A proper revision from RNY to DS is an extremely difficult and somewhat risky surgery, with frequent complications - but to most people, worth it in the long run. If by doing just the intestinal part (which really isn't the same thing at all) you mean going from a proximal or medial RNY to a distal or ERNY, what you end up with is the worst of both worlds - the RNY pouch with all its problems, and significant malabsorption with even worse risks of malnutrition, because you don't have the more comfortable VSG, with essentially no limits on the type and texture of foods you can eat - just volume - along with still having a stoma, dumping, no pylorus, no duodenum in the alimentary tract - an unacceptable outcome for many.
A PROPER DS revision involves (ASSUMING the pyloric valve has not atrophied by disuse!) taking down the stoma; putting the transected stomach back together (or removing the staples); and then doing the VSG on the reconstructed restitched stomach; putting the intestine back together andrecutting partitioning the duodenum, reconstructing the intestines into the right configuration; putting the Y anastomosis in the right place - it is a horrendously difficult surgery. There are only a handful of surgeons in the US qualified to do it. Which is why we say:
THINK TWICE, CUT ONCE!
A PROPER DS revision involves (ASSUMING the pyloric valve has not atrophied by disuse!) taking down the stoma; putting the transected stomach back together (or removing the staples); and then doing the VSG on the reconstructed restitched stomach; putting the intestine back together and
THINK TWICE, CUT ONCE!
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