Lactulose Breath Testing Can Be a Positive Predictor Before Weight Gain in Participants with Obesity Submitted to Roux-en-Y Gastric Bypass

Abstract

Background

Small intestinal bacterial overgrowth (SIBO) is defined as the colonization of fermentative bacteria in the duodenum and jejunum. The alteration of digestive anatomy promoted by bariatric surgery may be a pre-disposing factor for SIBO. In this context, the prevalence of SIBO in participants undergoing bariatric surgery using Roux-en-Y gastric bypass (BGYR) was evaluated.

Methods

Participants, both sexes, older than 18 years, were those who (a) had bariatric surgery by the BGYR technique at least 1 year before the data collection and (b) did not use antibiotics recently. The SIBO diagnosis was established through the hydrogen breath test (H2BT), with intake of lactulose and serial collection of breath samples over 2 h. A test with ≥ 12-point elevation over the basal sample at 60 min after substrate intake was deemed positive.

Results

A total of 18 participants (14 females (77.8%)) were enrolled with a mean age of 50.5 years (range, 23 to 79 years). The interval between surgery and data collection ranged from 5 to 20 years (mean, 11.2 years). The mean preoperative body mass index (BMI) was 44.6 kg/m2 (range, 36.7–56.2 kg/m2). The H2RT with lactulose was positive for SIBO in seven (six female) participants. The participants with negative test measured trough H2BT with lactulose had a lower mean BMI of 28.69 kg/m2, in comparison with the positive group, which presented a mean BMI of 33.04 kg/m2 (p value = 0.041).

Conclusion

Our data point to a high prevalence of SIBO (38.8%) in patients undergoing BGYR with a value in accordance with the literature. Moreover, the differences in BMI between negative and positive groups by H2BT with lactulose evidenced a weight gain relapse in participants with SIBO.

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All authors have approved the manuscript and agreed with its submission. Moreover, LKC, NSC, TNR, and PJCC idealized the project; collected patients’ data; worked on supervision, realization, and validation based on repeatability of the exams; contribute with the safety analysis; conducted the writing and critical review of the study; FALM conducted the writing and critical review of the study, also, performed the statistical analysis of the data. All authors have contributed to manuscript writing.

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Correspondence to Tomas Navarro-Rodriguez.

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The project was approved by the research ethics committee from the institution.

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Coelho, L.K., Carvalho, N.S., Navarro-Rodriguez, T. et al. Lactulose Breath Testing Can Be a Positive Predictor Before Weight Gain in Participants with Obesity Submitted to Roux-en-Y Gastric Bypass. OBES SURG 29, 3457–3464 (2019). https://doi.org/10.1007/s11695-019-04006-z

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Keywords

  • Bacterial overgrowth
  • Bariatric surgery
  • Breath test
  • Lactulose
  • Obesity
  • Small intestine