Unit 3: Cirrhosis Flashcards
What is the leading cause of cirrhosis?
Hepatitis C
Risk Factors for Developing Cirrhosis
- chronic infection with hepatitis A, B, or C
- chronic alcoholism
- biliary disease
- accumulation of fat in the liver
- autoimmune diseases
How to prevent cirrhosis
- improving health habits
- refraining from risky behaviors (needle sharing, unprotected sex)
- refraining from consumption of alcohol
- receiving vaccination for hepatitis
Laennec’s Cirrhosis
- alcohol-induced cirrhosis
- results from chronic alcoholism and malnutrition
- fibrosis occurs around central veins and portal areas
- may develop vascular or arterial spider angiomas on the abdomen; look like spider legs
- may develop reddened palms (palmar edema)
Post-necrotic or Micronodular Cirrhosis
-involves bands of scar tissue in the liver d/t previous acute viral hepatitis or exposure to hepatotoxins
Biliary Cirrhosis
- scarring of the liver tissue around the bile ducts and lobes of the liver b/c of chronic biliary obstruction and infection or cholangitis (inflammation of common bile duct)
- develop severe itching (pruritis) b/c of retention of bile salts
Nonalcoholic Steatohepatitis (NASH)
- cause of cirrhosis
- found in obese patients
- caused by accumulation of fat in liver cells, which leads to inflammation of the liver cells and over time results in cirrhosis
- NASH diagnosed by liver biopsy
Genetic causes of Cirrhosis
- Wilson’s disease
- Hemochromatosis (iron overload)
Wilson’s Disease
- cause of cirrhosis
- there is an abnormality of a protein that causes excessive accumulation of copper in the liver leading to chronic inflammation
- treatment: decrease levels of copper
Hemochromatosis
- causes cirrhosis
- iron overload
- there is an abnormally high accumulation of iron, which leads to chronic liver inflammation and cirrhosis
- Treatment: decrease levels of iron
Causes of Cirrhosis
- alcohol-induced (Laennec’s cirrhosis)
- post-necrotic or micronodular cirrhosis
- biliary cirrhosis
- nonalcoholic steatohepatitis (NASH)
- Wilson’s disease (copper overload)
- hemochromatosis (iron overload)
- autoimmune diagnosis
- hepatotoxins
- medications
- parasites
- cardiac dysfunction; cardiac cirrhosis (causes decreased oxygenation of liver cells, leading to liver cell death)
Cirrhosis of the Liver
causes cell destruction and fibrosis or scarring of hepatic tissues
Pathophysiology of Cirrhosis of the Liver
- Functional liver cells die, and damaged liver cells regenerate into nodules of liver cells that are surrounded by fibrous tissue
- bloody supply to this area is abnormal and occurs through a thick capillary network surrounding these nodules
- this irreversible chronic injury to functional liver cells result in liver cell necrosis, altered liver structure and function, and leads to alterations in blood and lymph flow resulting in hepatic insufficiency and hypertension in the portal vein
Portal Hypertension
- d/t alteration of blood flow to the liver
- an increase in the pressure in the veins that carry blood through the liver
Portal Hypertension
- d/t alteration of blood flow to the liver
- an increase in the pressure in the veins that carry blood through the liver
Alterations of blood flow to the liver results in?
> Portal hypertension
Shunting of blood around the liver, bypassing the liver cells
-while the blood reaches the liver from the stomach, intestines, spleen, and pancreas, it travels through the portal vein branching into the liver
-b/c these vessels are blocked by the scarring of the liver, blood cannot flow freely and blood backs up, causing an increase in pressure that leads to the enlargement of the veins in the esophagus, skin of abdomen, and veins in rectum and anus (hemorrhoids)
-this shunting of blood around the liver causes increased pressure in the surrounding vessels resulting in esophageal varices and gastric varices (abnormally dilated and weak veins), which may result in upper GI bleeding
Ascites
accumulation of protein-rich fluid in the abdominal cavity
- associated w/ poor quality of life, increased risk of infection, and poor long-term outcome
- may develop pleural effusions b/c of the exchange of fluid across the diaphragm to the pleural space surrounding the lungs
Coagulopathy
- B/c the liver synthesizes most of the coagulation cascade factors and fibrinolytic proteins, liver disease impacts the synthesis of clotting factors and coagulation mechanisms, leading to prolonged or excessive bleeding
- patients w/ liver disease are thrombocytopenic and have a prolonged PT
- some pts may exhibit bleeding, leading to disseminated intravascular coagulation (DIC)
Disseminated Intravascular Coagulation (DIC)
small blood clots form inside blood vessels, which in turn disrupt blood flow to organs and disrupt normal coagulation leading to excessive bleeding from the GI tract, pulmonary system, wounds, and any skin puncture sites such as IV sites
Hepatic Encephalopathy
- disturbance in central nervous system
- changes in motor function, changes in level of consciousness ranging from restlessness and confusion to seizures and coma
- staged based on severity of clinical presentation
- main cause: accumulation of ammonia and toxins in the blood that are normally detoxified by the liver; accumulations lead to altered neurological status
- other causes: dehydration, excessive diuresis, infection, surgery, fever, and exposure to sedatives or antianxiety medications
Stages of Hepatic Encephalopathy
> 1: slurred speech, tremors, lethargy and euphoria, reversal of day and night sleep patterns; asterixis, impaired writing, impaired decision making, poor coordination
2: increased drowsiness, disorientation, inappropriate behavior, mood swings, agitation; asterixis, fetor hepaticus (sweet fecal smell of breath)
3: severe confusion, difficult to awaken, slurred speech; asterixis, increased deep tendon reflexes, rigid extremities
4: coma, nonresponsive to painful stimulus
Clinical Manifestations of Cirrhosis
based on the degree of liver involvement; progressively more pronounced as liver dysfunction worsens
- SOB
- Jaundice
- Increased abdominal girth
- Abdominal pain and bloating
- Enlarged spleen
- Elevated Liver enzymes
- Increased risk of bleeding
- Thrombocytopenia (low platelets)
- Prolonged PT
- Hemorrhoids
- Elevated serum ammonia levels
- Changes in LOC
- Changes in motor function
- Hyponatremia
- Asterixis (flapping tremor of the hand when wrist extended)
Clinical Manifestations of Cirrhosis
based on the degree of liver involvement; progressively more pronounced as liver dysfunction worsens
- SOB
- Jaundice
- Increased abdominal girth
- Abdominal pain and bloating
- Enlarged spleen
- Elevated Liver enzymes
- Increased risk of bleeding
- Thrombocytopenia (low platelets)
- Prolonged PT
- Hemorrhoids
- Elevated serum ammonia levels
- Changes in LOC
- Changes in motor function
- Hyponatremia
- Asterixis (flapping tremor of the hand when wrist extended)
Lab Values to Assess with Liver disease
- ALT
- AST
- Alkaline Phosphate (total)
- Alkaline phosphate (liver fraction)
- Bilirubin (total, direct)
- Albumin
- Ammonia
- Coagulation Tests (PT, aPTT)
- Platelets
ALT
Males: 13 to 40 units/L
Females: 24-36 units/L
-Result of liver disease: Elevated
AST
Males: 20-40 units/L
Females: 15-35 units/L
-Result of liver disease: Elevated
Alkaline Phosphate (Total)
Males: 35-142 units/L
Females: 25-125 units/L
-Result of liver disease: Elevated
Alkaline Phosphate (Liver Fraction)
0-93 units/L
Bilirubin: Total
- 3 to 1 mg/dL
- Result of liver disease: Elevated
Bilirubin: Direct
- 1 to o.3 mg/dL
- Result of liver disease: Elevated
Albumin
- 4 to 5.1 g/dL
- Result of liver disease: decreased
Ammonia
-Result of liver disease: Elevated
Prothrombin Time (PT)
10 to 13 seconds
-Result of liver disease: prolonged
Partial thromboplastin time (aPTT)
25 to 35 seconds
-Result of liver disease: prolonged