Impact of nutritional status/risk and post-operative nutritional management on clinical outcomes in patients undergoing gastrointestinal surgery: a prospective observational study.

Abstract

Malnutrition is prevalent in patients undergoing gastrointestinal (GI) surgery and has been linked to adverse outcomes. The present study aimed to determine the association between early post-operative nutritional status/risk, post-operative nutritional management and clinical outcomes. A prospective observational study was conducted in GI surgical patients with a minimum 3-day post-operative length of stay (LOS). Data on patient demographics, nutritional status/risk, post-operative nutritional management and clinical outcomes were collected. Four markers of nutritional status and risk were assessed: preoperative weight loss, nutrition risk, malnutrition status and hand grip strength. Clinical outcomes included: post-operative LOS, complication and readmissions rates. Multivariate linear and logistic regression were used to test for associations with clinical outcomes. One hundred and fifteen patients (55% female) with mean (SD) age of 60.8 (16.2) years were included. Median (IQR) post-operative LOS was 8.0days (4.5-11.5), 37% of participants developed at least one complication post-operatively and 24% were readmitted within 30-days of discharge. Mean number of nil-by mouth (NBM) days post-operatively was 0.7 (1.2) and the average time to commence feeding was 3.3 (2.2)days after surgery. Poor nutritional status/risk between days 3-5post-operatively assessed through all four markers was associated with longer post-operative LOS (all P<0.05). No association was found between number of NBM days, time to feeding and clinical outcomes. Poor early post-operative nutritional status/risk is associated with longer post-operative LOS in patients undergoing GI surgery, which may facilitate simple identification of patients at high priority for nutritional intervention. The present study highlights the heterogeneity in post-operative nutritional management practices.