Pancreatic Flashcards
Hepatic system functions to convert ____ and excrete ____
Bilirubin and ammonia
Hepatic system is the sole source of what protein?
Albumin
T/F Hepatic system synthesizes clotting factors and cholesterol.
True
Hepatic system detoxifies the body of what?
Drugs, ETOH, toxins
Hepatic system stores what?
Glycogen, vitamins, iron
Liver receives what % of cardiac output?
25%
The liver receives blood from what two places?
- Portal vein (from organs)
2. Hepatic artery
T/F The portal vein (from organs) provides approximately two-thirds of the blood supply, while the hepatic artery provides the rest.
True
What is the functional unit of the liver?
Liver lobule
S&S of hepatic disease include:
- Include GI symptoms - N&V, Diarrhea, Constipation, Heartburn, Abdominal pain, GI bleeding
- Edema/ascites
- Dark Urine
- Light/clay-colored stools
- Right upper quadrant abdominal pain
- Neurologic involvement: Confusion, muscle tremors, sleep disturbances, hyperreactive reflexes
- Hepatic Osteodystrophy (abnormal development of bone)
- Osteoporosis:
- Skin changes: Jaundice, increased bruising
Why does hepatic disease cause dark urine?
- Yellow-orange breakdown product of hemoglobin
2. Bilirubin accumulates in liver -> moves into blood -> increase in urine -> may suggest liver damage
Why does hepatic disease cause Light/clay-colored stools?
- Reduced ability of the liver to excrete bilirubin into the gut
T/F Jaundice (Icterus) is a symptom, not a disease.
True
What is jaundice
Bilirubin breakdown product of RBC in macrophages
yellow discoloration of the skin, sclerae, and mucous membranes.
How does jaundice occur?
- Cause: Increased bilirubin production or decreased processing of bilirubin
- Hepatocyte dysfunction (hepatitis, hepatic disease, tumor), bilirubin accumulation
- Impaired bile flow: caused by mechanical damage due to some obstruction of biliary tree
Treatment of jaundice?
- Resolve underlying disease
- Return to normal color suggests resolution
- Then activity and exercise can be resumed
How can hepatic disease cause neurologic involvement?
- Ammonia converted into urea in the liver
- Ammonia comes from the degradation of amino acids
- Ammonia is then catabolized by the liver generating urea
- ↓ urea production leads to ammonia accumulation in the blood and neurological symptoms
What is the most common neurologic abnormality associated with liver failure?
- Flapping tremor elicited by attempted wrist extension while the forearm is fixed
- Maximal on sustained posture
- Usually bilateral, though one side can be affected more
Where is MSK location of pain associated with the liver and biliary system?
Posterior thoracic pain [inter scapular, R shoulder, R upper trap, R subscapular]
What is hepatic osteodystrophy?
- Abnormal development of bone/osteoporosis in individuals with chronic liver disease
- Leads to osteopenia and osteoporosis
(Decrease/Increase) size and weight of liver with aging.
↓ size & weight of liver
(Decrease/Increase) processing time of liver with aging.
↑ processing time
How do blood test values change with aging.
Blood test value results remain unchanged [disease vs aging]
Describe healing of liver:
- Occurs quickly
- Complete parenchymal regeneration or scarring or a combination
- Chronic hepatic injury → fibrosis (cirrhosis)
What is cirrhosis of the liver?
- Chronic disease of liver marked by degeneration of cells, inflammation, and fibrous thickening of tissue
- A late stage of scarring (fibrosis) of the liver caused by many forms of liver disease
Cirrhosis of the liver is typically a result of what two things?
- Alcoholism
2. Hepatitis
Significant loss of liver function associated with loss of ___% or more of liver function.
80%
Describe the cycle that causes cirrhosis of the liver:
- Liver inflammation causes tissue damage and necrosis
- Liver repairs itself
- Liver is reinjured leading to more tissue damage and necrosis
- This cycle of inflammation and healing leads to the replacement of liver tissue with bands of connective tissue
Practice implications of cirrhosis:
- Osteoporosis (bone injury)
- Impaired posture
- Impaired muscle performance/weakness (electrolyte dysfunction)
- Loss of balance
- Deconditioning
- Ascites/bilateral edema of feet and ankles
- Blood loss: Bruising/bleeding
- Rest to reduce metabolic demand on the heart is recommended; rest during treatment sessions and avoid unnecessary fatigue
What is the portal vein?
- a vein conveying blood to the liver from the spleen, stomach, pancreas, gall bladder and intestines
- Carries about 75% of the blood going to the liver
T/F The portal vein conducts blood to capillary beds in the liver, i.e. it is not a true vein.
True
A portal system by definition does what?
links two capillary beds together
Portal hypertension -
as an increase in hepatic sinusoidal blood pressure > 6 mm
What contributes to portal hypertension?
Fibrosis, and abnormal liver architecture combine to form mechanical barriers to blood flow in the liver increasing the resistance and blood pressure in the hepatic portal system
Increased portal pressure will cause what?
- retrograde flow of blood back into the stomach, spleen, large and small intestine, rectum and esophagus
- Result in varices back upstream
What is a varice?
- Varices: An abnormally dilated vessel with a tortuous course
- Varicose veins as seen in lower extremities
- May leak blood or bleed
- Serious bleeding can quickly result in hypovolemia, shock, and death
Consequences of portal hypertension:
- Ascites: from increased hydrostatic venous pressure
- Splenomegaly: enlargement of the spleen caused by venous congestion in spleen
- Hemorrhoids: from venous congestion in the bowel
- Varices: Esophagus, stomach, rectum or umbilical area (May rupture and bleed)
Portal hypertension can cause splenomegaly which can lead to what 3 things?
- Moderate anemia
- Neutropenia
- Thrombocytopenia
Hepatic Encephalopathy -
- Potentially irreversible, decreased level of consciousness in people with severe liver disease
- Thought to be caused by elevated blood ammonia and altered neurotransmitter status in the brain
- Insidious onset; progressive worsening of symptoms as disease progresses
How does hepatic encephalopathy occur?
- Ammonia is created by bacteria in the colon from the metabolism of protein and urea.
- Ammonia is absorbed into the portal blood system and transported to the liver where it is converted into urea
- But the diseased liver cannot metabolize the ammonia
- Blood ammonia levels go up impairing cognitive and motor function at the level of the brain
Symptoms of hepatic encephalopathy:
- Depression, personality changes, impaired attention
- Drowsiness, sleep disorders, ataxia, asterixis (rapid extension-flexion motion of the head and extremities), slurred speech, hyperreflexia
- Marked confusion, incoherent speech, muscle rigidity
- Stupor, decerebrate posturing, positive Bobinski’s, dilated pupils
Decorticate posturing vs. decerebrate
Decorticate - flexion of wrist and elbows (upper midbrain damage - corticospinal tracts)
Decerebrate - extension of elbow (upper pontine damage)
T/F Symptoms can be reversed if cause is determined.
True
Bleeding, infection, hypovolemia, hypokalemia
Anti-depressants, high dietary protein, diuretics
Implications of hepatic encephalopathy for the PT:
- Patient safety
- Impaired motor and sensory integrity i.e. impaired mobility, balance,
- Impaired arousal
- Risk for pressure ulcers secondary to malnutrition, immobility, edema
Ascites -
Abnormal accumulation of fluid in the peritoneal cavity
Ascites associated with what issues?
Associated with cirrhosis/portal hypertension
Ascites can lead to what?
Can lead to Wt. gain, abdominal distension, peripheral edema, inappropriate dyspnea
Management of ascites:
- Paracentesis
- albumin consumption
- diuretics
- sodium and fluid restriction
Implications of ascites:
- Accompanying impaired cardiac and respiratory function
- Lymphedema
- Integumentary disorders (peripheral edema, reduced blood flow (congestion), lymphedema
- Malnutrition
- Muscle degradation
What is a sinusoid and how does it contribute to the fundamental function of the liver i.e. purifying the blood?
- A sinusoid is a discontinuous capillary that receives blood from terminal branches of the hepatic artery and portal vein and delivers it to the central veins (through the liver cells)
- allows for blood filtration, and regulation of blood flow
Hepatitis -
- Inflammatory (acute or chronic) condition of the liver
What causes hepatitis?
- Infection by one of several viruses with specific affinity for the liver (A, B, C, D, E)
- Other viruses, but not liver-specific including Epstein-Barr or CMV (cyto-megalovirus)
What causes chronic hepatitis -
- viruses
- medications
- metabolic abnormalities
- autoimmune disorder
- idiopathic
T/F Most people with chronic hepatitis are asymptomatic and when symptoms appear, they are nonspecific
True
How do you diagnose viral hepatitis?
- Symptoms
- Physical Exam
- Blood test (specific Ab, liver function tests)
- liver biopsy (chronic inflammation, necrosis)
Symptoms of viral hepatitis:
- N & V
- Poor appetite, Wt. loss
- Weakness
- Jaundice, Dark urine
- Pale or clay-colored stool
- Fatigue
- Most people have vague or no symptoms at all
Prognosis of viral hepatitis dependent on what factors?
- Type of hepatitis
- presence of liver comorbidities
- development of cirrhosis
- Occurrence of liver cancer and/or cirrhosis hastens the progression
- Moderate-to-severe ETOH consumption
Hep A formerly known as what?
infectious hepatitis
How is HAV spread?
Spread by close personal contact or oral-fecal contamination of water and food, poor hand hygiene, shared use of oral utensils
How contagious is HAV?
Highly
Does HAV have a vaccine?
Yes, preventable with vaccine
Prognosis of HAV:
- Most persons with acute disease recover with no lasting liver damage
- rarely fatal
Hep B formerly known as what?
Serum Hepatitis
How is HBV spread?
Spread by blood transfusions, needle sticks, IV drug use/shared needles, dialysis, sexual contact, exchange of bodily fluid
T/F HBV is considered a STD because it is transmitted via sexual intercourse
True