Previous reports have shown that a low attenuated area(LAA)in chest CT reflects the prognosis or therapeutic outcomes for chronic obstructive pulmonary disease(COPD). COPD has been reported as one of the important predictive factors for postoperative pulmonary complications(PPCs). In this retrospective study, we analyzed 100 patients who underwent surgery for gastric or colorectal cancer between January 2020 and August 2022, and investigated the impact of the LAA volume ratio(LAAv%)on short term surgical outcomes. Twenty-two cases developed PPCs, and their Clavien-Dindo grades were Grade Ⅰ-Ⅱ(for 21 patients)and Grade Ⅳa(in 1). We found that high-LAAv% and high-BMI were independent risk factors of PPCs in uni- and multi-variate analyses. In a sub analysis of the limited high-LAAv% group, surgical time qA found to be an independent risk factor of PPCs, and it's cut-off value was calculated as 189 minutes(sensitivity 88.2%, specificity 42.4%). The incidence of PPCs might be avoidable in patients with high-LAAv% through selection of the surgical approach or applying respiratory function training when appropriate.
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