World Library  
Flag as Inappropriate
Email this Article

Primary sclerosing cholangitis

Article Id: WHEBN0000864489
Reproduction Date:

Title: Primary sclerosing cholangitis  
Author: World Heritage Encyclopedia
Language: English
Subject: Ulcerative colitis, Crohn's disease, Secondary sclerosing cholangitis, Chris Klug, Intercept Pharmaceuticals
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Primary sclerosing cholangitis

Primary sclerosing cholangitis
Classification and external resources
Cholangiogram of primary sclerosing cholangitis.
ICD-10 K83.0
ICD-9 576.1
OMIM 613806
DiseasesDB 10643
MedlinePlus 000285
eMedicine med/3556
MeSH D015209

Primary sclerosing cholangitis (PSC) is a disease of the bile ducts that causes inflammation and subsequent obstruction of bile ducts both inside and outside of the liver. The inflammation impedes the flow of bile to the gut, which can ultimately lead to cirrhosis of the liver, liver failure, and liver cancer. The underlying cause of the inflammation is believed to be autoimmunity;[1] and more than 80% of those with PSC have ulcerative colitis.[2] The definitive treatment is a liver transplant.

Signs and symptoms

PSC is characterized by recurrent episodes of cholangitis (inflammation of the bile ducts), with progressive biliary scarring and obstruction.

Cause

The cause of PSC is unknown, although it is thought to be an autoimmune disorder. There is an increased prevalence of HLA alleles A1, B8, and DR3 in primary sclerosing cholangitis.[1]

Pathophysiology

Inflammation damages bile ducts both inside and outside of the liver. The resulting scarring of the bile ducts blocks the flow of bile, causing cholestasis. Bile stasis and back-pressure induces proliferation of epithelial cells and focal destruction of the liver parenchyma, forming bile lakes. Chronic biliary obstruction causes portal tract fibrosis and ultimately biliary cirrhosis and liver failure.[3]
Bile assists in the intestinal breakdown and absorption of fat; the absence of bile leads to fat malabsorption and deficiencies of fat-soluble vitamins (A, D, E, K).

Diagnosis

PSC is diagnosed by visualizing the bile duct with imaging, usually in the setting of endoscopic retrograde cholangiopancreatography (ERCP), which shows "beading" (both strictures and dilation) of bile ducts inside and outside of the liver. Another option is magnetic resonance cholangiopancreatography (MRCP), where magnetic resonance imaging is used to visualize the biliary tract.

Most people with PSC have evidence of autoantibodies. Approximately 80% of people with PSC have perinuclear anti-neutrophil cytoplasmic antibodies; however, this finding is not specific to those with the disease. Antinuclear antibodies and anti-smooth muscle antibody are found in 20%-50% of PSC patients and, likewise, are not specific for the disease.[1]

Other tests often done are a full blood count, liver enzymes, bilirubin levels (usually grossly elevated), kidney function, and electrolytes. Fecal fat determination is occasionally ordered when the symptoms of malabsorption are prominent.

The differential diagnosis can include primary biliary cirrhosis, drug induced cholestasis, cholangiocarcinoma, and HIV-associated cholangiopathy.

Management

Standard treatment includes ursodiol, a bile acid naturally produced by the liver, which has been shown to lower elevated liver enzyme numbers in people with PSC, but has not improved liver- or overall survival.[4] Treatment also includes medication to relieve itching (antipruritics), bile acid sequestrants (cholestyramine), antibiotics to treat infections, and vitamin supplements, as people with PSC are often deficient in vitamin A, vitamin D, vitamin E and vitamin K.

In some cases, ERCP, which may involve stenting of the common bile duct, may be necessary in order to open major blockages (dominant strictures).

Liver transplantation is the only proven long-term treatment of PSC. Indications for transplantation include recurrent bacterial cholangitis, jaundice refractory to medical and endoscopic treatment, decompensated cirrhosis and complications of portal hypertension. In one series, 1, 2, and 5 year survival following liver transplantation for PSC was 90%, 86% and 85% respectively.[1]

Prognosis

A German study in 2007 estimated the average survival time from time of diagnosis to be approximately 25 years, and the median time until either death or liver transplantation to be approximately 10 years.[5]

Related diseases

Primary sclerosing cholangitis is associated with cholangiocarcinoma,[6] a cancer of the biliary tree, and the lifetime risk for PSC sufferers is 10-15%.[7] This represents a 160-fold greater risk of developing cholangiocarcinoma compared to the general population.[7] Screening for cholangiocarcinoma in patients with primary sclerosing cholangitis is encouraged, but there is no general consensus on the modality and interval of choice. Colon cancer is also associated with PSC.[6]

PSC has a significant association with ulcerative colitis, an inflammatory bowel disease primarily affecting the large intestine. As many as 5% of patients with ulcerative colitis may progress to develop primary sclerosing cholangitis[8] and approximately 70% of people with primary sclerosing cholangitis have ulcerative colitis.[3]

Epidemiology

There is a 2:1 male-to-female predilection of primary sclerosing cholangitis.[3] The disease normally starts from age 20 to 30, though may begin in childhood. PSC progresses slowly, so the disease can be active for a long time before it is noticed or diagnosed. There is relatively little data on the prevalence and incidence of primary sclerosing cholangitis, with studies in different countries showing annual incidence of 0.068–1.3 per 100,000 people and prevalence 0.22–8.5 per 100,000; given that PSC is closely linked with ulcerative colitis, it is likely that the risk is higher in populations where UC is more common.[9]

See also

References

  1. ^ a b c d Charatcharoenwitthaya P, Lindor KD (Feb 2006). "Primary sclerosing cholangitis: diagnosis and management". Current Gastroenterology Reports 8 (1): 75–82.  
  2. ^ Sleisenger, MH (2006). Sleisenger and Fordtran's gastrointestinal and liver disease: pathophysiology, diagnosis, management (8th ed.). Philadelphia: Saunders. 
  3. ^ a b c Robbins SL, Kumar V, Cotran RS (2003). "Chapter 16". Robbins basic pathology (7th ed.). Philadelphia: Saunders. pp. 620–1.  
  4. ^ Lindor KD, Kowdley KV, Luketic VA, Harrison ME, McCashland T, Befeler AS, Harnois D, Jorgensen R, Petz J, Keach J, Mooney J, Sargeant C, Braaten J, Bernard T, King D, Miceli E, Schmoll J, Hoskin T, Thapa P, Enders F (Sep 2009). "High-dose ursodeoxycholic acid for the treatment of primary sclerosing cholangitis". Hepatology 50 (3): 671–3.  
  5. ^ Tischendorf, J.; Hecker, H.; Krüger, M.; Manns, M.; Meier, P. (2007). "Characterization, outcome, and prognosis in 273 patients with primary sclerosing cholangitis: A single center study". The American journal of gastroenterology 102 (1): 107–114.   [1]. Giving survival time: 306 months
  6. ^ a b Tsaitas C, Semertzidou A, Sinakos E (April 2014). "Update on inflammatory bowel disease in patients with primary sclerosing cholangitis". World J Hepatol 6 (4): 178–87.  
  7. ^ a b Kummen M, Schrumpf E, Boberg KM (August 2013). "Liver abnormalities in bowel diseases". Best Pract Res Clin Gastroenterol 27 (4): 531–42.  
  8. ^ Olsson R, Danielsson A, Järnerot G, et al. (1991). "Prevalence of primary sclerosing cholangitis in patients with ulcerative colitis". Gastroenterology 100 (5 Pt 1): 1319–23.  
  9. ^ Feld JJ, Heathcote EJ (October 2003). "Epidemiology of autoimmune liver disease". J. Gastroenterol. Hepatol. 18 (10): 1118–28.  

External links

  • PSC Partners: Patient organization with additional information
  • PSC Support: Charity with additional information, discussion forum and support tools for those affected by PSC
  • Additional Literature about PSC
  • Information from The Morgan Foundation for the Study of PSC
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.