CT-derived abdominal fat outperforms BMI for predicting prolonged ICU stay and ventilation in trauma

CT-derived abdominal fat tissue index (AATI) predicted ICU length of stay (+15.5% per SD) and ventilation duration (+30.8% per SD) in 142 trauma ICU survivors, while BMI did not; routine CT body composition may improve risk assessment.

• Retrospective matched cohort of 142 ICU survivors with moderate/severe trauma; CT body composition at L3 was measured using a previously validated deep learning segmentation model.
• Abdominal adipose tissue index (AATI) was independently associated with ICU length of stay (+15.5% per SD; p=0.016) and ventilation duration (+30.8% per SD; p<0.001) after adjustment for BMI, with confidence intervals excluding zero.
• Body mass index showed no significant correlation with ICU length of stay or ventilation duration.

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