Hepatobiliary Disease Flashcards
Structure and Function of the Liver
The liver is located in the (1) quadrant of the abdomen in the ______ space just below the right side of the _____ and under the ___ cage.
It is anatomically separated into ___ predominant lobes, a right and left lobe.
Function =
(1) large ligaments that separate the right and left lobe
(1) ligament on the bottom of the liver
(1) large vein that drains all the blood from lower limbs and carries it to the heart - liver empties directly into this
(1) structure connected to the liver
Right upper quadrant, peritoneal, diaphragm, rib cage
Two lobes
One of our major filtering organs
Falciform Ligament
Round Ligament
Inferior Vena Cava
Gallbladder
Blood Flow Through the Liver
The liver recieves __% of cardiac output on average.
Blood enters the liver through two vessels
- (1) carries blood from the GI tract directly to liver and is critical for liver to carry out all of its _____
- (1) functions to _______ the liver
These vessels converge and blood ____ as it passes through the hepatic _____ toward the ____ veins
The central veins drain into the _____ vein which then leads to the (1)
25%
- Portal vein, functions
- Hepatic artery, oxygenate
blood mixes, hepatic sinuses, central veins
hepatic vein, inferior vena cava
Blood Flow Through Liver (Notes)
Blood flow through the liver is very unusual - one of the only places we see venous and arterial blood _____
Portal vein: blood that enters this carries everything that was absorbed in the (1) - so that blood is critical for liver to carry out all of its _____
Hepatic Artery: branches off the (1) - ______ the liver
Flow of Blood =
Each of the hexagonal arrangement of cells is the _____
mixing
GI tract, functions
Abdominal aorta, oxygenates
Blood coming from GI tract -> portal vein -> hepatic sinuses -> mixes with arterial blood and passes through hexagonal arrangement of liver cells (hepatocytes) -> drains into central vein -> hepatic vein -> inferior vena cava
Filter
Hexagonal Arrangements of Hepatic Lobules
Hepatic Lobule =
- Hepatic Triad =
Blood moves into the hexagon: You can see the mixing of blood from hepatic artery (_____ blood) and portal vein (blood that needs _____) and direction as they pass through filtering liver cells and drains into _____ vein -> _____ vein -> ____ ____
Blood moves out of hexagon: Arrow of bile duct moves in the _____ direction bc hepatic cells are making bile and delivering it to the bile duct
Each corner of the hexagon
- Branch of Portal Vein, Hepatic Artery, Bile Duct
oxygenated, filtering, central -> hepatic -> vena cava
opposite direction
Gallbladder
As blood moves through the liver, away from the GI tract and toward the IVC, ____ moves in the opposite direction -> toward the (1) then into the (1)
Common bile duct merges with the _____ duct = (1) + (1) into duodenum
Bile -> common bile duct -> duodenum
pancreatic duct = bile + pancreatic juices
Overlapping Categories of Liver Function
(4)
Energy Metabolism and Substrate Interconversion
Protein Synthetic functions
Solubilization, transport, and storage functions
Protective and Clearance functions
Energy Metabolism and Substrate Interconversion
- (1) through gluconeogenesis and glycogenolysis
- (1) by pathways of glycogen synthesis, fatty acid synthesis, glycolysis, and the tricarboxylic acid cycle
- (1) from acetate, triglyceride synthesis from fatty acids, and secretion of both in VLDL particles
- (1) by endocytosis of HDL and LDL particles with excretion of cholesterol in bile, B-oxidation of fatty acids, and conversion of acetyl-CoA to ketones
- Deamination of amino acids and conversion of _____ to ____ via the urea cycle
- (1) and de novo synthesis of nonessential amino acids
- Glucose production
- Glucose consumption
- Cholesterol synthesis
- Cholesterol and trigyleride uptake
- Ammonia to Urea
- Transamination (ketone conversion used by brain for energy when glucose is unavailable)
Protein Synthetic Functions
Synthesis of various plasma _____, including a_____, ____ factors, b____ proteins, apo_____, angio_____, and insulin-like ____ factor I
proteins, albumin, clotting factors, binding proteins, apolipoproteins, angiotensinogen, growth
Solubilization, Transport, and Storage Functions
- D____ and p____ detoxification through phase I and II biotransformation reactions and excretion of _____
- Solubilization of ____ and fat soluble vitamines in bile for uptake by enterocytes
- _____ and secretion of VLDL and pre-HDL lipoprotein particles and ____ of HDL, LDL, and chylomicron remnants
- Synthesis and secretion of various binding _____, including transferrin, steroid hormone-binding globulin, thyroid hormone-binding globulin, ceruplasmin, and metallothionein
- Uptake and _____ of _____ A, D, B12, and folate
- Drug and Poison detoxification, Excretion of bile
- Fat
- Synthesis of VLDL, Clearance of HDL, LDL
- Proteins
- Vitamins
Protective and Clearance Functions
- Detoxificiation of _____ through the urea cycle
- Detoxification of _____ through microsomal oxidases and conjugation systems
- Synthesis and export of g______
- Clearance of damaged ____ and p_____, h_____, drugs, and activated ____ factors from portal circulation
- Clearance of b_____ and an_____ from the portal circulation
- ammonia
- drugs
- glutathione
- damaged cells, proteins, hormones, clotting
- bacteria, antigens
Overview of Liver Function (Notes)
Energy Metabolism = ____ production, ____ consumption, _____ storage, ch____ and t_____ synthesis (VLDL, HDL), major consumer of ____, oxidation of ___ ____, ____ conversion (used by brain for energy when glucose is unavailable)
Amino Acid and Protein Synthesis
- Critical Function: removes _____ coming from the __ _____
- Large amount of ammonia generated by GI tract predomoninantl by gut _____ consuming amino acids
- Liver converts ammonia into ____ -> some gets eliminated through ____ and some gets _____ to make (1)
- Important bc ammonia is highly _____
- Synthesizes large array of _____ critical for ____ function
- Produces our _____ proteins for ____ function
Glucose production, glucose consumption, glycogen storage, cholesterol and triglyceride synthesis, LDL, fatty acids, ketone
-
removes ammonia from the GI tract
- bacteria
- urea, urine, recycled to make amino acids
- neurotoxic
- proteins for bodily function
- complement proteins for immune function
Overview of Liver Function (Notes)
-
(1) = taking a molecule that is fat soluble and making it water soluble bc fat soluble substances are difficult to control the movement of
- Drug ______
- _____ conjugation: where sugar molecules are added to make it water soluble
- S_____
-
Protective and Clearance functions
- Glutathione: is a critical antioxidant that liver produces to help our bodies do what?
- Clears damaged ___, h____, dr____, b____, and antigens using _____ cells (liver macrophage)
-
Solubilization
- metabolism
- Bilirubin
- Storage
-
Protective and Clearance functions
- neutralizes reactive oxygen species
- cells, hormones, drugs, bacteria, Kuppfer cells
Liver Disorders
Clinical Manifestations of Liver Disease
(4)
Portal Hypertension
Ascites
Hepatic Encephalopathy
Jaundice
Portal Hypertension
=
- Caused by any disease that ____ or impedes blood flow through any component of the portal venous system or the vena cava
- Long term portal hypertension can lead to (or worsen (4)
Abnormally high BP in the portal circulation
- obstructs
- Varices
- Ascites
- Splenomegaly
- Hepatic Encephalopathy
Clinical Manifestations of Liver Disease (Notes)
Liver Failure = becomes _____, scar tissue and collagen
Critical Outcome is (1): probably the most important change that brings about the many other manifestations of lvier failure
- Portal Circulation: portal vein carries blood from GI tract to the liver -> as liver becomes fibrotic, blood flow is impeded and _____ in portal vein increases (usually a _-_ mmHg) -> pressure will ____ or ____ and once it reaches > __ mmHg you start to see pile up of complications
- Complications: varices, ascites, splenomegaly, hepatic encephalopathy as _____ levels rise
fibrotic
Portal Hypertension
- pressure increases (3-5mmHg) -> double, triple, _>_10 mmHg
- ammonia
Varices related to Portal Hypertension
Portal vein, its major tributaries, and the most important shunts (collateral veins) between the portal and caval systems
Normally portal vein is so large and pressure is so ____
As pressure rises, increase in blood flow to ______ circulation
- Superior and inferior mesenteric veins from GI tract leads to (3) places
Low
Collateral
- Portal Vein
- Splenic Vein -> engorges spleen/splenomegaly -> thrombocytopenia/anemia
- Coronary Vein -> engorges veins in the esophagus and stomach (varices) and can bypass liver entirely to drain into vena cava
Takeway: Portal Hypertension directly leads to many of these other manifestations
Varices
Distended and _____ Collateral veins - prolonged elevation in pressure in collateral veins causes their transformation into _____ are most common in (2)
Major clinical completion includes variceal _____
- May cause
- ______ of large volumes of blood
- Blood in ____
- A______
- Hemorrhagic ______
Tortuous, varices, ESOPHAGUS and STOMACH
Bleeding
- Vomiting
- Stool
- Anemia
- Shock
Varices (notes)
Varicose veins = _____, distended, tortuous veins, who often times valves in those veins have _____ -> risk of ____ formation bc you get a lot more blood flow through these veins than you normally see
- Usually ____ esophagus and ____
- Visualization through _____
- Dangerous and can ____ to cause massive hemorrhage
- Slow bleeding results in -> blood going ____ -> found in _____
- If it goes down GI tract, rise in _____ bc GI tract digests blood that has intestinal bacteria -> hepatic _____ which can lead to coma
Takeaway: whether its a slow bleed or alot of bleeding is a medical _____, mortality rate 50-60%
Enlarged, prolapsed valves, clot
- lower esophagus and stomach
- endoscopy
- rupture
- south, stool
- ammonia, encephalopathy
emergency
Ascites
The word ascites is of Greek origin (askos) and means ___ or ____
Ascites describes the condition of pathologic _____ accumulation within the abdominal _____
Ascites traps fluid in a “___ ____” from which it cannot escape
_____ is most common cause
bag or sac
fluid accumulation, abdominal cavity
“third space”
Cirrhosis
Ascites Contributing Factors
(think of ascites as a type of edema disorder):
- (1) increased BP in messenteric circulation
- (1) decreased plasma oncotic pressure
- (1) leads to expansion of plasma volume and increased blood pressure
- Portal Hypertension
- Hypoalbuminemia
- Impaired liver breakdown of ADH and Aldosterone
Ascites (Notes)
Third space =
- ____pleural space, _____ cavity, synovial sacs
- Difficult to get this fluid out compared to other ECP
Tend to see Ascites in 2 contexts
- (1) = can’t produce albumin bc function has decreased
- (1) = liver function but liver can’t produce enough protein bc you’re not consuming enough amino acids
Precipitating cause in fluid accumulation = (1)
Transcellular space surrounded by serous membranes
- interpleural space, abdominal cavity
- Liver Failure
- Starvation
Hypoalbuminemia