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Anemia andGI Bleed
Anemia in the postbariatric patient can be from iron or vitamin
B12 deciency. GI bleeding can also contribute to anemia and
should be evaluated with endoscopy. Bleeding from the staple
tines occurs in 1–4% of patients undergoing any stapled bariatric
surgery [71]. The excluded stomach and the Roux limb lumens
should also be visually inspected, although access to both may be
challenging. Endoscopy or enteroscopy may need to be used [72].
A surgical gastrostomy may be needed for unsuccessful attempts
at accessing the excluded stomach [73].
Endoscopic Retrograde Cholangiopancreatography
(ERCP) After RYGB
Performing an ERCP in a post-RYGB patient presents a unique
set of challenges. A standard endoscope cannot traverse the entire
length of a Roux limb and thus cannot reach the duodenal papillae
[74]. Choledocholithiasis can be diagnosed through nonendoscopic modalities such as MRCP or percutaneous transhepatic cholangiography. There have been case reports of successful
ERCPs using colonoscopes, double-balloon enteroscopy, single
balloon enteroscopy, and spiral-assisted enteroscopy [75–77].
Minimally invasive laparoscopic transgastric ERCP can be performed as well, with success rates greater than with enteroscopy
alone [78–80]. Retrograde ERCP can also be performed through
an enterotomy in the Roux limb [81].
Conclusion
Upper gastrointestinal endoscopy is an essential tool in the diagnosis and treatment of bariatric surgery patients. Preoperatively
endoscopy is used to evaluate pathology that may alter the surgical planning, yet routine and liberal use remains a subject of
debate. Intraoperatively, endoscopy could be used with the proper
indication and concerns to address any technical matters or complications promptly. Endoscopy might require expert skills when

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S. El Djouzi
it comes to managing postoperative complications. As technology
evolves, gastrointestinal endoscopy will likely gain an even more
prominent role in the care of the bariatric patient.
Editors’ Note
See Figs.16.1, 16.2, 16.3, and 16.4.
Fig. 16.1 Endoscopic views in a patient after Roux-en-Y gastric bypass.
Important factors to note include the length of the pouch, the size of the outlet
of the pouch (in scope diameters), and the presence/absence of a hiatal hernia.
The LES can also be examined to subjectively determine whether it is patulous. Finally, the scope should be passed as distally as possible in the roux
limb to determine length (if the jejunojejunostomy can be reached) and there
should be no bile in the roux limb

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Fig. 16.2 Another patient’s upper endoscopy after a gastric bypass. This
patient had a hiatal hernia, a normal outlet size at the gastrojejunostomy.
However, the roux limb was noted to be short at 50cm and bile seen at the
jejunojejunostomy as expected

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b
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Fig. 16.3 Endoscopy after a gastric banding. The size of the pouch is very
important from the gastroesophageal junction to the band. An excessive
amount of stomach above the band is considered a slip. Also, a retroexed
view beyond the band can be helpful to identify erosions. (a) Retroexed
view showing band in place with no erosion. (b) Food in esophagus after band
placed suggesting band to tight. Band in place with no erosion

a
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b
Fig. 16.4 Endoscopy after vertical sleeve gastrectomy. (a) The sleeve should
be tubular proximally and have a reasonable view through the incisura into
the distal stomach where the staple line ends 5–7cm proximal to the pylorus.
Retroexion in the distal stomach shows an open incisura as in panel 12.
Retroexion in the proximal stomach can be difcult in tighter sleeves. (b). In
panel 7, the incisura tightly holds the scope on retroexion. This is an undesirable nding on endoscopy in a sleeve. In panels 14 and 15, one can see a
hiatal hernia and patulous LES, which can contribute to reux after a sleeve
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