Clinical characteristics of coronavirus disease 2019 in patients undergoing laparoscopic bariatric/metabolic surgery: a nationwide survey in Japan.

Purpose: Bariatric/metabolic surgery has been reported to reduce the incidence of severe coronavirus disease 2019 (COVID-19); however, its ability to reduce risk is controversial. Therefore, this study aimed to elucidate the incidence and severity of COVID-19 in bariatric patients in Japan.

Methods: The first survey of patients infected with COVID-19 after bariatric/metabolic surgery until June 30, 2022, was sent to 83 Japanese institutions. A second survey was conducted in institutions that reported on COVID-19 patients. The severity of COVID-19 was compared between the general population and bariatric patients, and risk factors correlated with severity were also evaluated.

Results: Twenty-six institutions (31.3%) reported 119 patients with COVID-19 after laparoscopic bariatric/metabolic surgery. There were no severe cases or deaths; however, moderate COVID-19 (pneumonia) was significantly more common in bariatric patients than in the general population (11.4% vs. 1.3%). The risk factors for moderate COVID-19 in bariatric patients included incurable dyslipidemia and infection before the 6th wave of the pandemic.

Conclusion: In Japan, the number of moderate COVID-19 cases may be higher in bariatric patients than in the general population. This study did not show that bariatric/metabolic surgery reduces the risk of COVID-19 complications.