Abstract:  Objective To compare patient generated subjective global assessment (PG-SGA) and nutritional risk screening table (NRS2002) scoring systems in preoperative nutritional status assessment of patients with advanced gastric cancer and pyloric obstruction. Methods A total of 114 patients from the Department of Gastric Surgery of the Liaoning Cancer Hospital were selected between July 2016 and July 2017. All patients were confirmed gastric cancer with outlet obstruction by gastroscopy and histopathology. All patients were treated with PG-SGA, NRS2002 scoring systems were used to assess the preoperative nutritional status. The serum albumin <30 g/L was used as the gold standard for the diagnosis of malnutrition. The receiver operating characteristic (ROC) curve was used to analyze the sensitivity and specificity of PG- SGA and NRS2002 scoring systems in patients with preoperative evaluation of nutritional status of gastric cancer with pyloric obstruction. Results Eighty cases (70.1%) were diagnosed as malnutrition by serum albumin in 114 patients. The area under the PG-SGA curve (AUC) was 0.858 and NRS2002 was 0.706. The sensitivity of PG-SGA to preoperative diagnosis of malnutrition in patients with advanced gastric cancer and pyloric obstruction was 88.75%, NRS2002 was 77.50%, the specificity of PG-SGA was 85.29%, and NRS2002 was 76.47%. Conclusion The PG-SGA scoring system is more suitable for the assessment of preoperative nutritional status in patients with advanced gastric cancer and pyloric obstruction, and has a high diagnostic efficiency.

Key words:  stomach neoplasms, pylorus, gastric outlet obstruction, malnutrition, sensitivity and specificity, nutrition assessment