Background: Mechanism of injury (MOI) plays a significant role in a decision to perform whole-body computed tomography (CT) imaging for trauma patients. Various mechanisms have unique patterns of injury and therefore form an important variable in decision making.
Methods: Retrospective cohort study including all patients >18 years old who received a whole-body CT scan between 1 January 2019 and 19 February 2020. The outcomes were divided into CT 'positive' if any internal injuries were detected and CT 'negative' if no internal injuries were detected. The MOI, vital sign parameters, and other relevant clinical examination findings at presentation were recorded.
Results: 3920 patients met the inclusion criteria, of which 1591 (40.6%) had a positive CT. The most common MOI was fall from standing height (FFSH), accounting for 23.0%, followed by motor vehicle accident (MVA), accounting for 22.4%. Covariates significantly associated with a positive CT included age, MVA >60 km/h, motor bike, bicycle, or pedestrian accident >30 km/h, prolonged extrication >30 min, fall from height above standing, penetrating chest or abdominal injury, as well as hypotension, neurological deficit, or hypoxia on arrival. FFSH was shown to reduce the risk of a positive CT overall, however, sub-analysis of FFSH in patients >65 years showed a significant association with a positive CT (OR 2.34, p < 0.001) compared to <65 years.
Conclusions: Pre-arrival information including MOI and vital signs have significant impact on identifying subsequent injuries with CT imaging. In high energy trauma, we should consider the need for whole-body CT based on MOI alone regardless of the clinical examination findings. However, for low-energy trauma, including FFSH, in the absence of clinical examination findings which support an internal injury, a screening whole-body CT is unlikely to yield a positive result, particularly in the age group <65yo.
Keywords: Body; CT; Mechanism; Trauma.
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