ArticleObesity surgery2015
Changes in Hematology and Calcium Metabolism After Gastric Bypass Surgery--a 2-Year Follow-Up Study.
Article in Obesity surgery, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers, 6 of them syntheses that pooled it.
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Who cites it
11 citing papers in PubMed, 6 syntheses or guidelines pooled it, 28 citations in OpenAlex.
- Changes in Nutritional Outcomes After Roux-en-Y Gastric Bypass: A Systematic Review and Meta-Analysis.Obesity surgery · 2024Pooled it
- A Systematic Review and Meta-Analysis of Vitamin D Status of Patients with Severe Obesity in Various Regions Worldwide.Obesity facts · 2023Pooled it
- Are There Ethnic Differences in Micronutrient Deficiencies in Preoperative Bariatric Patients? A Systematic Review and Meta-analysis.Obesity surgery · 2021Pooled it
- Iron, Vitamin BObesity surgery · 2020 · on this mapPooled it
- Oral Vitamin BObesity surgery · 2018Pooled it
- Hypovitaminosis D in bariatric surgery: A systematic review of observational studies.Metabolism: clinical and experimental · 2016Pooled it
- [Orthopedic interventions after metabolic and bariatric surgery].Chirurgie (Heidelberg, Germany) · 2025Review
- Pre-operative Obesity-Associated Hyperandrogenemia in Women and Hypogonadism in Men Have No Impact on Weight Loss Following Bariatric Surgery.Obesity surgery · 2020Article
- VITAMIN D DEFICIENCY AND PARATOHOMMONIUM INCREASE IN LATE POSTOPERATIVE GASTRIC BYPASS IN ROUX-EN-Y.Arquivos brasileiros de cirurgia digestiva : ABCD = Brazilian archives of digestive surgery · 2018Article
- Iron-Deficiency Anemia After Laparoscopic Roux-en-Y Gastric Bypass in Chinese Obese Patients with Type 2 Diabetes: a 2-Year Follow-Up Study.Obesity surgery · 2016Article
- Proton Pump Inhibitor Prophylaxis After Gastric Bypass Does Not Cause Hypomagnesemia.Obesity surgery · 2016Article
Corrections and comments
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Authors and funding
5 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundConcerns regarding nutritional deficiencies have recently emerged after Roux-en-Y gastric bypass (RYGB).
methodsA total of 835 subjects underwent RYGB, age 43.3 years, body mass index (BMI) 47.2 kg/m(2). Hematological and calcium metabolic variables were measured before, 6, 12, and 24 months after surgery. Daily supplement of 800 mg calcium, 800 U vitamin D, a multivitamin, and a vitamin B12 injection (1 mg) every third month was recommended. In subjects with low ferritin and decreasing hemoglobin levels, oral, or intravenous iron was administered.
resultsHemoglobin concentration decreased from before surgery to month 24 for both men (9.3 ± 0.05 vs. 8.3 ± 0.08 mmol/L, p < 0.001) and women (8.4 ± 0.03 vs. 7.7 ± 0.06 mmol/L, p < 0.001). At 24 months, anemia was present in 25.8 % of women and 22.1 % of men. Predictors of anemia in both sexes were baseline hemoglobin (p < 0.001), excessive weight loss in men, and younger age in women (p < 0.001). Plasma ferritin levels decreased in both sexes (p < 0.01), whereas concentrations of folic acid and vitamin B12 increased from before surgery to 24 months after surgery (p < 0.001). Vitamin D increased from baseline to month 24 in both sexes (p < 0.01). In women, PTH increased from baseline to month 24 (p < 0.05) with no changes in calcium or magnesium.
conclusionsSupplementation of calcium and vitamin D was sufficient. Iron substitution did not prevent anemia, which especially affected premenopausal women. More attention should be given to iron substitution after RYGB.
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