A prospective comparative study of the MNA-SF and GNRI nutritional screening tools in predicting infectious complication
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ORIGINAL ARTICLE
A prospective comparative study of the MNA‑SF and GNRI nutritional screening tools in predicting infectious complications among elderly patients over 70 years undergoing posterior lumbar arthrodesis Zhong‑En Li1,2,3 · Shi‑Bao Lu1,2 · Chao Kong1,2,3 · Wen‑Zhi Sun1,2,3 · Peng Wang1,2,3 · Si‑Tao Zhang1,2 Received: 1 July 2020 / Accepted: 22 September 2020 © Springer Nature Switzerland AG 2020
Abstract Malnutrition is a risk factor for postoperative infectious complications of elderly patients undergoing posterior lumbar arthrodesis. At present, there is no gold standard for nutrition screening tools. We analyzed the value of predicting infectious complications among elderly patients over 70 years undergoing posterior lumbar arthrodesis by comparing the MNA-SF and GNRI. Demographic data, anthropometric measurements, serum albumin, surgical data and the occurrence of infectious complications and LOS were collected. Mini Nutritional Assessment short form (MNA-SF), Geriatric Nutritional Risk Index (GNRI) were performed within 24 h before surgery. Multivariable logistic regression analyses were used to identify predictors of infectious complications. The discriminatory performances of GNRI and MNA-SF scores for the occurrence of infectious complications were determined by receiver operating characteristic curves (ROC) analyses and the area under the curve (AUC). The study included 252 patients with a median age of 76.82 ± 6.41 years (range 70–84 years), and 142 patients (56.3%) were female. There were no significant differences in infectious complications (p = 0.236) and LOS (p = 0.580) among different GNRI categories. 27.3% malnourished patients evaluated by the MNA-SF suffered from infectious complications and 10.1% patients at risk of malnourished had infectious complications. Those patients had statistically significant higher prevalence of infectious complications (p = 0.002) and longer LOS (p = 0.023) than well-nourished patients. Multivariable analysis revealed that preoperative malnutrition and at risk of malnourished by the MNA-SF was significantly associated with infections. The area under the curve (AUC) of MNA-SF was 0.754, which was significantly high than AUC of GNRI (0.623) (Delong’s test, p = 0.033). This study demonstrated that MNA-SF is a simple and effective tool for predicting the risk of infectious complications in elderly patients undergoing posterior lumbar arthrodesis. Keywords Elderly · Geriatric nutritional risk index · Infectious complication · Lumbar arthrodesis · Mini-nutritional assessment short form
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s40520-020-01725-7) contains supplementary material, which is available to authorized users. * Shi‑Bao Lu [email protected] 1
Department of Orthopedics, Xuanwu Hospital Capital Medical University, Beijing, China
2
National Clinical Research Center for Geriatric Diseases, Beijing, China
3
Capital Medical University, Beijing, China
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