الفهرس 
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Abstract
Recently laparoscopic sleeve gastrectomy (LSG) has gained increased popularity both as a primary operation for weight reduction,and as a revisional procedure after failed restrictive barriateric surger.On the other hand, the conversion to laparoscopic Roux-en-Y gastric bypass is a solution with some drawbacks as long operative time and higher complication rates
The purpose of this study is to find an evidence of BMI reduction and/or less surgical complications following revisional surgeries (laparoscopic Roux-en-Y gastric bypass (LRYGB), Mini Gastric Bypass-One Anastomosis Gastric Bypass (MGB-OAGB) and laparoscopic sleeve gastrectomy (LSG)) after failed restrictive bariatric surgeries (vertical banded gastroplasty (VBG) laparoscopic adjustable gastric banding (LAGB)).
Our meta-analysis revealed no significant difference regarding post-operative BMI changes between gastric bypasses (RYGB+MGB) and sleeve gastrectomy, however MGB compared to RYGB had a better decrease of BMI in 24 months, with no significant difference between them regarding the overall analysis. 24, 36 and 48 months post-operative EWL% was lower in sleeve gastrectomy than gastric bypasses, with overall significant better decrease. Conversely, when we compared RYGB to MGB at 12-month post-conversion, there was more EWL% for RYGB, with significant overall difference.