A recent population-based cohort study (JH Kauppila et al. Gastroenterol 2019; 157: 19-27) examined the effects of bariatric surgery on survival from Nordic countries between 1980-2012.
Among 505,258 obese individuals, 49,977 had bariatric surgery.
- Overall mortality rates were lower in the surgery group during the first 14 years but higher after 15 years (HR 1.20 with CI 1.02-1.42). Thus, overall, obese patients who underwent bariatric surgery had longer survival times than obese patients who did not have surgery. Both groups had higher mortality than the general population
- The improved survival compared to those without surgery was related to decreased mortality from cardiovascular mortality, diabetes and cancer. However mortality due to suicide was increased.
- Limitations: lack of detailed data including BMI, smoking and alcohol consumption
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