Which Factors Are Associated with a Higher Prevalence of Anemia Following Bariatric Surgery? Results from a Retrospectiv
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ORIGINAL CONTRIBUTIONS
Which Factors Are Associated with a Higher Prevalence of Anemia Following Bariatric Surgery? Results from a Retrospective Study Involving 1999 Patients Maria João Silva Ferreira 1,2,3 & Daniela Alves Salazar 1,2,3 & João Sérgio Neves 1,2,3 & Jorge Manuel Pires Pedro 1,2,3 & Vanessa Alexandra Guerreiro 1,2,3 & Sara e Silva Viana 4 & Fernando Mendonça 1,2,3 & Maria Manuel Silva 1,2,3 & Sandra Patrícia Belo 1 & Ana Varela Sande 1,2,3 & Flora Correia 5 & Paula Freitas 1,2,3 & Davide Maurício Carvalho 1,2,3 & Grupo AMTCO
# Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Introduction Anemia in obese patients is common and multifactorial and is also a complication of bariatric surgery. The aim of this study is to establish which variables are associated with a higher prevalence of post-bariatric surgery anemia. Methods Retrospective cohort study involving 1999 patients submitted to bariatric surgery with a follow-up period of 4 years. Anthropometric, laboratorial parameters and the presence of comorbidities were evaluated before surgery and during follow-up. Patients were divided into two groups, according to whether they developed anemia, or not. Groups were compared using independent sample T-tests or Chi-squared tests, as appropriate. Univariate binary logistic regression models were used to test the association between the diagnosis of anemia during follow-up and all the possible explanatory variables. Independent variables with an association with the outcome (p < 0.1) were included in multivariate binary logistic regression models, as well as possible confounders (age, BMI, and supplementation). Results Anemia was diagnosed in 24.4% of the patients. Females present a two-fold increased risk of developing anemia (OR 2.11, 95% CI 1.48–3.01, p < 0.001). Patients subjected to gastric sleeve and gastric band surgery present approximately half the risk of anemia when compared with gastric bypass surgery (RYGB) (OR 0.46, 95% CI 0.35–0.59, p < 0.001; OR 0.51, 95% CI 0.36–0.72, p < 0.001). None of the other variables evaluated showed association with the outcome. * Maria João Silva Ferreira [email protected]
Ana Varela Sande [email protected]
Daniela Alves Salazar [email protected]
Flora Correia [email protected]
João Sérgio Neves [email protected]
Paula Freitas [email protected]
Jorge Manuel Pires Pedro [email protected]
Davide Maurício Carvalho [email protected]
Vanessa Alexandra Guerreiro [email protected]
1
Department of Endocrinology, Diabetes and Metabolism, Centro Hospitalar Universitário de São João, Alameda Prof. Hernâni Monteiro, 4200-319 Porto, Portugal
2
Faculty of Medicine of University of Porto, Porto, Portugal
Fernando Mendonça [email protected]
3
Institute for Research and Innovation in Health, University of Porto, Porto, Portugal
Maria Manuel Silva [email protected]
4
Department of Internal Medicine, Unidade Local de Saúde do Norte Alentejano, Portalegre, Portu
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