Weight loss and malnutrition after conversion of the primary Roux-en-Y gastric bypass to distal gastric bypass in patients with morbid obesity

Published:December 17, 2019DOI:


      • Forty-seven patients had revisional surgery from primary gastric bypass to distal gastric bypass (D-RYGB) with an alimentary limb of 250-300 cm and common channel of 100 cm.
      • Total weight loss (TWL) increased significantly from 12% to 30% after D-RYGB and in 62% of patients %TWL>25% was achieved.
      • Nutritional deficiencies were present in 89% of patients after D-RYGB despite the prescription of specialized multivitamins.
      • Five patients (11%) needed subsequent lengthening of the common channel to 250 cm due to protein malnutrition or a debilitating defecation pattern.
      • The results of our study imply that a longer common channel (>200 cm) might be a better option.



      After Roux-en-Y gastric bypass (RYGB), 15% to 35% of patients fail to lose sufficient weight. Distalization of the limbs of the RYGB (D-RYGB) with shortening of the common channel (CC), has been used to induce additional weight loss. However, this may increase the risk of malnutrition.


      The aim of this study was to assess postoperative outcomes after D-RYGB with an alimentary limb of 250 to 300 cm and CC of 100 cm.


      General hospital, specialized in bariatric surgery.


      We retrospectively studied all patients who underwent revision of RYGB to D-RYGB between January 2014 and April 2018. Data were collected from medical records, including weight loss, nutritional deficiencies, and co-morbidities. Questionnaires on defecation pattern, quality of life, and patient satisfaction were obtained.


      Forty-seven patients were included. Total weight loss (%TWL) increased significantly from 12% to 30% after D-RYGB. In 62% of patients %TWL >25% was achieved. Patients with %TWL <25% after primary RYGB, lost significantly more weight than initially reached after RYGB. Diabetes and hypertension remission occurred in 67% and 50%, respectively. Five patients (11%) needed subsequent lengthening of the CC to 250 cm due to protein malnutrition or debilitating defecation patterns. Nutritional deficiencies were present in 89% of patients after D-RYGB despite the prescription of specialized multivitamins.


      Conversion of the primary RYGB to D-RYGB improves weight loss and co-morbidities in patients with insufficient weight loss after primary RYGB. After D-RYGB, nutritional complications and diarrhea are a risk. Based on this study, a modified D-RYGB with a longer CC of >200 cm will be considered.

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