title: Nutritional Risk Screening 2002 as a Predictor of Postoperative Outcomes in Patients Undergoing Abdominal Surgery: A Systematic Review and Meta-Analysis of Prospective Cohort Studies.
abstract: BACKGROUND
  The nutritional risk screening (NRS 2002) has been applied increasingly in patients who underwent abdominal surgery for nutritional risk assessment. However, the usefulness of the NRS 2002 for predicting is controversial. This meta-analysis was to examine whether a preoperative evaluation of nutritional risk by NRS 2002 provided prediction of postoperative outcomes in patients undergoing abdominal surgery.
  
  
  METHODS
  A systematic literature search for published papers was conducted using the following online databases: MEDLINE, EMBASE, the Cochrane library, EBSCO, CRD databases, Cinahl, PsycInfo and BIOSIS previews. The pooled odds ratio (OR) or weight mean difference (WMD) was calculated using a random-effect model or a fix-effect model.
  
  
  RESULTS
  Eleven studies with a total of 3527 patients included in this study. Postoperative overall complications were more frequent in nutritional risk patients versus patients without nutritional risk (the pooled OR 3.13 [2.51, 3.90] p<0.00001). The pooled OR of mortality for the nutritional risk group and non-nutritional risk group was 3.61 [1.38, 9.47] (p = 0.009). Furthermore, the postoperative hospital stay was significant longer in the preoperative nutritional risk group than in the nutritional normal group (WMD 5.58 [4.21, 6.95] p<0.00001).
  
  
  CONCLUSIONS
  The present study has demonstrated that patients at preoperative nutritional risk have increased complication rates, high mortality and prolonged hospital stay after surgery. However, NRS 2002 needs to be validated in larger samples of patients undergoing abdominal surgery by better reference method.
authors.affiliation: Department of Gastroenterology, Affiliated Hospital of Medical College of Qingdao University, Qingdao, 266003, Shandong Province, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Sun
authors.affiliation: Department of Gastroenterology, Affiliated Hospital of Medical College of Qingdao University, Qingdao, 266003, Shandong Province, China.
authors.forename: Xin-Juan
authors.initials: XJ
authors.lastname: Kong
authors.affiliation: Department of Gastroenterology, Affiliated Hospital of Medical College of Qingdao University, Qingdao, 266003, Shandong Province, China.
authors.forename: Xue
authors.initials: X
authors.lastname: Jing
authors.affiliation: Department of Gastroenterology, Affiliated Hospital of Medical College of Qingdao University, Qingdao, 266003, Shandong Province, China.
authors.forename: Run-Jun
authors.initials: RJ
authors.lastname: Deng
authors.affiliation: Department of Gastroenterology, Affiliated Hospital of Medical College of Qingdao University, Qingdao, 266003, Shandong Province, China.
authors.forename: Zi-Bin
authors.initials: ZB
authors.lastname: Tian
mesh_terms: D000005:Abdomen / Q000601:surgery; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007902:Length of Stay; D008297:Male; D008875:Middle Aged; D015596:Nutrition Assessment; D009752:Nutritional Status / Q000502:physiology*; D011183:Postoperative Complications / Q000209:etiology* / Q000503:physiopathology*; D011184:Postoperative Period; D011300:Preoperative Care; D011446:Prospective Studies; D018570:Risk Assessment; D055815:Young Adult