Week 10: Hepatic Fxn and Transplant Flashcards
Liver
largest GLAND in the boyd at 3-4 pounds
highly vascular wiht 4 different lobes
Where is the liver located
beneath the diaphragm and right upper quadrant
this is important since it is close to the GI tract where it gets nutrients and plays a key role in whether these are stored or not
About how much blood circulates in the liver and how much is stored in the liver
1.5 L circulate within the liver with 200-400 mL of blood being stored by it
Portal Vein
75% of blood to the liver goes through the portal vein which is NUTRIENT RICH OXYGEN POOR blood from the spleen, intestines, etc
Hepatic Artery
25% of blood to the liver is goes through the hepatic artery from the heart and is NUTRIENT POOR OXYGEN RICH
What happens to the blood entering the liver lobules from the portal vein and hepatic artery
The blood mixes in the liver lobules –> through the hepatic veins –> inferior vena cava –> heart
Functions of the Liver
- Glucose Metabolism
- Ammonia Conversion
- Protein Metabolism
- Fat Metabolism
- Vitamin and Iron Storage
- Bile Formation
- Bilirubin Excretion
- Drug Metabolism
How does the liver do glucose metabolism
it helps maintain a stable blood glucose by storing glucose as glycogen and then converting it to glucose when needed
What is the ammonia conversion function of the liver
ammonia is what is left over after protein breakdown
liver takes ammonia and converts it to urea for excretion
Why are ammonia levels super important
ammonia can be toxic so levels are important to look at with hepatic disorders
What is the protein metabolism of the liver like
the liver makes proteins needed for clotting (so liver issues can lead to bleeding issues)
This means Vitamin K intake is important as it is needed to make factors in the liver
What does the liver do to fat
it stores fat and breaks it down to be used as energy, but too much can cause a fatty liver
What sort of vitamins adn minerals are stored in the liver
Vitamin A, B, D, Iron and Copper
Vitamin K is used a lot to make clotting factors here as well
Bile
a substance made and released in the liver to the gallbladder (storage)
when needing to digest fats the bile can emulsify them to help move them out of the body
Bilirubin
what is left once RBCs die and break down
it is carried into intestines and excreted in stool to cause the brown coloring
can be excreted in urine but the liver is working to get rid of the RBCs as they die and dispose of it in a timely manner
The liver is basically a ___ of the body
gatekeeper (think first pass)
More than ___% of the liver can be damaged before changes become abnormal
70
What sort of Liver Lab studies are done and seen with abnormal livers
CEA - presence can indicate cancer
PT increase - prolonged clotting = more bleeding
Protein Studies - Low levels means liver isnt making them
ALT, AST = Liver damage and enzymes release into blood
Bilirubin, Cholesterol (decreased in liver disease), and Ammonia (damage means higher as it usually becomes urea)
Liver Biopsy
Needle aspiration through the abdominal wall for analysis
A transvenous version can be done with fluoroscopy for real time rays guiding through the hepatic vein to the liver
Complications of a Liver Biopsy
bleeding
potential for bile peritonitis if gall bladder damaged
What needs to be done prior to a liver biopsy
coagulation studies since risk for bleeding is so high
we may even want to wait until pt is clear with meds to prevent bleeding
Blind Needle Aspiration
a version of liver biopsy where they are ultrasound guided or done laproscopically
used with severe ascites or abnormal anticoagulation studies
What needs to be done after a liver biopsy
Pt lay on right side for several hours to push liver against the costal margin for compression (can use a pillow)
2-3 hours of this
avoid coughing or straining
How often should you check VS after a liver biopsy
every 10-15 min for the first hour then every 30 minutes for the next 1-2 hours