37 midshaft fractures, 65 were male. Mean age: 10 years. 92 patients (91%) were manipulated in CED/fracture clinic. One was under 70%N2O; the rest used 50%N2O with or without intranasal fentanyl. 8 (9%) had manipulation under GA. Of those manipulated in CED, 3 were re-manipulated in clinic for cast problems. A typical MUA takes 30minutes indicating a saving of £743 per case; therefore, £68,356 over the study period. Conclusions Paediatric upper limb fracture manipulation in CED under N2O is effective and provides significant cost savings. Due to changes related to COVID-19 pandemic, considerably more patients in 2020 were safely treated in CED/clinic. Using 50%N2O improves uptake due to lower staffing requirements.

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