Roux-en-Y anastomosis

In general surgery, a Roux-en-Y anastomosis, or Roux-en-Y, is an end-to-side surgical anastomosis of bowel used to reconstruct the gastrointestinal tract. Typically, it is between stomach and small bowel that is distal (or further down the gastrointestinal tract) from the cut end.[1]

Roux-en-Y anastomosis
Schematic of gastric bypass using a Roux-en-Y anastomosis. The transverse colon is not shown so that the Roux-en-Y can be clearly seen. The variant seen in this image is retrocolic, retrogastric, because the distal small bowel that joins the proximal segment of stomach is behind the transverse colon and stomach.
Other namesRoux-en-Y

Overview

The name is derived from the surgeon who first described it (César Roux)[1] and the stick-figure representation. Diagrammatically, the Roux-en-Y anastomosis looks a little like the letter Y.

Typically, the two upper limbs of the Y represent (1) the proximal segment of stomach and the distal small bowel it joins with and (2) the blind end that is surgically divided off, and the lower part of the Y is formed by the distal small bowel beyond the anastomosis.

Roux-en-Ys are used in several operations and collectively called Roux operations.[1]

When describing the surgery, the Roux limb is the efferent or antegrade limb that serves as the primary recipient of food after the surgery, while the hepatobiliary or afferent limb that anastomoses with the biliary system serves as the recipient for biliary secretions, which then travel through the excluded small bowel to the distal anastomosis at the mid jejunum to aid digestion. The altered anatomy can contribute to indigestion following surgery.[2] The procedure has also been associated with an increased incidence of iron deficiency anemia. Iron deficiency anemia develops in up to 45% of people who have had a Roux-en-Y anastamosis.[3]

Operations that make use of a Roux-en-Y
gollark: It would have been much more sensible to use 1LC/2LC/3LC but noooo...
gollark: TLC does three bits a cell, so you get 2³ = 8 voltage levels, etc. - you trade off endurance and speed for density.
gollark: The issue with it is that the flash memory wears down in some way after a bunch of program/erase cycles, so it has trouble reading/writing accurately or something, and this is a greater problem for MLC than SLC because it has to read finer gradations.
gollark: I mean, yes, the naming is weird.
gollark: MLC is two bits a cell, so it has to distinguish *four* voltage levels. This means you get twice the density.

References
  1. Roux operation. whonamedit.com. http://www.whonamedit.com/synd.cfm/3724.html. Accessed on: February 7, 2008.
  2. Björklund, P; Laurenius, A; Een, E; Olbers, T; Lönroth, H; Fändriks, L (2010). "Is the Roux limb a determinant for meal size after gastric bypass surgery?". Obesity Surgery. 20 (10): 1408–14. doi:10.1007/s11695-010-0192-1. PMC 2941084. PMID 20517654.
  3. Longo, Dan L.; Camaschella, Clara (7 May 2015). "Iron-Deficiency Anemia". New England Journal of Medicine. 372 (19): 1832–1843. doi:10.1056/NEJMra1401038.
  4. Surgery to remove stomach cancer. cancerhelp.org.uk. URL: http://www.cancerhelp.org.uk/help/default.asp?page=3917. Accessed on: February 7, 2008.
  5. Lawrence PF. Essentials of general surgery. 3rd Ed. Lippincott Williams & Wilkins. 2000. ISBN 0-683-30133-0.
  6. Shokouh-Amiri H, Zakhary JM, Zibari GB (April 2011). "A novel technique of portal-endocrine and gastric-exocrine drainage in pancreatic transplantation". Journal of the American College of Surgeons. 212 (4): 730–8, discussion 738–9. doi:10.1016/j.jamcollsurg.2010.12.045. PMID 21463823.
  7. Segura-Sampedro, JJ; Jiménez-Rodríguez, RM; Martos-Martínez, JM; Padillo-Ruiz, FJ (December 2012). "[Pancreatic rupture and Roux-en-Y reconstruction after abdominal trauma]". Cirugia Espanola. 90 (10): e39. doi:10.1016/j.ciresp.2011.07.018. PMID 22257412.
  8. van Wagensveld, B. A.; Coene, P. P. L. O.; van Gulik, T. M.; Rauws, E. A. J.; Obertop, H. & Gouma, D. J. (October 1997). "Outcome of palliative biliary and gastric bypass surgery for pancreatic head carcinoma in 126 patients". British Journal of Surgery. 84 (10): 1402–1406. doi:10.1111/j.1365-2168.1997.02799.x. PMID 9361599.
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