Acute cholecystitis pathophysiology
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
Overview
The exact pathogenesis of [disease name] is not fully understood.
OR
It is thought that [disease name] is the result of / is mediated by / is produced by / is caused by either [hypothesis 1], [hypothesis 2], or [hypothesis 3].
OR
[Pathogen name] is usually transmitted via the [transmission route] route to the human host.
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Following transmission/ingestion, the [pathogen] uses the [entry site] to invade the [cell name] cell.
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[Disease or malignancy name] arises from [cell name]s, which are [cell type] cells that are normally involved in [function of cells].
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The progression to [disease name] usually involves the [molecular pathway].
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The pathophysiology of [disease/malignancy] depends on the histological subtype.
Pathophysiology
Pathogenesis
The pathogenesis of acute cholecystitis involves the following:
- Inflammation of the gallbladder is termed as cholecystitis. Acute calculous cholecystitis is usually caused by the mechanical obstruction due to gallstones. Acute acalculous cholecystitis is caused predominantly by the gallbladder stasis.
- Obstruction of the gallbladder:
- Gallstones are the most common cause of physical obstruction of the gallbladder usually at the neck or in the cystic duct. The obstruction causes an increased pressure as the gallbladder mucosa continues to produce mucus. This raised pressure may cause the venous congestion which is followed by the arterial congestion. Eventually, the raised pressure and stasis leads to the gallbladder ischemia and necrosis.
- There are two major types of gallstones:
- Cholesterol gallstones:
- Cholesterol gallstones are the most predominant form of the gallstones. They account for approximately 80% of the total gallstones.
- The formation of gallstones is dependant on the following factors:
- Cholesterol supersaturation in the bile
- Crystal nucleation
- Gallbladder dysmotility
- Gallbladder absorption
- Pigmented gallstones:
- There are two types of pigmented gallstones.
- Black stones
- Black stones consist of calcium bilirubinate and mucin glycoproteins.
- Black stones are predominantly associated with hemolytic conditions or cirrhosis (as a result of increased levels of unconjugated bilirubin).
- These stones are usually located in the gallbladder.
- Brown stones
- Brown stones are usually associated with bacterial infection.
- Brown stones are usually located elsewhere in the biliary tree as opposed to the gallbladder.
- Black stones
- There are two types of pigmented gallstones.
- Cholesterol gallstones:
- There are two major types of gallstones:
- Mechanical obstruction of the gallbladder as a result of polyps, malignancy, an infestation of the gallbladder with parasites, foreign bodies, and trauma may also lead to the acute cholecystitis.
- Gallstones are the most common cause of physical obstruction of the gallbladder usually at the neck or in the cystic duct. The obstruction causes an increased pressure as the gallbladder mucosa continues to produce mucus. This raised pressure may cause the venous congestion which is followed by the arterial congestion. Eventually, the raised pressure and stasis leads to the gallbladder ischemia and necrosis.
- Gallbladder stasis:
- Gallbladder stasis is usually due to the lack of gallbladder stimulation and contractility.
- This leads to concentration of the bile salts with a build-up of pressure within the organ. An increased intraluminal pressure results in ischemia and necrosis of the gallbladder.
- The gallbladder stasis also facilitates the proliferation of the bacterias such as Escherichia coli, Klebsiella, Bacteroides, Proteus, Pseudomonas, and Enterococcus faecalis. This can also cause an inflammatory reaction in the gallbladder.
- Obstruction of the gallbladder:
Genetics
- Acute cholecystitis is more common in siblings and first degree relatives of affected persons.[1][2]
- Lith gene is involved in the pathogenesis of cholecystitis.[3]
- Mutations in the hepatic cholesterol transporter ABCG8 also predispose to the development of gallstones.[4]
Associated Conditions
The following conditions are associated with acute cholecystitis:[5]
- Diabetes
- Insulin resistance
- Cardiovascular diseases
- Non-alcoholic fatty liver disease (NAFLD)
- Gastrointestinal malignancies
- Gastric cancer
- Hepatocellular carcinoma
- Cholangiocarcinoma
- Pancreatic cancer
- Cancer of the ampulla of Vater
Gross Pathology
- On gross pathology, acute cholecystitis has the following features:[6][7][8][9]
- Enlarged/distended gallbladder
- Serosal or mucosal exudates
- Thickened wall with hemorrhage and edema
- Ulcers, pus, bile, and gallstones
Microscopic Pathology
- On microscopic histopathological analysis, acute cholecystitis has the following features:[7][8][10][11]
- Edematous and hemorrhagic gallbladder wall
- Mucosal necrosis with neutrophil infiltration
- Eosinophilic infiltration of the gallblader mucosa
- Specific microscopic features of acalculous cholecystitis:[6]
- Bile infiltration of gall bladder wall
- Bile infiltration and leucocyte margination of blood vessels
- Lymphatic dilation
References
- ↑ "An Increased Familial Frequency of Gallstones - Gastroenterology".
- ↑ Weiss KM, Ferrell RE, Hanis CL, Styne PN (1984). "Genetics and epidemiology of gallbladder disease in New World native peoples". Am. J. Hum. Genet. 36 (6): 1259–78. PMC 1684666. PMID 6517051.
- ↑ Wang HH, Portincasa P, Afdhal NH, Wang DQ (2010). "Lith genes and genetic analysis of cholesterol gallstone formation". Gastroenterol. Clin. North Am. 39 (2): 185–207, vii–viii. doi:10.1016/j.gtc.2010.02.007. PMID 20478482.
- ↑ Lammert F, Gurusamy K, Ko CW, Miquel JF, Méndez-Sánchez N, Portincasa P, van Erpecum KJ, van Laarhoven CJ, Wang DQ (2016). "Gallstones". Nat Rev Dis Primers. 2: 16024. doi:10.1038/nrdp.2016.24. PMID 27121416.
- ↑ Tiderington E, Lee SP, Ko CW (2016). "Gallstones: new insights into an old story". F1000Res. 5. doi:10.12688/f1000research.8874.1. PMC 4962289. PMID 27508070.
- ↑ 6.0 6.1 Laurila JJ, Ala-Kokko TI, Laurila PA, Saarnio J, Koivukangas V, Syrjälä H, Karttunen TJ (2005). "Histopathology of acute acalculous cholecystitis in critically ill patients". Histopathology. 47 (5): 485–92. doi:10.1111/j.1365-2559.2005.02238.x. PMID 16241996.
- ↑ 7.0 7.1 Owen CC, Bilhartz LE (2003). "Gallbladder polyps, cholesterolosis, adenomyomatosis, and acute acalculous cholecystitis". Semin. Gastrointest. Dis. 14 (4): 178–88. PMID 14719768.
- ↑ 8.0 8.1 McChesney JA, Northup PG, Bickston SJ (2003). "Acute acalculous cholecystitis associated with systemic sepsis and visceral arterial hypoperfusion: a case series and review of pathophysiology". Dig. Dis. Sci. 48 (10): 1960–7. PMID 14627341.
- ↑ Huang SM, Yao CC, Pan H, Hsiao KM, Yu JK, Lai TJ, Huang SD (2010). "Pathophysiological significance of gallbladder volume changes in gallstone diseases". World J. Gastroenterol. 16 (34): 4341–7. PMC 2937116. PMID 20818819.
- ↑ Kasprzak A, Malkowski W, Biczysko W, Seraszek A, Sterzyńska K, Zabel M (2011). "Histological alterations of gallbladder mucosa and selected clinical data in young patients with symptomatic gallstones". Pol J Pathol. 62 (1): 41–9. PMID 21574105.
- ↑ Yaylak F, Deger A, Bayhan Z, Kocak C, Zeren S, Kocak FE, Ekici MF, Algın MC (2016). "Histopathological gallbladder morphometric measurements in geriatric patients with symptomatic chronic cholecystitis". Ir J Med Sci. 185 (4): 871–876. doi:10.1007/s11845-015-1385-3. PMID 26602767.