Abstract
Background
Besides its advantages, bariatric surgery implicates a risk of nutritional deficiencies, which might result in impaired bone metabolism. We assessed the effect of laparoscopic sleeve gastrectomy (LSG) on blood markers of bone metabolism in obese patients during a 3-year observation period.
Methods
In 39 obese patients (29 women, 10 men, mean BMI 51.8 ± 6.8 kg/m2) undergoing LSG, we measured blood concentrations of 25-hydroxyvitamin D (25(OH)D), calcium, parathyroid hormone (PTH), bone alkaline phosphatase (BAP), and N-telopeptides crosslinks (NTx) before LSG and up to 3 years postoperatively. Vitamin D and calcium supplementations were recorded.
Results
LSG caused an excess weight loss (EWL) of 54 ± 20 % after 3 years. Before surgery, we found decreased levels of 25(OH)D and calcium in 80 and 5 % of the subjects, respectively, while increased levels of PTH, BAP, and NTx were found in 39, 28, and 21 %, respectively. Mean levels of NTx and the prevalence of elevated levels of NTx increased within 2 years (p < 0.001 and p < 0.01). Neither mean blood concentrations of 25(OH)D, calcium, PTH, and BAP nor relative prevalence of deficiencies regarding these markers changed during the study period. The supplementation rates of calcium and vitamin D increased postoperatively.
Conclusions
Morbid obesity is associated with pronounced changes of markers of bone metabolism; LSG did neither aggravate nor ameliorate vitamin D metabolism within a 3-year time period, but led to increased bone resorption 2 years postoperatively. Routine supplementation of calcium and vitamin D is not likely sufficient to compensate the obesity-associated deficiencies in bone metabolism.
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Acknowledgments
We thank Ruth Volland from the Pediatric Clinical Trial Unit of the Department of Pediatrics and Adolescents Medicine at the University Hospital Cologne, Germany, for her help regarding the statistical analysis of the data. Furthermore, we thank Maria Seitzer from the Department of General, Visceral, and Transplant Surgery of the University Hospital of Tuebingen, Germany - she supported us in the laboratory measurements of NTx. This work was supported by the “Competence Network of Obesity,” research group “Obesity and the gastrointestinal tract”, coordinated by SCB and funded by the Federal Ministry of Education and Research, Germany (No. FKZ 01GI0843). The sponsor had no influence on the study design, analysis, and interpretation of data, as well as in the writing of the manuscript.
Conflict of Interest
Asja E. Schollenberger, Jaana M. Heinze, Tobias Meile, Andreas Peter, Alfred Königsrainer, and Stephan C. Bischoff declare that they have no conflict of interest.
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Informed consent was obtained from all individual participants included in the study.
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All procedures performed in studies involving human participants were in accordance with the ethical standard of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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The work has been performed at the Department of General, Visceral, and Transplant Surgery of the University Hospital of Tuebingen, Tuebingen, Germany.
Registration: at clinicaltrials.gov (No. NCT01344525)
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Schollenberger, A.E., Heinze, J.M., Meile, T. et al. Markers of Bone Metabolism in Obese Individuals Undergoing Laparoscopic Sleeve Gastrectomy. OBES SURG 25, 1439–1445 (2015). https://doi.org/10.1007/s11695-014-1509-2
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DOI: https://doi.org/10.1007/s11695-014-1509-2