Pancreaticoduodenectomy

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Pancreaticoduodenectomy
Diagram showing how the pancreas and bowel is joined back together after a Whipple's operation CRUK 140.svg
The pancreas, stomach, and bowel are joined back together after a pancreaticoduodenectomy
ICD-9-CM 52.7
MeSH D016577

A pancreaticoduodenectomy, pancreatoduodenectomy,[1] Whipple procedure, or Kausch-Whipple procedure, is a major surgical operation most often performed to remove cancerous tumours of the head of the pancreas.[2] It is also used for the treatment of pancreatic or duodenal trauma, or chronic pancreatitis.[2] Due to the shared blood supply of organs in the proximal gastrointestinal system, surgical removal of the head of the pancreas, also necessitates removal of the duodenum, proximal jejunum, gallbladder, and, occasionally, part of the stomach.[2]

Anatomy involved in the procedure[edit]

The tissue removed during a pancreaticoduodenectomy
Whipple surgery

The most common technique of a pancreaticoduodenectomy consists of the wikt:en bloc removal of the distal segment (antrum) of the stomach, the first and second portions of the duodenum, the head of the pancreas, the common bile duct, and the gallbladder. Lymph nodes in the area are often removed during the operation as well (lymphadenectomy). However, not all lymph nodes are removed in the most common type of pancreaticoduodenectomy because studies showed that patients did not benefit from the more extensive surgery.[3]

At the very beginning of the procedure, after the surgeons have gained access to the abdomen, the surfaces of the peritoneum and the liver are inspected for disease that has metastasized. This is an important first step as the presence of active metastatic disease is a contraindication to performing the operation.

The vascular supply of the pancreas is from the celiac artery via the superior pancreaticoduodenal artery and the superior mesenteric artery from the inferior pancreaticoduodenal artery. There are additional smaller branches given off by the right gastric artery which is also derived from the celiac artery. The reason for the removal of the duodenum along with the head of the pancreas is that they share the same arterial blood supply (the superior pancreaticoduodenal artery and inferior pancreaticoduodenal artery). These arteries run through the head of the pancreas, so that both organs must be removed if the single blood supply is severed. If only the head of the pancreas were removed it would compromise blood flow to the duodenum, resulting in tissue necrosis.

While blood supply to the liver is left intact, the Common bile duct is removed. This means that while the liver remains with a good blood supply the surgeon must make a new connection to drain bile produced in the liver. This is done at the end of the surgery. The surgeon will make a new attachment between the pancreatic duct and the jejunum or stomach. During the surgery a cholecystectomy is performed to remove the gallbladder. This portion is not done en bloc, as the gallbladder is removed separately.

Relevant nearby anatomy not removed during the procedure include the major vascular structures in the area: the portal vein, the superior mesenteric vein, and the superior mesenteric artery, the inferior vena cava. These structures are important to consider in this operation especially if done for resection of a tumor located in the head of the pancreas. If the tumor encases (wraps around 50% or more of the vessel) the celiac artery, superior mesenteric artery, or inferior vena cava it is considered unresectable due to the lack of patient benefit from the operation while having very high risk[4][5]. Occasionally a portion of the superior mesenteric vein or portal vein is attached or inseparable from the tumor. In this setting the involved portion of the vessel is resected, and the vessel repaired either via end-to-end anastomosis, repair of the side wall of the vein, or a vein graft.

Medical indications[edit]

Pancreaticoduodenectomy is most often performed as curative treatment for periampullary cancer, which include cancer of the bile duct, duodenum or head of the pancreas.[6] The shared blood supply of the pancreas, duodenum and common bile duct, necessitates en bloc resection of these multiple structures. Other indications for pancreaticoduodenectomy include chronic pancreatitis, benign tumors of the pancreas, cancer metastatic to the pancreas, and gastrointestinal stromal tumors.[6]

Pancreatic cancer[edit]

Pancreaticoduodenectomy is the only potentially curative intervention for malignant tumors of the pancreas[7]. However, the majority of patients with pancreatic cancer present with metastatic or locally advanced unresectable disease[8]; thus only 15-20% of patients are candidates for the Whipple procedure. Surgery may follow neoadjuvant chemotherapy, which aims to shrink the tumor and increasing the likelihood of complete resection[9]. Post-operative death and complications associated with pancreaticoduodenectomy have become less common over the past 20 years, with rates of post-operative mortality falling from 10-30% in the 1980s, to less than 5% in the 2000s[10].

Cholangiocarcinoma[edit]

Cholangiocarcinoma, or cancer of the bile duct, is an indication for the Whipple procedure when the cancer is present in the distal biliary system, usually the common bile duct that drains into the duodenum. Depending on the location and extension of the cholangiocarcinoma, curative surgical resection may require hepatectomy, or removal of part of the liver, with or without pancreaticoduodenectomy.[11]

Chronic pancreatitis[edit]

Treatment of chronic pancreatitis typically includes pain control and management of exocrine insufficiency. Intractable abdominal pain is the main surgical indication for surgical management of chronic pancreatitis.[12] Removal of the head of the pancreas can relieve pancreatic duct obstruction associated with chronic pancreatitis.[13]

Contraindications[edit]

Absolute contraindications for the procedure are metastatic disease in the abdominal cavity or nearby organs. These are found most often on the peritoneum, in the liver, and in the omentum. In order to determine if there are metastases, surgeons will inspect the abdomen at the beginning of the procedure after gaining access. Alternatively, they may perform a separate procedure called a diagnostic laparoscopy which involves insertion of a small camera through a small incision to look inside the abdomen. This may spare the patient the large abdominal incision that would occur if they were to undergo the initial part of a pancreaticoduodenectomy that was cancelled due to metastatic disease.

Further contraindications include encasement of major vessels (such as celiac artery, inferior vena cava, or superior mesenteric artery) as mentioned above.

Surgical considerations[edit]

Versus total pancreatectomy[edit]

Clinical trials have failed to demonstrate significant survival benefits of total pancreatectomy, mostly because patients who submit to this operation tend to develop a particularly severe form of diabetes mellitus called brittle diabetes. Sometimes the pancreaticojejunostomy may not hold properly after the completion of the operation and infection may spread inside the patient. This may lead to another operation shortly thereafter in which the remainder of the pancreas (and sometimes the spleen) is removed to prevent further spread of infection and possible morbidity.

Pylorus-sparing pancreaticoduodenectomy[edit]

In recent years the pylorus-preserving pancreaticoduodenectomy (also known as Traverso-Longmire procedure/PPPD) has been gaining popularity, especially among European surgeons. The main advantage of this technique is that the pylorus, and thus normal gastric emptying, should in theory be preserved.[14] A recent meta-analysis included 27 studies with a total of 2,599 patients. The results showed that pylorus removal of pancreaticoduodenectomy doesn't significantly prevent delayed gastric emptying[15]. A more recent meta-analysis suggests that pylorus-preserving pancreaticoduodenectomy may have an increased likelihood of delayed gastric emptying [16] However, some doubts remain on whether it is an adequate operation from an oncological point of view. In practice, it shows similar long-term survival as a Whipple's (pancreaticoduodenectomy + hemigastrectomy), but patients benefit from improved recovery of weight after a PPPD, so this should be performed when the tumour does not involve the stomach and the lymph nodes along the gastric curvatures are not enlarged.[17]

Compared to the standard Whipple procedure, the pylorus preserving pancreaticoduodenectomy technique is associated with shorter operation time and less intraoperative blood loss, requiring less blood transfusion. Post-operative complications, hospital mortality and survival do not differ between the two methods.[18][19][20]

Morbidity and mortality[edit]

Pancreaticoduodenectomy is considered, by any standard, to be a major surgical procedure.

Many studies have shown that hospitals where a given operation is performed more frequently have better overall results (especially in the case of more complex procedures, such as pancreaticoduodenectomy). A frequently cited study published in The New England Journal of Medicine found operative mortality rates to be four times higher (16.3 v. 3.8%) at low-volume (averaging less than one pancreaticoduodenectomy per year) hospitals than at high-volume (16 or more per year) hospitals. Even at high-volume hospitals, morbidity has been found to vary by a factor of almost four depending on the number of times the surgeon has previously performed the procedure.[21] de Wilde et al. have reported statistically significant mortality reductions concurrent with centralization of the procedure in the Netherlands.[22]

One study reported actual risk to be 2.4 times greater than the risk reported in the medical literature, with additional variation by type of institution.[23]

Postoperative complications[edit]

Three of the most common post-operative complications are: delayed gastric emptying, bile leak, and pancreatic leak. Delayed gastric emptying, normally defined as an inability to tolerate a regular diet by the end of the first post-op week and the requirement for nasogastric tube placement, occurs in approximately 17% of operations[24][25]. During the surgery, a new biliary connection (normally a choledochal-jejunal anastamosis connecting the common bile duct and jejunum) is made. This new connection may leak in 1-2% of operations. As this complication is fairly common, it is normal in this procedure for the surgeon to leave a drain in place at the end. This allows for detection of a bile leak via elevated bilirubin in the fluid drained. Pancreatic leak or pancreatic fistula, defined as fluid drained after postoperative day 3 that has an amylase content greater than or equal to 3 times the upper limit of normal, occurs in 5-10% of operations[26][27].

History[edit]

This procedure was originally described by Alessandro Codivilla, an Italian surgeon, in 1898. The first resection for a periampullary cancer was performed by the German surgeon Walther Kausch in 1909 and described by him in 1912. It is often called Whipple's procedure or the Whipple procedure, after the American surgeon Allen Whipple who devised an improved version of the surgery in 1935[28] and subsequently came up with multiple refinements to his technique.

Nomenclature[edit]

Fingerhut et al. argue that while the terms pancreatoduodenectomy and pancreaticoduodenectomy are often used interchangeably in the medical literature, scrutinizing their etymology yields different definitions for the two terms.[1] As a result, the authors prefer pancreatoduodenectomy over pancreaticoduodenectomy for the name of this procedure.[1]

See also[edit]

References[edit]

  1. ^ a b c [clarification needed]Fingerhut, A; Vassiliu, P; Dervenis, C; Alexakis, N; Leandros, E (2007). "What is in a word: Pancreatoduodenectomy or pancreaticoduodenectomy?". Surgery. 142 (3): 428–9. doi:10.1016/j.surg.2007.06.002. PMID 17723902. 
  2. ^ a b c Reber, Howard (24 October 2016). "Surgical resection of lesions of the head of the pancreas". UpToDate. Retrieved 12 March 2017. (Subscription required (help)). 
  3. ^ Sun, J; Yang, Y; Wang, X; Yu, Z; Zhang, T; Song, J; Zhao, H; Wen, J; Du, Y; Lau, WY; Zhang, Y (October 2014). "Meta-analysis of the efficacies of extended and standard pancreatoduodenectomy for ductal adenocarcinoma of the head of the pancreas". World J Surg. 38 (10): 2708–15. PMID 24912627. 
  4. ^ "Pancreatic Cancer Stages". Cancer.org. American Cancer Society. Retrieved 13 December 2017. 
  5. ^ "Pancreas Cancer Staging" (PDF). Cancer Staging. American Joint Committee on Cancer. Retrieved 13 December 2017. 
  6. ^ a b Cameron, John L.; Riall, Taylor S.; Coleman, JoAnn; Belcher, Kenneth A. (July 2006). "One thousand consecutive pancreaticoduodenectomies". Annals of Surgery. 244 (1): 10–15. doi:10.1097/01.sla.0000217673.04165.ea. ISSN 0003-4932. PMC 1570590Freely accessible. PMID 16794383. 
  7. ^ Clancy, Thomas E. (August 2015). "Surgery for Pancreatic Cancer". Hematology/Oncology Clinics of North America. 29 (4): 701–716. doi:10.1016/j.hoc.2015.04.001. ISSN 1558-1977. PMID 26226905. 
  8. ^ O Kane, Grainne M.; Knox, Jennifer J. (2017-11-16). "Locally advanced pancreatic cancer: An emerging entity". Current Problems in Cancer. doi:10.1016/j.currproblcancer.2017.10.006. ISSN 1535-6345. PMID 29153290. 
  9. ^ Wolff, Robert A. (February 2018). "Adjuvant or Neoadjuvant Therapy in the Treatment in Pancreatic Malignancies: Where Are We?". The Surgical Clinics of North America. 98 (1): 95–111. doi:10.1016/j.suc.2017.09.009. ISSN 1558-3171. PMID 29191281. 
  10. ^ Garcea, Giuseppe; Dennison, Ashley R.; Pattenden, Clare J.; Neal, Christopher P.; Sutton, Christopher D.; Berry, David P. (2008-03-08). "Survival following curative resection for pancreatic ductal adenocarcinoma. A systematic review of the literature". JOP: Journal of the pancreas. 9 (2): 99–132. ISSN 1590-8577. PMID 18326920. 
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  13. ^ Gurusamy, Kurinchi Selvan; Lusuku, Charnelle; Halkias, Constantine; Davidson, Brian R. (2016-02-03). "Duodenum-preserving pancreatic resection versus pancreaticoduodenectomy for chronic pancreatitis". The Cochrane Database of Systematic Reviews. 2: CD011521. doi:10.1002/14651858.CD011521.pub2. ISSN 1469-493X. PMID 26837472. 
  14. ^ Testini, M; Regina, G; Todisco, C; Verzillo, F; Di Venere, B; Nacchiero, M (1998). "An unusual complication resulting from surgical treatment of periampullary tumours". Panminerva medica. 40 (3): 219–22. PMID 9785921. 
  15. ^ Wu, WM; Hong, XF (2014). "The effect of pylorus removal on delayed gastric emptying after pancreaticoduodenectomy: a meta-analysis of 2,599 patients". PLOS ONE. 9 (10): e108380. doi:10.1371/journal.pone.0108380. PMC 4182728Freely accessible. PMID 25272034. 
  16. ^ Hüttner, FJ; Fitzmaurice, C; Schwarzer, G; Seiler, CM; Antes, G; Büchler, MW; Diener, MK (2016). "Pylorus-preserving pancreaticoduodenectomy (pp Whipple) versus pancreaticoduodenectomy (classic Whipple) for surgical treatment of periampullary and pancreatic carcinoma". Cochrane Database Syst Rev. PMID 26905229. 
  17. ^ Michalski, Christoph W; Weitz, JüRgen; Büchler, Markus W (2007). "Surgery Insight: Surgical management of pancreatic cancer". Nature Clinical Practice Oncology. 4 (9): 526–35. doi:10.1038/ncponc0925. PMID 17728711. 
  18. ^ Karanicolas, PJ; Davies, E; Kunz, R; Briel, M; Koka, HP; Payne, DM; Smith, SE; Hsu, HP; Lin, PW (2007). "The pylorus: Take it or leave it? Systematic review and meta-analysis of pylorus-preserving versus standard whipple pancreaticoduodenectomy for pancreatic or periampullary cancer". Annals of Surgical Oncology. 14 (6): 1825–34. doi:10.1245/s10434-006-9330-3. PMID 17342566. 
  19. ^ Diener, MK; Knaebel, HP; Heukaufer, C; Antes, G; Büchler, MW; Seiler, CM (2007). "A systematic review and meta-analysis of pylorus-preserving versus classical pancreaticoduodenectomy for surgical treatment of periampullary and pancreatic carcinoma". Annals of Surgery. 245 (2): 187–200. doi:10.1097/01.sla.0000242711.74502.a9. PMC 1876989Freely accessible. PMID 17245171. 
  20. ^ Iqbal, N; Lovegrove, RE; Tilney, HS; Abraham, AT; Bhattacharya, S; Tekkis, PP; Kocher, HM (2008). "A comparison of pancreaticoduodenectomy with pylorus preserving pancreaticoduodenectomy: A meta-analysis of 2822 patients". European Journal of Surgical Oncology. 34 (11): 1237–45. doi:10.1016/j.ejso.2007.12.004. PMID 18242943. 
  21. ^ "The Whipple Procedure". Pri-Med Patient Education Center,. Harvard Health Publications. 2009. Archived from the original on 27 July 2011. 
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  23. ^ Syin, Dora; Woreta, Tinsay; Chang, David C.; Cameron, John L.; Pronovost, Peter J.; Makary, Martin A. (2007). "Publication Bias in Surgery: Implications for Informed Consent". Journal of Surgical Research. 143 (1): 88–93. doi:10.1016/j.jss.2007.03.035. PMID 17950077. 
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  28. ^ synd/3492 at Who Named It?

External links[edit]