The phase angle as a predictor of postoperative complications in patients undergoing lung cancer surgery

Purpose: The phase angle (PhA), calculated by bioelectrical impedance analysis, is used as a nutritional risk indicator. A low preoperative PhA has been reported as a marker of postoperative complications in patients with cancer; however, the relationship between the PhA and postoperative complications in patients with lung cancer remains unknown. We conducted this study to assess the predictive ability of the preoperative PhA for postoperative complications in patients undergoing surgery for primary lung cancer. Methods: We reviewed the data on 240 patients who underwent surgery for primary lung cancer at our institution between August, 2019 and August, 2021. Results: The PhA value in this study was 4.7 ± 0.7°. According to the Clavien–Dindo classification, grade ≥ II postoperative complications occurred in 53 patients (22.0%). Based on the multivariate logistic analysis, only the PhA (odds ratio, 0.51, 95% confidence interval, 0.29–0.90, p = 0.018) was an independent predictor of Clavien–Dindo grade ≥ II postoperative complications. Conclusions: The PhA may be a valuable marker for predicting the risk of postoperative complications following lung cancer surgery.