The raw data of the study.

ObjectiveThis study aims to look at the link between bioelectrical impedance analysis (BIA), especially phase angle (PA) and standardized phase angle (SPA), and how often postoperative infectious complications occur in patients with gastrointestinal tumors.Material and methodsWe chose 139 patients who had gastrointestinal tumor surgery. We did BIA tests on them, assessed their nutritional status with the Patient-Generated Subjective Global Assessment (PG-SGA) scale, checked body composition indicators, and tested their blood markers. The patients were categorized into high PA and low PA groups based on their PA values, and the differences in nutritional status-related indicators and infection rates between these groups were analyzed. Additionally, PA values were standardized, resulting in the formation of high SPA and low SPA groups, and further comparisons of nutritional indicators and infection rates between these groups were conducted.ResultsOur results show that PA and SPA are very important for checking the nutritional status of patients with digestive tract cancer. They are also closely linked to the chance of having postoperative complications. The study encompassed an analysis of 139 patients with digestive tract cancer, leading to several key conclusions: Firstly, a strong correlation was observed between PA and nutritional status, with malnourished patients demonstrating significantly lower PA values compared to those with adequate nutritional status. Secondly, the group with low PA was significantly associated with several adverse indicators, including advanced age, a higher proportion of females, increased prevalence of chronic diseases, lower BMI, elevated PG-SGA scores, higher incidence of sarcopenia, and reduced skeletal muscle mass and skeletal muscle index. Thirdly, patients categorized in the low SPA group exhibited a significantly higher incidence of complications relative to those in the high SPA group. Lastly, high SPA was significantly associated with a lower incidence of postoperative infectious complications, whereas TNM staging was significantly associated with a higher incidence of these complications.ConclusionThis study substantiates the utility of PA and SPA in evaluating the nutritional status of patients with digestive tract cancer and in being associated with postoperative complications. PA demonstrates a significant correlation with malnutrition, sarcopenia, and various body composition indicators, while SPA is significantly associated with postoperative infectious complications.

研究目的：本研究旨在探讨生物电阻抗分析（bioelectrical impedance analysis, BIA）相关指标，尤其是相位角（phase angle, PA）与标准化相位角（standardized phase angle, SPA），与胃肠道肿瘤患者术后感染并发症发生率之间的关联。
材料与方法：本研究纳入139例接受胃肠道肿瘤手术的患者。对所有患者进行生物电阻抗分析检测，采用患者主观整体营养评估（Patient-Generated Subjective Global Assessment, PG-SGA）量表评估其营养状态，检测身体成分指标及血液标志物。根据患者的PA值将其分为高PA组与低PA组，分析两组间营养状态相关指标及感染率的差异。此外，对PA值进行标准化处理，据此划分高SPA组与低SPA组，并进一步比较两组间的营养指标与感染发生率。
结果：本研究结果显示，PA与SPA可有效评估消化道癌症患者的营养状态，且与术后并发症发生风险密切相关。本研究共纳入139例消化道癌症患者，最终得出以下核心结论：其一，PA与营养状态存在显著相关性，营养不良患者的PA值显著低于营养状态良好者；其二，低PA组患者存在多项不良临床特征，包括高龄、女性占比更高、慢性病患病率更高、体质量指数（BMI）更低、PG-SGA评分更高、肌少症发生率更高，以及骨骼肌质量与骨骼肌指数更低；其三，低SPA组患者的并发症发生率显著高于高SPA组；其四，高SPA与术后感染并发症发生率降低显著相关，而TNM分期则与此类并发症发生率升高显著相关。
结论：本研究证实，PA与SPA可用于评估消化道癌症患者的营养状态，且与术后并发症发生存在关联。PA与营养不良、肌少症及多项身体成分指标存在显著相关性，而SPA则与术后感染并发症显著相关。