Mohammad Kermansaravi1 & Shahab Shahabi Shahmiri2 & Amir Hossein DavarpanahJazi2 & Rohollah Valizadeh3 &
Giovanna Berardi4 & Antonio Vitiello4 & Mario Musella4 & Miguel Carbajo5
Received: 18 August 2020 /Revised: 19 October 2020 /Accepted: 21 October 2020
# The Author(s) 2020
Abstract
One anastomosis gastric bypass (OAGB/MGB) has gained popularity in the past decade. International databases were searched
for articles published by September 10, 2020, on OAGB/MGB as a revisional procedure after restrictive procedures. Twenty-six
studies examining a total of 1771 patients were included. The mean initial BMI was 45.70 kg/m2, which decreased to 31.52,
31.40, and 30.54 kg/m2 at 1, 3, and 5-year follow-ups, respectively. Remission of type-2 diabetes mellitus (T2DM) following
OAGB/MGB at 1-, 3-, and 5-year follow-up was 65.16 ± 24.43, 65.37 ± 36.07, and 78.10 ± 14.19%, respectively. Remission/
improvement rate fromgastroesophageal reflux disease (GERD). Also, 7.4% of the patients developed de novo GERD following
OAGB/MGB. Leakage was the most common major complication. OAGB/MGB appears to be feasible and effective as a
revisional procedure after failed restrictive bariatric procedures.
Keywords One anastomosis gastric bypass (OAGB/MGB) . Gastric bypass . Weight regain . Weight loss . Conversion
Ali Aminian1 & Mohammad Kermansaravi2 & Shahriar Azizi3 & Peyman Alibeigi4 & Sina Safamanesh5 &
Ali Mousavimaleki2 & Mohammad Taghi Rezaei4 & Maziar Faridi5 & Somayeh Mokhber2 & Abdolreza Pazouki2 &
Saeed Safari6
# Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
There is no data on patients with severe obesity who developed coronavirus disease 2019 (COVID-19) after bariatric surgery.
Four gastric bypass operations, performed in a 2-week period between Feb 24 and March 4, 2020, in Tehran, Iran, were
complicated with COVID-19. The mean age and body mass index were 46 ± 12 years and 49 ± 3 kg/m2. Patients developed
their symptoms (fever, cough, dyspnea, and fatigue) 1, 2, 4, and 14 days after surgery. One patient had unnoticed anosmia 2 days
before surgery. Three patients were readmitted in hospital. All 4 patients were treated with hydroxychloroquine. In two patients
who required admission in intensive care unit, other off-label therapies including antiretroviral and immunosuppressive agents
were also administered. All patients survived. In conclusion, COVID-19 can complicate the postoperative course of patients after
bariatric surgery. Correct diagnosis and management in the postoperative setting would be challenging. Timing of infection after
surgery in our series would raise the possibility of hospital transmission of COVID-19: fromasymptomatic patients at the time of
bariatric surgery to the healthcare workers versus acquiring the COVID-19 infection by non-infected patients in the perioperative
period.
Keywords Bariatric surgery . Gastric bypass . Complications . COVID-19 . Coronavirus . Pneumonia