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de Almeida PC, Lima TDR, Avila ETP, Damazo AS. Short-term effects of Roux-en-Y gastric bypass or gastric sleeve on bone mineral density and calciotropic hormones: a systematic review and meta-analysis. Surg Obes Relat Dis 2024:S1550-7289(24)00114-X. [PMID: 38594090 DOI: 10.1016/j.soard.2024.03.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 01/28/2024] [Accepted: 03/02/2024] [Indexed: 04/11/2024]
Abstract
Roux-en-Y gastric bypass (RYGB) and gastric sleeve (GS) have been associated with significant reductions in bone mineral density (BMD) and fluctuations in serum levels of calciotropic hormones. These changes pose a risk to bone health. The study assessed the short-term (12 and 24 months) effects of RYGB and GS on BMD and calciotropic hormones. PubMed, Embase, and Cochrane Library databases were searched. Analyses considered follow-up (12 and 24 months) with BMD as main outcome at three sites (femoral neck, total hip, and lumbar spine) and one for each calciotropic hormone (25 OH vitamin D and parathyroid hormone [PTH]). Estimated effect sizes were calculated as standardized mean differences (SMD), confidence interval of 95%, and P value. Nine studies totaling 473 participants (RYGB = 261 and GS = 212) were included. RYGB resulted in lower BMD than GS at 12 months for femoral neck (SMD = -0.485, 95% CI [-0.768, -0.202], P = .001), lumbar spine (SMD = -0.471, 95% CI [-0.851, -0.092], P = .015), and total hip (SMD = -0.616, 95% CI [-0.972, -0.259], P = .001), and at 24 months for total hip (SMD = -0.572, 95% CI [-0.907, -0.238], P = .001). At 24 months, 25 OH vitamin D was lower in RYGB than GS (SMD = -0.958 [-1.670, -0.245], P = .008) and PTH levels were higher in RYGB than in GS (SMD = 0.968 [0.132, 1.804, P = .023]). RYGB demonstrated significant reduction in regional BMD. It also induces lower serum 25 OH vitamin D and higher PTH levels than GS. The results support the need for preventive bone health measures in the short-term postoperative period, especially in the case of RYGB.
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Affiliation(s)
- Paula Caroline de Almeida
- Faculty of Medicine, Federal University of Mato Grosso, Brazil, Postgraduate Program in Health Sciences, Cuiabá, Mato Grosso, Brazil
| | - Thiago da Rosa Lima
- Faculty of Medicine, Federal University of Mato Grosso, Brazil, Postgraduate Program in Health Sciences, Cuiabá, Mato Grosso, Brazil; Faculty of Medicine, University Center of Várzea Grande - UNIVAG, Várzea Grande, Mato Grosso, Brazil.
| | - Eudes Thiago Pereira Avila
- Faculty of Medicine, Federal University of Mato Grosso, Brazil, Postgraduate Program in Health Sciences, Cuiabá, Mato Grosso, Brazil
| | - Amílcar Sabino Damazo
- Faculty of Medicine, Federal University of Mato Grosso, Brazil, Postgraduate Program in Health Sciences, Cuiabá, Mato Grosso, Brazil
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Baugh KA, McCoy KL, Leung JH, Carty SE, Ramonell KM, Yip L. Normocalcemic hyperparathyroidism: Intervention to differentiate primary from secondary hyperparathyroidism. Surgery 2024; 175:166-171. [PMID: 37981554 DOI: 10.1016/j.surg.2023.06.056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 05/05/2023] [Accepted: 06/20/2023] [Indexed: 11/21/2023]
Abstract
BACKGROUND Normocalcemic hyperparathyroidism can occur, but surgery should not be considered until common etiologies for secondary hyperparathyroidism are comprehensively excluded. Calcium deficiency is an underrecognized cause of normocalcemic parathyroid hormone elevation, and we aim to determine if the implementation of a preoperative calcium challenge can be used to reduce unnecessary parathyroidectomy. METHODS Consecutive patients referred for parathyroidectomy (1/21-6/22) with normocalcemia (serum calcium <10 mg/dL) and concurrently elevated parathyroid hormone levels were routinely treated with supplemental calcium and vitamin D3, and follow-up laboratory studies were assessed. RESULTS A total of 29/314 (9%) patients had normocalcemic parathyroid hormone elevation with mean calcium, parathyroid hormone, and vitamin D 25OH levels of 9.5 ± 0.3 mg/dL, 109.9 ± 34.9 pg/mL, and 42.7 ± 23.8 ng/mL respectively. Confounding factors included estimated glomerular filtration rate <60 in 2, loop diuretic use in 4, and prior gastric bypass or gastric sleeve surgery in 4. Follow-up biochemical evaluation was available in 27 (92%); results were unchanged in 7 patients (26%); normalization of parathyroid hormone levels with persistently normal calcium levels occurred in 15 (55%), thus confirming secondary hyperparathyroidism and hypercalcemia with elevated parathyroid hormone levels (classic primary hyperparathyroidism) was diagnosed in 5 (19%). Parathyroid exploration has been completed for 3 of 5 patients with classic primary hyperparathyroidism to date. CONCLUSION A preoperative calcium challenge was prospectively initiated in normocalcemic patients with parathyroid hormone elevation, and there was high compliance (92%). Short-interval calcium supplementation revealed ∼50% to have resolved secondary hyperparathyroidism due to insufficient calcium intake, which avoided unnecessary surgery. In contrast, classic patients were unveiled in 20%, allowing for prompt and correct surgical intervention.
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Affiliation(s)
| | - Kelly L McCoy
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA
| | - Janet H Leung
- Department of Endocrinology, University of Pittsburgh, Pittsburgh, PA
| | - Sally E Carty
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA
| | | | - Linwah Yip
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA
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Povaliaeva A, Zhukov A, Tomilova A, Bondarenko A, Ovcharov M, Antsupova M, Ioutsi V, Shestakova E, Shestakova M, Pigarova E, Rozhinskaya L, Mokrysheva N. Dynamic Evaluation of Vitamin D Metabolism in Post-Bariatric Patients. J Clin Med 2023; 13:7. [PMID: 38202014 PMCID: PMC10779498 DOI: 10.3390/jcm13010007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 12/07/2023] [Accepted: 12/13/2023] [Indexed: 01/12/2024] Open
Abstract
BACKGROUND findings from the previously conducted studies indicate altered regulatory mechanisms of calcium and vitamin D metabolism in obese patients and a role for bariatric surgery in regulating vitamin D metabolism; however, the available data is controversial and does not provide an adequate understanding of the subject. METHODS we evaluated serum parameters of vitamin D and mineral metabolism (vitamin D metabolites (25(OH)D3, 25(OH)D2, 1,25(OH)2D3, 3-epi-25(OH)D3, and 24,25(OH)2D3), vitamin D-binding protein (DBP), free 25(OH)D, fibroblast growth factor 23 (FGF-23), parathyroid hormone (PTH), total calcium, albumin, phosphorus, creatinine, magnesium) in 30 patients referred for bariatric surgery in comparison with 30 healthy volunteers of similar age, sex and baseline 25(OH)D3. Patients were also followed up with repeated laboratory assessments 3 months and 6 months after surgery. During the first 3 months, patients were prescribed high-dose cholecalciferol therapy (50,000 IU per week), with subsequent correction based on the results of the 3-month visit examination. RESULTS Preoperatively, patients with morbid obesity were characterized by a high prevalence of vitamin D deficiency (median 25(OH)D3 level 11.9 (6.8; 22.2) ng/mL), significantly lower levels of active vitamin D metabolite 1,25(OH)2D3 (20 (10; 37) vs. 39 (33; 50) pg/mL, p < 0.001), lower serum albumin-adjusted calcium levels (2.24 (2.20; 2.32) vs. 2.31 (2.25; 2.35) mmol/L, p = 0.009) and magnesium levels (0.79 (0.72; 0.82) vs. 0.82 (0.78; 0.85) mmol/L, p = 0.043) with simultaneous similar PTH levels (p = 0.912), and higher DBP levels (328 (288; 401) vs. 248 (217; 284) mg/L, p < 0.001). The 25(OH)D3 levels remained suboptimal (24.5 (14.7; 29.5) ng/mL at the 3-month visit and 17.9 (12.4; 21.0) ng/mL at the 6-month visit, p = 0.052) despite recommended high-dose cholecalciferol supplementation. Patients also demonstrated an increase in 1,25(OH)2D3 levels (38 (31; 52) pg/mL at the 3-month visit and 49 (29; 59) pg/mL at the 6-month visit, p < 0.001) without a change in PTH or calcium levels during the follow-up. CONCLUSION our results of a comprehensive laboratory evaluation of vitamin D status and mineral metabolism in patients undergoing bariatric surgery highlight the importance of improving current clinical guidelines, as well as careful monitoring and education of patients.
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Affiliation(s)
| | - Artem Zhukov
- The National Medical Research Centre for Endocrinology, 117292 Moscow, Russia; (A.P.); (A.T.); (A.B.); (M.O.); (M.A.); (V.I.); (E.S.); (M.S.); (E.P.); (L.R.); (N.M.)
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Cao L, Liang S, Yu X, Guan B, Yang Q, Ming WK, Chen Y. Change in Mineral Status After Bariatric Surgery: a Meta-analysis. Obes Surg 2023; 33:3907-3931. [PMID: 37872256 DOI: 10.1007/s11695-023-06888-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 10/03/2023] [Accepted: 10/04/2023] [Indexed: 10/25/2023]
Abstract
BACKGROUND The risk of protein and vitamin deficiencies after bariatric surgery has been well studied, but the change in mineral status has not gotten enough attention. This study aimed to perform a meta-analysis regarding the change in mineral levels after bariatric surgery and the prevalence of postoperative mineral deficiency, with subgroup analyses of different surgical procedures, study regions, and follow-up time. METHODS CENTRAL, PubMed, and EMBASE were searched for related articles. Meta-analysis, subgroup analysis, and sensitivity analysis were performed if necessary. RESULTS A total of 107 articles with 47,432 patients were included. The most severe mineral deficiency after bariatric surgery was iron (20.1%), followed by zinc (18.3%), copper (14.4%), chlorine (12.2%), phosphorus (7.5%), and calcium (7.4%). Serum concentrations of potassium, sodium, selenium, manganese, and molybdenum showed no significant change before and after surgery. Subgroup analyses revealed that SG had fewer deficiencies in serum iron, calcium, zinc, magnesium, phosphorus, copper, and selenium than RYGB. OAGB showed a higher incidence of serum iron and zinc deficiencies than RYGB. Studies conducted in different regions also found various mineral statuses after surgery. Studies with follow-up ≥ 5 years had a lower prevalence of zinc, copper, and selenium deficiencies than follow-up < 5 years. CONCLUSION A high deficiency rate of serum iron, zinc, copper, chlorine, phosphorus, and calcium was seen after bariatric surgery. The difference in surgical procedures, study regions, and follow-up time may affect postoperative mineral status; more targeted mineral supplement programs are needed considering these influencing factors.
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Affiliation(s)
- Li Cao
- College of Nursing, Jinan University, Guangzhou, 510632, China
| | - Sihua Liang
- Medical Imaging Center, First Affiliated Hospital of Jinan University, Guangzhou, 510630, China
| | - Xuefen Yu
- Comprehensive Special Diagnosis Department, First Affiliated Hospital of Jinan University, Guangzhou, 510630, China
| | - Bingsheng Guan
- Department of Gastrointestinal Surgery, First Affiliated Hospital of Jinan University, Guangzhou, 510630, China.
| | - Qiaohong Yang
- College of Nursing, Jinan University, Guangzhou, 510632, China.
| | - Wai-Kit Ming
- Department of Infectious Diseases and Public Health, Jockey Club College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Hong Kong, 999077, China.
| | - Yanya Chen
- College of Nursing, Jinan University, Guangzhou, 510632, China.
- Department of Infectious Diseases and Public Health, Jockey Club College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Hong Kong, 999077, China.
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Maïmoun L, Aouinti S, Puech M, Lefebvre P, Deloze M, de Santa Barbara P, Cristol JP, Brabant S, Gautier T, Nedelcu M, Renard E, Picot MC, Mariano-Goulart D, Nocca D. Effect of Nutritional Deprivation after Sleeve Gastrectomy on Bone Mass, Periostin, Sclerostin and Semaphorin 4D: A Two-Year Longitudinal Study. Nutrients 2023; 15:4310. [PMID: 37892386 PMCID: PMC10610316 DOI: 10.3390/nu15204310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/06/2023] [Accepted: 10/08/2023] [Indexed: 10/29/2023] Open
Abstract
Bariatric surgery induces bone loss, but the exact mechanisms by which this process occurs are not fully known. The aims of this 2-year longitudinal study were to (i) investigate the changes in areal bone mineral density (aBMD) and bone turnover markers following sleeve gastrectomy (SG) and (ii) determine the parameters associated with the aBMD variations. Bone turnover markers, sclerostin, periostin and semaphorin 4D were assessed before and 1, 12 and 24 months after SG, and aBMD was determined by DXA at baseline and after 12 and 24 months in 83 patients with obesity. Bone turnover increased from 1 month, peaked at 12 months and remained elevated at 24 months. Periostin and sclerostin presented only modest increases at 1 month, whereas semaphorin 4D showed increases only at 12 and 24 months. A significant aBMD decrease was observed only at total hip regions at 12 and 24 months. This demineralisation was mainly related to body weight loss. In summary, reduced aBMD was observed after SG in the hip region (mechanical-loading bone sites) due to an increase in bone turnover in favour of bone resorption. Periostin, sclerostin and semaphorin 4D levels varied after SG, showing different time lags, but contrary to weight loss, these biological parameters did not seem to be directly implicated in the skeletal deterioration.
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Affiliation(s)
- Laurent Maïmoun
- Département de Biophysique, Université Montpellier, Service de Médecine Nucléaire, Hôpital Lapeyronie, 371, Avenue du Doyen Gaston Giraud, CHU de Montpellier, CEDEX 5, 34295 Montpellier, France;
- Physiology and Experimental Medecine of the Heart and Muscles (PhyMedExp), Université de Montpellier, INSERM, CNRS, 34295 Montpellier, France;
| | - Safa Aouinti
- Unité de Recherche Clinique et Epidémiologie, CHU de Montpellier, Université de Montpellier, 34295 Montpellier, France; (S.A.); (M.-C.P.)
| | - Marion Puech
- Service de Chirurgie Digestive A, Hôpital Saint Eloi, CHU de Montpellier, 34295 Montpellier, France; (M.P.); (M.D.); (D.N.)
| | - Patrick Lefebvre
- Department of Endocrinology and Diabetes, Lapeyronie Hospital, CHU de Montpellier, University of Montpellier, INSERM, CNRS, 34295 Montpellier, France; (P.L.); (E.R.)
| | - Mélanie Deloze
- Service de Chirurgie Digestive A, Hôpital Saint Eloi, CHU de Montpellier, 34295 Montpellier, France; (M.P.); (M.D.); (D.N.)
| | - Pascal de Santa Barbara
- Physiology and Experimental Medecine of the Heart and Muscles (PhyMedExp), Université de Montpellier, INSERM, CNRS, 34295 Montpellier, France;
| | - Jean-Paul Cristol
- Laboratoire de Biochimie, Hôpital Lapeyronie, CHU de Montpellier, 34295 Montpellier, France;
| | - Séverine Brabant
- Laboratoire des Explorations Fonctionnelles, Hôpital Necker Enfants Malades, APHP, 75015 Paris, France;
| | | | | | - Eric Renard
- Department of Endocrinology and Diabetes, Lapeyronie Hospital, CHU de Montpellier, University of Montpellier, INSERM, CNRS, 34295 Montpellier, France; (P.L.); (E.R.)
| | - Marie-Christine Picot
- Unité de Recherche Clinique et Epidémiologie, CHU de Montpellier, Université de Montpellier, 34295 Montpellier, France; (S.A.); (M.-C.P.)
| | - Denis Mariano-Goulart
- Département de Biophysique, Université Montpellier, Service de Médecine Nucléaire, Hôpital Lapeyronie, 371, Avenue du Doyen Gaston Giraud, CHU de Montpellier, CEDEX 5, 34295 Montpellier, France;
- Physiology and Experimental Medecine of the Heart and Muscles (PhyMedExp), Université de Montpellier, INSERM, CNRS, 34295 Montpellier, France;
| | - David Nocca
- Service de Chirurgie Digestive A, Hôpital Saint Eloi, CHU de Montpellier, 34295 Montpellier, France; (M.P.); (M.D.); (D.N.)
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Nimeri A. Comment on: Bariatric surgery and secondary hyperparathyroidism: a meta-analysis. Surg Obes Relat Dis 2023; 19:10. [PMID: 36347761 DOI: 10.1016/j.soard.2022.10.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 10/09/2022] [Indexed: 11/06/2022]
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Barzin M, Ebadinejad A, Khalaj A, Mahdavi M, Valizadeh M, Hosseinpanah F. Determinants of Secondary Hyperparathyroidism 1 Year After One-Anastomosis Gastric Bypass or Sleeve Gastrectomy. Obes Surg 2023; 33:156-163. [PMID: 36319824 DOI: 10.1007/s11695-022-06337-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 10/13/2022] [Accepted: 10/18/2022] [Indexed: 11/07/2022]
Abstract
PURPOSE Bariatric surgery alters the anatomic and physiological structure of the gastrointestinal tract, predisposing patients to the malabsorption of nutrients. The purpose of this study was to determine the prevalence and determinants of secondary hyperparathyroidism (SHPT) in the patients undergoing either one-anastomosis gastric bypass (OAGB) or sleeve gastrectomy (SG). MATERIALS AND METHODS A total of 517 patients (without SHPT at the baseline) who had undergone OAGB or SG were prospectively assessed 1 year after the surgery. Anthropometric parameters, calcium, intact parathyroid hormone (iPTH), and 25(OH)D levels were compared according to the surgery type before and 1 year after surgery. Multiple logistic regression models were used to evaluate possible SHPT predictors after bariatric surgery. RESULTS The overall prevalence of SHPT was 12.6% after surgery, significantly different between the OAGB and SG groups (17.1 vs. 9.9%, respectively). The serum levels of albumin-corrected calcium and 25(OH)D were not significantly different between the two groups. The patients undergoing OAGB had significantly higher serum levels of ALP (198.2 vs. 156.6) compared to the subjects undergoing SG. Higher iPTH levels preoperatively, lower 1-year excess weight loss%, and OAGB surgery seemed to be independent predictors for SHPT 1 year after surgery. CONCLUSION Morbidly-obese patients undergoing OAGB had a higher risk of SHPT than their counterparts undergoing SG, whereas 25(OH)D deficiency and calcium levels did not differ between the two groups. The OAGB procedure, preoperative iPTH levels, and 1-year weight loss were predictors of postoperative SHPT development.
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Affiliation(s)
- Maryam Barzin
- Obesity Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Amir Ebadinejad
- Obesity Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Alireza Khalaj
- Tehran Obesity Treatment Center, Department of Surgery, Faculty of Medicine, Shahed University, Tehran, Iran
| | - Maryam Mahdavi
- Obesity Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Majid Valizadeh
- Obesity Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Farhad Hosseinpanah
- Obesity Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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Corsi GC, Pinheiro MCDA, Caldas APS, Dias MCG, Santo MA, Pajecki D. BONE HEALTH ASSESSMENT OF ELDERLY PATIENTS UNDERGOING BARIATRIC SURGERY. ARQUIVOS DE GASTROENTEROLOGIA 2022; 59:513-521. [PMID: 36515347 DOI: 10.1590/s0004-2803.202204000-91] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 08/15/2022] [Indexed: 11/16/2022]
Abstract
BACKGROUND Bariatric surgery promotes changes in body composition, that can include the loss of bone mineral density (BMD). There is a lack of studies on the evolution of bone health of elderly people who underwent bariatric surgery, in general, and when comparing the gastric bypass (GB) and sleeve gastrectomy (SG) techniques. OBJECTIVE To evaluate the bone health of elderly patients with obesity undergoing bariatric surgery. METHODS This is a prospective randomized clinical study, that was carried out with individuals of both sexes, ≥65 years, undergoing GB or SG and who met the inclusion criteria. Age, gender and comorbidities (type 2 diabetes mellitus, arterial hypertension, dyslipidemia and osteoarthrosis) were collected and analyzed at baseline. Anthropometric data (weight, body mass index, percentage of weight loss, percentage of excess weight loss), laboratory tests related to bone health and bone mineral density were analyzed before and 24 months after surgery. RESULTS A total of 36 patients (GB, n=18; SG, n=18) were evaluated. At baseline, except for sex and preoperative body mass index, which was higher in GB, groups were similar. After 24 months, GB was superior for weight loss (%WL) and excess weight loss (%EWL). Regarding bone health, a significant decrease of BMD was observed in the spine, total proximal femur and femoral neck in all groups, with an average decrease of 5.1%, 10.5% and 15.1%, respectively. In addition, the observed decrease in BMD was up to 25% in the total femur after 24 months, six patients went from normal BMD to osteopenia and one from osteopenia to osteoporosis. There was no difference in parathormone values. However, there was an association between the increase in parathormone and the decrease in BMD in the spine, mainly in the GB group. There was no association between %WL and %EWL with the reduction in BMD. CONCLUSION Bariatric surgery was related to the reduction of BMD in elderly patients, but there was no statistical difference between the two surgical techniques.
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Affiliation(s)
- Giovanna Cavanha Corsi
- Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Divisão de Nutrição e Dietética, São Paulo, SP, Brasil
| | - Moisés Carmo Dos Anjos Pinheiro
- Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Divisão de Nutrição e Dietética, São Paulo, SP, Brasil
| | - Ana Paula Silva Caldas
- Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Divisão de Nutrição e Dietética, São Paulo, SP, Brasil
| | - Maria Carolina Gonçalves Dias
- Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Divisão de Nutrição e Dietética, São Paulo, SP, Brasil
| | - Marco Aurelio Santo
- Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Unidade de Cirurgia Bariátrica e Metabólica, Departamento de Gastroenterologia, Divisão Cirúrgica, São Paulo, SP, Brasil
| | - Denis Pajecki
- Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Unidade de Cirurgia Bariátrica e Metabólica, Departamento de Gastroenterologia, Divisão Cirúrgica, São Paulo, SP, Brasil
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