Flashcards in GI 3 Deck (49)
Jaundice results from the retention of ______ and an abnormality in the processing of ________.
retention of bile, abnormal processing of bilirubin
What are the four general stages of bilirubin metabolism?
1. Production (heme degradation)
2. Uptake by liver
4. Transport to the duodenum through the bile ducts.
What are the three types of jaundice?
Describe hemolytic jaundice.
Hemolytic anemia with excessive production of unconjugated bilirubin (excessive heme breakdown)
Describe hepatocellular jaundice.
When there is a problem in the liver:
1. Messed up liver uptake.
2. Messed up conjugation of bilirubin
3. Messed up. transport to the duodenum.
Crigler-Najjar and Gilbert are characterized by a problem with bilirubin _______.
Hepatitis, generalized liver cell injury, and some drugs can affect the liver's ability to ________ bilirubin.
Dubin-Johnson syndrome is characterized by defective ________ of conjugated bilirubin.
What is cholestasis?
Arrested bile flow.
What are two causes of cholestasis?
1. Intrinsic liver disease (intrahepatic cholestasis)
2. Bile duct obstruction (extrahepatic cholestasis)
What is the "hallmark" of cholestasis?
Brownish pigment within dilated canaliculi and hepatocytes and bile duct proliferation.
Name two clinical findings that would suggest cholestasis.
1. Jaundice and pruritus (itchiness) due to deposition of bile acids in skin.
2. Elevated serum alkaline phosphatase.
Cirrhosis is the end stage of ________ _______ disease.
chronic liver disease
Define liver cirrhosis and list its 3 main characteristics
End stage of chronic liver disease characterized by:
1. Bridging fibrous septa around multiple adjacent lobules.
2. Parenchymal nodules (fibrous bands surrounding several hepatocytes).
3. Disruption of the normal architecture of the entire liver
Name 5 causes of cirrhosis.
1. Alcoholic liver disease
3. Chronic hepatitis
4. Biliary disease
5. Metabolic diseases like hemochromatosis, a-1-alphatrypsin deficiency, glycogen storage diseases.
List the four pathogenic stages of cirrhosis.
1. Hepatocyte death
3. ECM deposition and fibrosis
4. Vascular reorganization
Answer these questions regarding cirrhosis:
1. How does collagen contribute to the disease?
2. Why is vascular reorganization a bad thing?
3. What role do hepatic stellate cells play?
1. Collagens Type 1 and 3 are deposited in the space of Disse (where only thin strtands of Type 4 normally are), resulting in the loss of capillary fenestration and impaired exchange of solutes.
2. The fibrotic capillaries promote revascularization, which shunts blood away from the hepatocytes - eliminating the point of having a liver.
3. Hepatic stellate cells proliferate and turn into highly fibrogenic MYOFIBROBLASTS.
What do the hepatocytes that are able to survive in the case of cirrhosis end up doing?
They proliferate as spherical nodules within the confines of the fibrous septa to create a fibrotic, nodular liver with poor blood flow and impaired function.
Are Kupffer cells also involved in the fibrogenic pathogenesis of cirrhosis?
Name the clinical features of liver cirrhosis and three complications from it that can cause death.
1. Weight loss or anorexia
2. Weakness --> debilitation
Death results from liver failure, complications related to portal hypertension, development of hepatocellular carcinoma.
Name three major complications resulting from portal hypertension.
1. Esophogeal varices and hemorrhage.
2. Ascites from decreased liver function (no albumin).
Portal hypertension in women may result in hypogonadism, potentially causing _______, ________, and ________.
oligomenorrhea, amenorrhea, or sterility
Portal system collateral veins are located in the __________ of the lower esophagus and upper stomach and communicate with the portal and the _______ coronary vein.
located in the submucosa of the lower esophagus and upper stomach and communicate with the portal and the gastric coronary vein
Can dilation of the submucosal esophogeal/gastric veins due to portal hypertension protrude into the GI lumen?
How can portal hypertension affect the spleen?
The portal vein and splenic vein are connected, so a backup in the portal vein shunts blood to the spleen --> enlargement - splenomegaly.
What is pancytopenia? Name a disease that can cause it.
It is when there are decreased numbers of red, white cells, and platelets in the blood. Hypersplenism from portal hypertension can cause it.
Describe the gross morphological changes of splenomegaly.
Firm, enlarged, cut surface is deep red, no apparent white pulp.
By what four physiologic mechanisms can fluid accumulate in the peritoneal cavity (ascites)?
1. Decreased plasma oncotic pressure due to liver dysfunction.
2. Portal hypertension increases hydrostatic pressure of mesenteric arteries.
3. Sinusoidal hypertension in the liver --> lymph "weeps" into the abdomen.
4. Hyperaldosteronism --> renal retention of Na+ and H2O.
What is caput medusae? What causes it?
It is the appearance of distended and engorged paraumbilical veins, which are seen radiating from the umbilicus across the abdomen to join systemic veins.. It is caused by recanalization of the umbilical vein by liver failure/portal hypertension.