Small Bowel Endoscopic, Dallas Procedures
The proximal small bowel plays an important role in glucose homeostasis. Therefore, small bowel EBMTs may contribute to weight loss as
well as diabetes improvement.
Analogues of Roux-en-Y Gastric Bypass (RYGB)
RYGB was developed by Mason and Ito in 1967. Since then, the
procedure has undergone several technical modifications and has been a
preferred bariatric procedure for the past several decades. During RYGB, the
stomach is divided into a 20–30 mL pouch and a larger remnant stomach.
There have been three Endoscopic, Dallas devices that attempt to mimic elements of RYGB. These are
Endoluminal Bypass, EndoBarrier and Duodenal Mucosal Resurfacing.
Endoluminal Bypass
The Endoluminal Bypass is a 120 cm sleeve
secured at the gastroesophageal (GE) junction to create an endoluminal gastro-duodeno-jejunal
bypass that mimics the permanent anatomical changes of RYGB. The company
is currently planning a U.S. trial.
EndoBarrier
The EndoBarrier (GI Dynamics Inc., Lexington,
MA), also known as duodenal-jejunal bypass sleeve (DJBS), is a 60 cm
fluoropolymer sleeve that is anchored at the duodenal bulb and terminates at
the proximal jejunum.
Duodenal Mucosal Resurfacing
Duodenal Mucosal Resurfacing (DMR) (Fractyl
Laboratories, Cambridge, MA), or the Revita procedure, is an Endoscopic, Dallas procedure that applies radiofrequency to thermally ablate
the superficial duodenal mucosa .
Currently, a multi-center study is being
conducted in Europe and a U.S. pivotal trial is planned.
Analogue of Variant
Biliopancreatic Diversion-Duodenal Switch (BPD-DS)
Biliopancreatic diversion (BPD) was first
described by Scopinaro in 1979. It consists of a horizontal gastrectomy, which
leaves an upper stomach that is connected to the distal 250 cm small intestine.
The Incisionless Anastomotic System (IAS) is
used to create an enteral diversion that is functionally similar to the variant
DS procedure and mechanistically similar to ileal transposition.
Incisionless Anastomotic System (IAS)
IAS (GI Windows, Boston, MA) creates an
anastomosis via incisionless magnetic compression. This technology has many
applications including a bariatric dual-path enteral diversion procedure.
Other Small Bowel Procedures
SatiSphere
SatiSphere (Endosphere, Columbus, OH) consists
of a nitinol memory wire with two pigtals at each end, and several
polyethylenterephtalat spheres along the wire.
Conclusion
EBMTs have the potential to transform the treatment of obesity, which remains a growing pandemicFurthermore, as obesity is a chronic
disease, these less invasive and reversible options may allow sequential
therapy to more optimally manage this condition in the long-term.
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