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Development and Internal/External Validation of a Prediction Model for Weight Loss Following Gastric Cancer Surgery: A Multicenter Retrospective Study
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Ji-Hyeon Park, Seong-Ho Kong, Do Joong Park, Han-Kwang Yang, Jong Won Kim, Ki Bum Park, In Cho, Sun-Hwi Hwang, Dong-Wook Kim, Su Mi Kim, Seung-Wan Ryu, Seong Chan Gong, Pil Young Jung, Hoon Ryu, Sung Geun Kim, Chang In Choi, Dae-Hwan Kim, Sung-IL Choi, Ji-Ho Park, Dong Jin Park, Gyu-Yeol Kim, Yunhee Choi, Hyuk-Joon Lee
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Ann Clin Nutr Metab 2022;14(2):55-65. Published online December 1, 2022
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DOI: https://doi.org/10.15747/ACNM.2022.14.2.55
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 Abstract
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- Purpose: To develop an individualized model for predicting the extent of unintentional weight loss following gastrectomy in patients with gastric cancer based on related risk factors and to externally validate this model using multicenter clinical data in Korea.
Materials and Methods: Among gastric cancer patients who underwent curative gastrectomy at 14 different gastric cancer centers, clinical data from patients with more than one weight measurement during the three-year follow-up period were retrospectively collected. Risk factors associated with weight loss in gastric cancer patients after gastrectomy were analyzed, and a predictive model was developed. Internal and external validation were performed.
Results: The data from 2,649 patients were divided into a derivation set (n=1,420 from Seoul National University Hospital) and validation set (n=1,229 from 13 different gastric cancers). Postoperative duration (six vs. 12, 24, or 36 months), sex (female vs. male), age, preoperative body mass index, type of surgery (pylorus-preserving vs. total, distal or proximal gastrectomy), and cancer stage (I vs. II or III) were included in the final prediction model. The model showed approximately 20% accuracy in predicting weight loss at each period: R2 at six, 12, 24 and 36 months after gastrectomy in internal validation=0.20, 0.21, 0.17, and 0.18, respectively, and in external validation=0.20, 0.22, 0.18, and 0.18, respectively. Calibration slopes of internal and external validation were 0.95 and 1.0, respectively.
Conclusion: Although predictive accuracy of the model did not reach an acceptable level, repeated external validation measurements showed high reliability. The model may serve as a basic reference in clinical practice.
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Incidence and Management of Micronutrient Deficiencies in Post-bariatric Surgery Patients
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Young Suk Park, Ki Bum Park, Sa-Hong Min, Yoontaek Lee, Sang-Hoon Ahn, Do Joong Park, Hyung-Ho Kim
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J Clin Nutr 2017;9(2):48-55. Published online December 31, 2017
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DOI: https://doi.org/10.15747/jcn.2017.9.2.48
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Abstract
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Bariatric surgery is considered one of the most effective methods of achieving long-term weight loss in morbidly obese patients. Nevertheless, bariatric procedures are associated with a number of complications, and nutrient deficiencies can lead to deleterious consequences. Furthermore, the diet of patients prior to bariatric surgery is often of poor nutrition quality that does not meet the recommended dietary guidelines for micronutrient intake. Therefore, optimization of the postoperative nutritional status should begin before surgery. This review covers the essential information about micronutrient management in patients before and after bariatric surgery.
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