Predictive Value of Preoperative Rectus and Diaphragm Muscle Thickness for Postoperative Complications in Gastrointestinal Cancer Surgery

The aim of this observational study is to investigate the relationship between preoperative rectus abdominis and diaphragm muscle thickness and postoperative complication rates in patients undergoing surgery for gastrointestinal system malignancies. The main research question is whether rectus abdominis and diaphragm muscle thickness can be used to predict postoperative complications in these patients, and whether there are specific cut-off values for these muscle thicknesses. Participants will be selected from operable gastrointestinal malignancy cases, and preoperative measurements of rectus abdominis and diaphragm muscle thickness will be performed using ultrasonography.