He graduated in medicine from the University of São Paulo (1984) and has a PhD in Surgery from the University of São Paulo (1998). He is currently a surgeon at the Hospital das Clínicas of the Faculty of Medicine of the University of São Paulo, where he is an assistant physician in Trauma Surgery and a collaborating professor in Surgical Technique at FMUSP. His lines of research include bariatric surgery and laparoscopy, obesity surgery and laparoscopy, diabetes surgery, sleeve gastrectomy and emergency laparoscopy. He is the organizer and coordinator of the Bariatric Endoscopic Surgery Trends (BEST) course, held annually in Brazil and internationally in Portugal. He was vice-president of the Brazilian Society of Bariatric Surgery (SBCB) and a founding member of the Brazilian Society of Laparoscopic Surgery (SOBRACIL).
Selected publications from PubMed
SADI-S Versus Distal OATB (SASI): Does the Duodenal Pathway Matter in Ileal-Level Single-Anastomosis Surgery?
Noel P, Madalosso CAS, de Melo PRRE, Santoro S, Jacobs M, Kawahara NT, Dib VRM
J Laparoendosc Adv Surg Tech A. 2026 Sep;36(9):641-649 doi: 10.1177/10926429261449961.
Long-Term Outcome of Isolated Duodenal Transit Bipartition as Initial Metabolic Surgery: A 19-Year Follow-Up Case Report.
de Melo PRRE, Dib VRM, Madalosso CAS, d'Almeida LAV, de Godoy EP, Chaim EA, de Aquino CGG, Ribeiro RJS, Madalosso CA, Okano Júnior H, Baretta GAP, Kruel NT, Waltrick Junior JJ, Kfouri DS, Dos Santos FAI, Kawahara NT, Abaid RA, de Barros F, Frota Dillenburg C, Sampaio Neto JGM, da Costa RAMB, Goyano GSR, Melo FRE, Braga TC, Caiña DO, Noel P, Yunus TE, Parmar C, Zorron R, Teixeira A, Galvao Neto M, Ramos AC, Torres A
Am J Case Rep. 2026 Jan 12;27:e950650 doi: 10.12659/AJCR.950650.
Gastric Bipartition with Functional Duodenum Exclusion (GBp-FDE) as a Possible Surgical Conversion of Sleeve Gastrectomy in Patients with De Novo GERD and Obesity Recidivism: Preliminary Results of a Case Series.
Dib VRM, Madalosso CAS, De Melo PRRE, Ramos AC, D'Almeida LAV, Antozzi L, Balibrea Del Castillo JM, Noel P, Galvão Neto MP, Chiappetta S, de Barros F, Teixeira A, Chaim EA, Zorron R, de Godoy EP, de Aquino CGG, Baretta GAP, Kfouri DS, Okano Júnior H, Kawahara NT, Tinoco ACA, Kruel NT, Waltrick Junior JJ, Frota Dillenburg C, Dos Santos FAI, Abaid RA, Da Costa CEA, Scortegagna GT, Silva GF, Taskin HE, Nassar RM, Layani LA, Caiña DO, Avalos MA, Bravo Lópes J, Sotelo JSV, Vilallonga Puy R, Stier CK, Domene CE, Volpe P, García Ruiz de Gordejuela A, Poggi L, Torres A, Carbajo MÁ, Braghetto I, Ribeiro R, Parmar C
Am J Case Rep. 2025 Nov 27;26:e950798 doi: 10.12659/AJCR.950798.
Effect of COVID-19 pandemic on global Bariatric surgery PRActiceS - The COBRAS study.
Singhal R, Tahrani AA, Sakran N, Herrera M, Menon V, Khaitan M, Foschi D, Super J, Sandvik J, Angrisani L, Kawahara N, Teixeira J, Campos GM, Kothari S, Graham Y, Ludwig C, Mahawar K
Obes Res Clin Pract. 2021 Jul-Aug;15(4):395-401 doi: 10.1016/j.orcp.2021.04.005.
Does weight gain, throughout 15 years follow-up after Nissen laparoscopic fundoplication, compromise reflux symptoms control?
Dib VRM, Ramos AC, Kawahara NT, Campos JM, Marchesini JC, Galvão-Neto M, Guimarães AGDP, Picanço-Junior AP, Domene CE
Arq Bras Cir Dig. 2020;33(1):e1488 doi: 10.1590/0102-672020190001e1488.
The duodenal switch was described in 1998. Its popularity increased after Michel Gagner's first laparoscopic case in 2000. The surgical anatomy of the duodenal switch is much better and appealing for the surgeon. One of the important points of this technique is that it makes it possible to maintain the pylorus. This technique is associated with less restriction than gastric bypass and avoids the dumping syndrome associated with RYGBP. On the other hand, duodenal preservation avoids the calcium and iron deficiencies associated with RYGBP. The main complications of the duodenal bypass are nutritional, using 250 cm as the alimentary limb and 100 cm as the common channel. The hardest part of the surgery is the intestinal part. For this reason, it is important to measure the entire length of the bowel. Dr. Kawahara explains that in his experience 50% of the entire bowel should be used as the alimentary limb and 25% as the common limb". In Dr. Kawahara’s experience a common limb longer than 150 cm is required to avoid malnutrition. Our results show a 100% remission rate in DM2 and any kind of malnutrition at 6 years. Dr. Kawahara advocates for the use of the duodenal switch rather than RYGBP for treatment of sleeve gastrectomy failure. His team now apply this technique with no exclusions and with no malnutrition.
Published
Oct 2018
Robotic bariatric surgery is still an emerging field, with slow but consistent growth. In the last few months, various bariatric centers in Europe have started their practice. With the entry of new robotic devices in the market, prices will definitely drop and new relevant features will be made available to surgeons. Current possible advantages are: 1. Steady-surgeon controlled image 2. Tremor filtration 3. Wristed instruments with intuitive motion 4. More precise dissection 5. Easier and safer suturing These can translate into safer anastomosis and better performance during complex revision surgery, and could enable more surgeons to perform single-incision bariatric surgery in a wider range of procedures.
With Medtronic
Published
Dec 2017
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