The association between out of hours burn centre admission and in-hospital outcomes in patients with severe burns

Patients with severe burns (≥20 % total body surface area [TBSA]) have specific and time sensitive needs on arrival to the burn centre. Burn care systems in Australia and New Zealand are organised differently during weekday business hours compared to overnight and weekends. The aims of this study were to compare the profile of adult patients with severe burns admitted during business hours with patients admitted out of hours and to quantify the association between time of admission and in-hospital outcomes in the Australian and New Zealand context. Data were extracted from the Burns Registry of Australia and New Zealand for adults (≥18 years) with severe burns admitted to Australian or New Zealand burn centres between July 2016 and June 2020. Differences in patient profiles, clinical management, and in-hospital outcomes were investigated. Univariable and multivariable logistic and linear regression models were used to quantify associations between time of admission and in-hospital outcomes of interest. We found 623 patients eligible for inclusion. Most patients were admitted out of hours (69.2 %), their median age was 42 years, and most were male (78 %). The median size burn was 30 % TBSA and 32 % of patients had an inhalation injury. A greater proportion of patients admitted out of hours had alcohol and/or drugs involved with injury compared to patients admitted during business hours. No other differences between groups were observed. Patients in both groups had similar odds of dying in hospital (Odds Ratio [OR], 95 % Confidence Interval [95 %CI] 1.49 [0.64, 3.48]), developing acute kidney injury within 72 h (OR, 95 %CI 0.58 [0.32, 1.07]), or sepsis (OR, 95 %CI 1.04 [0.46, 2.35]). No association was found between time of admission and hospital (%, 95 %CI 1.00 [0.82, 1.23]) nor intensive care length of stay (%, 95 %CI 0.97 [0.73, 1.27]). In this first Australian and/or New Zealand study to explore the association between time of admission and burn patient in-hospital outcomes, out of hours admission was not associated with patient outcomes of interest. These findings support current models of care in Australian and New Zealand burn centres, however further investigation is required. Nonetheless, given most severe burns patients arrive out of hours to burn the centre, it is plausible that out of hours availability of senior burn clinicians will improve patient care and safety resilience within burn care systems. •Almost 70 % of patients arrived at Australia