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. 2022 Dec 19:35:e1707.
doi: 10.1590/0102-672020220002e1707. eCollection 2022.

THE INTESTINAL MICROBIOME IN PATIENTS UNDERGOING BARIATRIC SURGERY: A SYSTEMATIC REVIEW

João Kleber Almeida Gentile  1   2 , Karen Danielle Oliveira  3 , Júlia Guimarães Pereira  4 , Daniel Yuji Tanaka  4 , Giovanna Nagatsuka Guidini  4 , Melissa Zanetti Cadona  4 , Diego Werneck Siriani-Ribeiro  4 , Mariana Tafner Perondini  4
Affiliations

THE INTESTINAL MICROBIOME IN PATIENTS UNDERGOING BARIATRIC SURGERY: A SYSTEMATIC REVIEW

João Kleber Almeida Gentile et al. Arq Bras Cir Dig. .

Abstract
in English, Portuguese

Background: Dysbiosis of the gut microbiota is frequently found in cases of obesity and related metabolic diseases, such as type 2 diabetes mellitus. The composition of the microbiota in diabetics is similar to that of obese people, thereby causing increased energy uptake efficiency in the large intestine of obese people, maintenance of a systemic inflammatory state, and increased insulin resistance. Bariatric surgery seems to entail an improvement in gut dysbiosis, leading to an increased diversity of the gut microbiota.

Aims: This study aimed to present a literature review on obesity-associated gut dysbiosis and its status post-bariatric surgery.

Methods: A systematic review of primary studies was conducted in PubMed, SciELO, BIREME, LILACS, Embase, ScienceDirect, and Scopus databases using DeCS (Health Science Descriptors) with the terms "obesity," "intestinal dysbiosis," "bariatric surgery," and "microbiota."

Results: We analyzed 28 articles that had clinical studies or literature reviews as their main characteristics, of which 82% (n=23) corresponded to retrospective studies. The sample size of the studies ranged from 9 to 257 participants and/or fecal samples. The epidemiological profile showed a higher prevalence of obesity in females, ranging from 24.4 to 35.1%, with a mean age of around 25-40 years. There was a variation regarding the type of bariatric surgery, migrating between the Roux-en-Y bypass, adjustable gastric banding, and vertical gastrectomy. Of the 28 studies, 6 of them evaluated the gut microbiota of obese patients undergoing bariatric surgery and their relationship with type 2 diabetes mellitus/glucose metabolism/insulin resistance.

Conclusions: The intestinal microbiota is an important influencer in the regulation of the digestive tract, and obese individuals with comorbidities (diabetes mellitus, hypercholesterolemia, and metabolic syndrome) present important alterations, with an unbalance normal state, generating dysbiosis and the proliferation of bacterial species that favor the appearance of new diseases. Patients who undergo bariatric surgery present an improvement in the intestinal microbiota imbalance as well as reversibility of their comorbidities, increasing their life expectancy.

RACIONAL:: A disbiose da microbiota intestinal é encontrada frequentemente em casos de obesidade e doenças metabólicas relacionadas, como a diabetes mellitus tipo 2. A composição da microbiota em diabéticos é semelhante à de obesos, causando um aumento da eficiência de captação de energia no intestino grosso de obesos, manutenção de um estado inflamatório sistêmico e maior resistência à insulina. A cirurgia bariátrica parece acarretar em uma melhora da disbiose intestinal, levando ao aumento de diversidade da microbiota intestinal.

OBJETIVOS:: Este artigo apresenta uma revisão de literatura sobre a disbiose intestinal associada a obesidade e seu status pós cirurgia bariátrica.

MÉTODOS:: Uma revisão sistemática de estudos primários foi realizada em bases de dados PubMed, SciELO, BIREME, LILACS, Embase, ScienceDirect e Scopus utilizando o Descritores em Ciência da Saúde (DeCS) com os termos: “obesidade”, “disbiose intestinal”, “cirurgia bariátrica” e “microbiota”.

RESULTADOS:: Foram analisados 28 artigos que tinham como característica principal serem estudos clínicos ou revisões de literatura, dos quais 82%, n=23, correspondem a estudos retrospectivos. O tamanho das amostras dos estudos variou de 9 a 257 participantes e/ou amostras fecais. O perfil epidemiológico mostrou haver maior prevalência de obesidade no sexo feminino, variação de 24,4 a 35,1%, com idade média em torno dos 25 a 40 anos. Houve uma variação com relação ao tipo de cirurgia bariátrica, migrando entre a Bypass em Y-de-Roux, Banda gástrica ajustável e gastrectomia vertical. Dos 28 estudos, 6 deles avaliaram a microbiota intestinal de obesos submetidos à cirurgia bariátrica e sua relação com diabetes mellitus tipo 2/metabolismo da glicose/resistência insulínica.

CONCLUSÕES:: A microbiota intestinal é um importante influenciador na regulação do aparelho digestivo, e que indivíduos obesos com comorbidades (diabetes mellitus, hipercolesterolemia e síndrome metabólica) apresentam alterações importantes, com desequilíbrio do seu estado normal, gerando disbiose e a proliferação de espécies bacterianas que favorecem o aparecimento de novas doenças. Pacientes submetidos a cirurgia bariátrica apresentam melhora do desequilíbrio da microbiota intestinal, bem como uma reversibilidade de suas comorbidades, elevando a expectativa de vida.

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Conflict of interest statement

Conflicts of interest: None

Figures

Figure 1
Figure 1. Flowchart of the included articles.
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