Mortality after bariatric surgery: findings from a 7-year multicenter cohort study

Comparative Analysis of Mortality Rates among Morbidly Obese Individuals: A Study of Patients Undergoing Bariatric Surgery, Nonsurgical Morbidly Obese Individuals, and the General Population

INTRODUCTION

Mortality decreases following bariatric surgery. We explored the extent of the reduction and whether or not it reaches the general population level in a large cohort of patients with obesity. This study aimed to compare all-cause mortality between patients with obesity who undergo bariatric surgery and those who do not, with the general Iranian population during the same period.

METHOD

Data from Iran's National Obesity Surgery Database were used to establish a large cohort of patients registered between 2009 and 2019. The current vital status of the patients was determined by utilizing post-surgery follow-up data for those who underwent the operation. For patients without a surgery record, a predefined checklist was filled out through telephone interviews. Death data from the National General Registrar's office were obtained for all cohort members.

RESULTS

Of 13,313 cohort members, 12,915 were eligible for analysis. The median age at the first visit was 38 years, and 78% were women. 6,190 patients (47.9%) underwent bariatric surgery, and 6,725 patients (52.1%) were not yet operated on at the time of analysis. We observed 139 deaths during 53,880 person-years follow-ups. The median follow-ups for operated-on and not operated-on groups were 4 and 4.8 years. The mortality rates among nonoperated patients were 2.89 times higher (standardized mortality ratio [SMR] = 2.89, 95% CI: 2.36-3.53) than those in the general population, while in operated patients, the mortality rate decreased to 1.82 as high (SMR = 1.82, 95% CI: 1.34-2.46).

CONCLUSION

The risk of death has been diminished in the operated-on group. It still remains considerably higher than the risk in the general population.

Long-term all-cause and cause-specific mortality for four bariatric surgery procedures

OBJECTIVE

This retrospective study incorporated long-term mortality results after different bariatric surgery procedures and for multiple age at surgery groups.

METHODS

Participants with bariatric surgery (surgery) and without (non-surgery) were matched (1:1) for age, sex, BMI, and surgery date with a driver license application/renewal date. Mortality rates were compared by Cox regression, stratified by sex, surgery type, and age at surgery.

RESULTS

Participants included 21,837 matched surgery and non-surgery pairs. Follow-up was up to 40 years (mean [SD], 13.2 [9.5] years). All-cause mortality was 16% lower in surgery compared with non-surgery groups (hazard ratio, 0.84; 95% CI: 0.79-0.90; p < 0.001). Significantly lower mortality after bariatric surgery was observed for both females and males. Mortality after surgery versus non-surgery decreased significantly by 29%, 43%, and 72% for cardiovascular disease, cancer, and diabetes, respectively. The hazard ratio for suicide was 2.4 times higher in surgery compared with non-surgery participants (95% CI: 1.57-3.68; p < 0.001), primarily in participants with ages at surgery between 18 and 34 years.

CONCLUSIONS

Reduced all-cause mortality was durable for multiple decades, for multiple bariatric surgical procedures, for females and males, and for greater than age 34 years at surgery. Rate of death from suicide was significantly higher in surgery versus non-surgery participants only in the youngest age at surgery participants.

Gastrojejunocolic fistula: case report of a rare late complication of laparoscopic Roux-en-Y gastric bypass and review of the literature

Introduction

Laparoscopic Roux-en-Y gastric bypass (LRYGB) is known as the weight loss surgery to which other bariatric procedures are compared. While morbidity and mortality of this procedure are low, serious complications do exist which can be life-threatening and sometimes require surgical correction.

Case presentation

A 63-year-old woman underwent LRYGB outside of the United States, later complicated by biliary colic treated with cholecystectomy and upper gastrointestinal bleeding secondary to H. pylori-related ulcer at her gastrojejunostomy. Following adequate treatment of the patients marginal ulcer, the patient experienced several months of progressive severe abdominal pain, frequent vomiting and diarrhea, and unintentional weight loss refractory to pharmacologic therapy. The patient underwent multiple medical and endoscopic evaluations unrevealing of an organic cause of her symptoms. At presentation, the patient was found to be profoundly weak, dehydrated and malnourished with metabolic derangements and was subsequently diagnosed with a gastrojejunocolic fistula via upper endoscopy and radiography. We provided excluded stomach gastrostomy tube feeding to the patient for three months to improve the patients nutritional status before definitive surgical correction was successfully performed.

Discussion

Large bowel fistulas are a rare and highly morbid late complication following LRYGB and are likely secondary to marginal ulcers and/or instrumentation such as endoscopy. Surgery represents the definitive treatment.

Conclusion

LRYGB is typically a safe and effective intervention for obesity. Large bowel fistulas are rare complications following this surgery. We highlight difficulties in diagnosing and treating this condition.

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Morbidity and mortality of bariatric surgery have decreased since 1990s.

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Large bowel fistulas are a rare, highly morbid complication after gastric bypass.

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Important to optimize patient nutrition before correction of colonic fistulas

Differential Outcomes and Clinical Challenges of NAFLD With Extreme Obesity

Nonalcoholic fatty liver disease (NAFLD) is closely associated with obesity. The prevalence of extreme obesity, defined as body mass index (BMI) of 50 kg/m² or higher, is rising more rapidly than overall obesity. We aimed to compare the clinical outcomes and performance of noninvasive fibrosis assessment tools in NAFLD with or without extreme obesity. A retrospective analysis was performed in 304 patients with NAFLD with extreme obesity and compared them to patients with NAFLD with BMI of 40 kg/m² or less, matched for age, gender, race, and liver fibrosis stage. The mean age of the NAFLD with extreme obesity cohort was 55.9 years, BMI 55 kg/m², and 49.7% had cirrhosis at initial evaluation. Baseline cirrhosis and coronary artery disease were associated with increased risk of death, and dyslipidemia with decreased risk of mortality. Age, insulin use, hypertension, albumin and platelet count were associated with cirrhosis. Fifteen percent of patients had weight‐loss surgery, but this was not associated with survival or risk of cirrhosis. Of the 850 abdominal ultrasound scans performed in 255 patients, 24.1% were deemed suboptimal for hepatocellular carcinoma screening. The mean NAFLD fibrosis score (NFS) in the extreme obesity cohort, versus a propensity‐matched cohort with BMI of 40 kg/m² or less, was significantly different for both low fibrosis (F0‐F2) (0.222 vs. −1.682, P < 0.0001) and high fibrosis (F3‐F4) (2.216 vs. 0.557, P < 0.001). Conclusion: NAFLD with extreme obesity is associated with increased risk of liver‐related and overall mortality. Accurate noninvasive assessment of liver fibrosis, low rates of weight loss surgery, and high failure rate of ultrasound were identified as clinical challenges in this population.