Alberto Meyer

Prof. Dr. Alberto Meyer

Sao Paulo University School of Medicine
orcid

Research Focus & Metrics

Academic Career Length

20Years (2007-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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25 April 2024 in Scientific Reports
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Journal Article
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LPLeonardo Zumerkorn Pipek
Leonardo Zumerkorn Pipek
WMWalter Augusto Fabio Moraes
Walter Augusto Fabio Moraes
RNRodrigo Massato Nobetani
Rodrigo Massato Nobetani
VCVitor Santos Cortez
Vitor Santos Cortez
ACAlberto Santos Condi
Alberto Santos Condi
WAWellington Andraus
Wellington Andraus
Obesity is a highly prevalent disease with numerous complications. Both intensive medical treatment with the use of pharmacological drugs and bariatric surgery are current options. The objective of this meta-analysis was to compare, in the long-term, intensive medical treatment and surgery based on twelve parameters related to weight loss, cardiovascular and endocrine changes. A review of the literature was conducted in accordance with the PRISMA guidelines (PROSPERO: CRD42021265637). The literature screening was done from inception to October 2023 through PubMed, EMBASE and Web of Science databases. We included randomized clinical trials that had separate groups for medical treatment and bariatric surgery as an intervention for obesity. The risk of bias was assessed through RoB2. A meta-analysis was performed with measures of heterogeneity and publication bias. Subgroup analysis for each surgery type was performed. Data is presented as forest-plots. Reviewers independently identified 6719 articles and 6 papers with a total 427 patients were included. All studies were randomized controlled trials, three had a follow up of 5 years and two had a follow up of 10 years. Both groups demonstrated statistical significance for most parameters studied. Surgery was superior for weight loss (− 22.05 kg [− 28.86; − 15.23), total cholesterol (− 0.88 [− 1.59; − 0.17]), triglycerides (− 0.70 [− 0.82; − 0.59]), HDL (0.12 [0.02; 0.23]), systolic pressure (− 4.49 [− 7.65; − 1.33]), diastolic pressure (− 2.28 [− 4.25; − 0.31]), Hb glycated (− 0.97 [− 1.31; − 0.62]), HOMA IR (− 2.94; [− 3.52; − 2.35]) and cardiovascular risk (− 0.08; [− 0.10; − 0.05]). Patient in the surgical treatment group had better long term outcomes when compared to the non-surgical group for most clinical parameters.

24 March 2017 in Surgical Endoscopy
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FSFábio Yuji Suguita
Fábio Yuji Suguita
FEFelipe Futema Essu
Felipe Futema Essu
LOLucas Torres Oliveira
Lucas Torres Oliveira
LILeandro Ryuchi Iuamoto
Leandro Ryuchi Iuamoto
JKJuliana Mika Kato
Juliana Mika Kato
WAWellington Andraus
Wellington Andraus

21 August 2020 in PLOS ONE
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Journal Article
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LPLeonardo Zumerkorn Pipek
Leonardo Zumerkorn Pipek
CBCarlos Guilherme Baptista
Carlos Guilherme Baptista
RNRafaela Farias Vidigal Nascimento
Rafaela Farias Vidigal Nascimento
JTJoão Victor Taba
João Victor Taba
MSMilena Oliveira Suzuki
Milena Oliveira Suzuki
WAWellington Andraus
Wellington Andraus
Sarcopenia is defined as the loss of muscle mass combined with loss of muscle strength, with or without loss of muscle performance. The use of this parameter as a risk factor for complications after surgery is not currently used. This meta-analysis aims to assess the impact of sarcopenia defined by radiologically and clinically criteria and its relationship with complications after gastrointestinal surgeries. A review of the literature was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines (PROSPERO registration number: CRD42019132221). Articles were selected from the PUBMED and EMBASE databases that adequately assessed sarcopenia and its impact on postoperative complications in gastrointestinal surgery patients. Pooled estimates of pre-operative outcome data were calculated using the odds ratio (OR) and 95% confidence interval (CI). Subgroup analysis were performed to assess each type of surgery. The search strategy returned 1323, with 11 studies meeting the inclusion criteria. A total of 4265 patients were analysed. The prevalence of sarcopenia between studies ranged from 6.8% to 35.9%. The meta-analysis showed an OR for complications after surgery of 3.01 (95% CI 2.55–3.55) and an OR of 2.2 (95% CI 1.44–3.36) for hospital readmission (30 days). Sarcopenia, when properly diagnosed, is associated with an increase in late postoperative complications, as well as an increase in the number of postoperative hospital readmissions for various types of gastrointestinal surgery. We believe that any preoperative evaluation should include, in a patient at risk, tests for the diagnosis of sarcopenia and appropriate procedures to reduce its impact on the patient’s health.

13 July 2021 in Nutrients
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Journal Article
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JTJoão Victor Taba
João Victor Taba
MSMilena Oliveira Suzuki
Milena Oliveira Suzuki
FNFernanda Sayuri Do Nascimento
Fernanda Sayuri Do Nascimento
Leandro IuamotoLeandro Iuamoto
Leandro Iuamoto
WHWu Tu Hsing
Wu Tu Hsing
WAWellington Andraus
Wellington Andraus
Background: Patients in the postoperative period following bariatric surgery are at risk of developing eating disorders. This study aims to analyze the relation between bariatric surgery and the development and recurrence of eating disorders. Material and methods: A literature review was carried out on 15 November 2020. Fourteen studies that met the eligibility criteria were included for qualitative synthesis, and 7 studies for meta-analysis. Results: The prevalence of eating disorders in the postoperative period was 7.83%, based on the 7 studies in the meta-analysis. Binge eating disorder alone was 3.81%, which was the most significant factor, and addressed in 6 of these studies. Conclusion: The investigated studies have significant methodological limitations in assessing the relation between bariatric surgery and eating disorders, since they mostly present data on prevalence. PROSPERO CRD42019135614.

1 February 2013 in Revista do Colégio Brasileiro de Cirurgiões
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Alberto MeyerAlberto Meyer
Alberto Meyer
PBPierre Blanc
Pierre Blanc
JBJean Gabriel Balique
Jean Gabriel Balique
MKMasaya Kitamura
Masaya Kitamura
RJRamon Trullenque Juan
Ramon Trullenque Juan
JAJérôme Atger
Jérôme Atger
OBJETIVO: identificar e avaliar as complicações do tratamento da hérnia inguinal com a colocação de tela totalmente extraperitoneal. MÉTODOS: Foram incluídos, em uma série consecutiva de 4565 reparos de hérnia laparoscópica, pacientes que haviam sido submetidos ao procedimento TEP entre janeiro de 2001 e janeiro de 2011. Os critérios de inclusão foram: diagnóstico com hérnia inguinal sintomática, incluindo recorrência após correção de hérnia inguinal e cirurgia prévia em abdômen inferior e pelve. Todos os pacientes > 18 anos de idade. Pacientes com hérnia encarcerada na urgência foram excluídos do estudo. RESULTADOS: Um total de 4565 hérnias foram incluídas no estudo. Ocorreram 27 complicações graves (0,6%): 12 hemorragias (0,25%), duas lesões da bexiga (0,04%), cinco oclusões (0,11%), quatro perfurações intestinais (0,09%), uma lesão da veia ilíaca (0,02%), uma lesão do nervo femoral (0,02%), duas lesões dos vasos deferentes (0,04%) e dois óbitos (0,02%) (embolia pulmonar, peritonite). CONCLUSÃO: A taxa de complicações com o procedimento TEP é baixa. Correção de hérnia laparoscópica é uma técnica reprodutível e confiável. Em nossa experiência, existem contraindicações para o procedimento de TEP. A técnica TEP deve ser minuciosa para evitar complicações intraoperatórias (diatermia bipolar). As complicações podem ocorrer mesmo após o cirurgião ter adquirido experiência substancial.

1 September 2007 in Arquivos de Gastroenterologia
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Alberto MeyerAlberto Meyer
Alberto Meyer
EBEduardo Berger
Eduardo Berger
OJOrlando Monteiro Jr.
Orlando Monteiro Jr.
PAPaulino Alberto Alonso
Paulino Alberto Alonso
JSJoão Norberto Stavale
João Norberto Stavale
MGMarcelo Paulo Serafim Gonçalves
Marcelo Paulo Serafim Gonçalves
BACKGROUND: Inguinal hernia is the second most common surgical case in our field. The anatomical factors alone are not enough to explain the inguinal hernia. Studies show changes in the proportion and quantity of collagen fibers in the developing of inguinal hernia. The greater production of collagen type III compared to the type I could justify the thinning of the fascia transversalis and its weakness. AIM: To determine the quantitative and qualitative changes of collagen in the fascia transversalis in inguinal hernia patients and compare them to findings from corpses without inguinal hernia. METHOD: Prospective case-control study based on the biopsy of fascia transversalis of 27 patients and 24 corpses. The technique used was hematoxylin-eosin and picrosirius colorimetry. RESULTS: The medium percent area of collagen (types I + III) and collagen type I, in both groups, show no statistic difference. The quantity of collagen type III was greater in the patients. Patients classified with Nyhus IIIa presented greater quantity of collagen type III. CONCLUSION: There is no significant difference in the quantity of collagen in the fascia transversalis of patients compared to the controls. An increase in the quantity of collagen type III was found in patients with inguinal hernia and a greater quantity in those patients classified with Nyhus IIIa.