Lecture 3- Hepatic Disease Flashcards
Where is the liver located?
upper right quadrant
Largest internal organ:
liver
Describe the blood supply to the liver:
Dual supply
~20% hepatic artery
~80% portal vein
The hepatic artery delivers:
oxygenated blood
The portal vein delivers:
nutrients
Left and right hepatic ducts form the:
common hepatic duct
The common hepatic duct is responsible for:
draining bile from liver and transports wastes from the liver and aids in digestion (by releasing bile)
Carries bile from the liver and the gallbladder thorough the pancreas and into the duodenum:
Common bile duct
Where does the common bile duct carry bile? (pathway)
- liver
- gallbladder
- pancreas
- duodenum
The common bile duct is part of the:
biliary duct system
The biliary duct system is formed where:
the ducts from the liver and gallbladder are joined
Where the ducts and liver and gallbladder join:
biliary duct system (common bile duct is part of this)
the hepatic portal vein goes from the ___ to the ___
GI system to the liver
Drains venous blood from liver to inferior vena cava and on to the right:
hepatic veins
Provides oxygen and nutrition to liver tissues:
hepatic artery
Delivers substances absorbed by the GI tract (stomach, intestine, spleen, & pancreas) for metabolic conversion and/or removal in the liver:
hepatic portal vein
Cells of the liver=
hepatocytes
What is the function of the hepatocytes?
synthesize proteins
Hepatocytes are responsible for synthesizing proteins such as:
- immunoglobulins
- albumin
- coagulation factors
- carrier proteins
- growth factors
- hormones
In addition to synthesizing proteins, hepatocytes also synthesize:
bilirubin
Made from the breakdown of RBCs:
bilirubin
How is bilirubin transported to the liver?
by being bound to albumin in its unconjugated form
considered the unconjugated form of bilirubin:
bilirubin bound to albumin
The liver conjugates bilirubin by unbinding the protein (albumin) & binding it to ____
glucose
Bilirubin + albumin =
Bilirubin + glucose =
UNconjugated form
conjugated form
The hepatocytes produce bile for:
digestion
The hepatocytes produce ____ for fat storage
cholesterol
Bilirubin levels can escalate from:
- blood disorders
- chronic liver disease
- blockage of bile ducts
- Hepatitis (etoH, viral, drug induced)
- cirrhosis
Blood disorders that increase bilirubin levels include:
- hemolytic anemia
- sickle cell anemia
- inadequate transfusions
Increased bilirubin results in:
- jaundice
- fatigue
- cutaneous itch
- discolored urine
- discolored feces
A function of hepatocytes is to regulate ____.
nutrients
Which nutrients are the hepatocytes responsible for regulating?
- glucose
- glycogen
- lipids
- amino acids
Hepatocytes prepare ___ for excretion
drugs
Responsible for drug conjugation and metabolism:
hepatocytes
Types of liver damage include:
- hepatocellular (infiammation and injury)
- cholestatic (obstructive)
- mixed
- cirrhosis (fibrotic, end-stage), acute or crhonic
- neoplastic
Damage of the liver caused by inflammation & injury:
hepatocellular
Damage to the liver caused by obstruction:
cholesstatic
Fibrotic or end-stage liver damage that may be acute or chronic:
cirrhosis
Scarring of the liver in which you start losing hepatocytes:
cirrhosis
T/F: Hepatocellular carcinoma may be an increased risk in patients who have had many viral diseases
true
Signs of liver diseases include:
- jaundice
- ascites
- edema
- GI bleed
- dark urine
- light stool
- mental confusion
- xanthelasma
- spider angiomas
- palmar erythema
- asaterixis
- hyperpigmentation
Symptoms of liver disease include:
- appetite loss
- bloating
- nausea
- RUQ pain
- fatigue
- mental confusion
What is both a sign and symptoms of liver disease?
mental confusion
What is seen in the following image?
Fatty cholesterol deposits in the skin that is a good indicator the patient has some sort of liver disease
xanthelasma
What is seen in the following image?
spider angiomas
Capillary fragility seen in the skin due to lack of clotting factors; increased peripheral endothelial vasculature:
spider angiomas
When liver is not metabolizing ammonia from the body, (usually converts ammonia to ammonium so it can be excreted), the ammonia builds up, getting to the brain and causes:
asterixis
Asterixis is also known as:
flapping tremor
What is a classic sing of hepatic encephalopathy (HE)
asterixis
Described asterixis:
jerky movements when the hands are extended at wrists
What can be seen in the following image?
asterixis
Sign associated with poor ammonium metabolism:
Asterixis
A syndrome of altered neurologic function related to dysregulation of metabolism seen almost exclusively in patient with severe liver disease:
Hepatic encephalopathy (HE)
HE can be a chronic problem in patients with ___, managed medically to varying degrees of success, punctuated with occasion exacerbations
cirrhosis
T/F: Although acute exacerbations of HE are rarely fatal, they are a frequent cause of hospitalizations among patients with cirrhosis
True
What are some blood test that determine general liver function:
- CBC
- CMP (comprehensive metabolic panel)
List some SPECIFIC liver function tests:
- lipid panel
- VDRL
- PSA (prostate specific antigen)
- SARS antigen & antibody
- HIV
- HEP B
- Bleeding times
Test that evaluates the cells that circulate in the blood:
CBC
What cells are evaluated on a CBC?
- RBCs
- WBCs
- PLTs
A CBC is an indicator of:
overall health
A CBC may detect a variety of diseases and conditions including:
- infection
- anemia
- leukemia
- lymphoma
- neutropenia
CMP:
Comprehensive metabolic panel
A CMP may also be called:
chemical screen or SMAC 14 (sequential multiple analysis - computer)
A CMP consists of ___ blood tests which serve as:
14 blood tests; initial broad medical screening tool
A CMP includes:
- general tests
- kidney function assessment
- electrolytes
- protein tests
- liver function assessment
Why are CMPs (chemical screen/SMACs) a good general test for the patients overall health?
Because they look at multiple organ systems
In terms of assessing liver function, the following proteins are good indicators of liver health:
- bilirubin
- alkaline phosphatase (ALP)
- Transaminases
- albumin
- globlulin
Bilirubin is a product of:
heme breakdown
Increased total bilirubin = increased:
severity of liver injury
bilirubin that is insoluble, bound to albumin, not filtered by kidney:
unconjugated (indirect)
T/F: With unconjugated bilirubin, increased SERUM is not really indicative or liver disease
True
Form of bilirubin that indicates hemolysis, ineffective erythropoiesis (thalassemia, vitamin B deficiency, Gilbert syndrome)
unconjugated (indirect)
T/F: With conjugated bilirubin, increased SERUM levels is NOT really indicative of liver disease
False- this is indicative of liver disease
The form of bilirubin that is water soluble and excreted by the kidney:
conjugated (direct)
All ____ bilirubin is conjugated
urine
A protein involved with bone metabolism that is not specific to liver disease but may indicate cholestatic disease
Alkaline phosphatase (high)
This protein is altered in multiple disease conditions, but especially bone neoplasms:
alkaline phosphatases
AST, ALT, and GGT are all:
transaminases (liver enzymes) needed for protein synthesis & specific to liver function
High levels of transaminases (AST, ALT, GGT) indicates:
damage to hepatocytes from hepatocellular disease
T/F: High levels of transaminases (AST, ALT, GGT) are individually proportionally reflective of severity of liver damage
False- not individually proportionally reflective
What transaminase is more indicative of cholestatic disease (blockage) and alcoholic liver disease?
GGT
AST: ALT ratios are more informative; the ____ the ratio, there specific an indicator of hepatic disease
lower
Synthesized exclusively by hepatocytes:
Albumin
What is the half life of albumin?
18-20 days
Hypoalbuminemia is more indicative of ____ but not specific to ____
chronic liver disease; liver disease
Hypoalbuminemia is not specific to liver disease as it is also involved in:
- malnutrition
- chronic infection
- gut disease
What are two liver function tests?
- albumin
- prothrombin time
The prothrombin time test measures;
extrinsic & common pathway
The liver produces all coagulation factors except for:
VIII (vascular endothelial cells)
PT measures factors:
1, 2, 5, 7, 10
What are the vitamin K dependent coagulation factors?
2, 7, 9,10
INR is actually
PT INR
What are the 4 A’s that are measured on a CMP?
- albumin
- alkaline phosphatase
- ALT
- AST
What is the B that is measured on a CMP?
BUN
What are the 4 C’s that are measured on a CMP?
- calcium
- chloride
- CO2
- creatinine
What is the G measured on a CMP?
Glucose
What is the P measured on a CMP?
Potassium
What is the S that is measured on a CMP?
Sodium
What are the two Ts measured on a CMP?
- Total bilirubin
- Total protein
All hepatitis viruses are RNA viruses except for ____ which is an enveloped DNA virus
Hep B (HBV)
Where does the hepatocellular damage from hepatitis viruses come from?
host immune response to viral antigens (rather than direct cytopathic effect from virus)
(think of this like an autoimmune disease)
List some components of viral hepatitis that cause hepatocellular damage: (think about the host response)
- cytotoxic T-cells
- Proinflammatory cytokines
- NK cell response
- Antibody-dependent cellular cytotoxicity
Viral hepatitis infection may be ___ /___ and ___/___
asymptomatic or symptomatic; acute or chronic
Chronic hepatitis can lead to:
- cirrhosis
- liver failure
- hepatocellular carcinoma
What is the risk factor for hepatitis leading to hepatocellular carcinoma?
immunosuppression
T/F: A patient with hepatitis can have a chronic infection yet be asymptomatic deeming them in the carrier state (low levels)
true
Viral hepatitis is also called _____, and is a ____ pathogen
serum hepatitis; blood-borne
Describe the transmission of viral hepatitis:
- parenteral
- intimate
- sexual
The hep B virus can last up to ___ on an infected surface
7 days
What is the incubation period for Hep B?
90 days average
Describe the chronicity of Hep B:
- 90% infants
- 25-50% 1-5
- Less than 5% adults
Is there a vaccination for hep B? If so describe
Yes- 3 doses (1 initial, 1 month, 6 months)
For the Hep B vaccination, seroconversion is necessary meaning:
your body has to have time to develop specific antibodies as a result of immunization
In the chronic state of Hep B, the ___ is always present in the body
surface antigen
What is another name for hep C?
cytomegalovirus
Dentistry has adopted the ___ against blood borne diseases which has dramatically decreased the incidence of viral spread
universal/standard precautions
Patients with chronic hep C must stay on ___ for a long time
immunosuppression drugs
Hepatitis virus where the average prevalence in injection drug users is 53%
Hep C
What population should be screened due to a higher risk of having the hep C virus?
baby boomers
___% of untreated hep C patients are able to clear the virus
15-25%
Hep C has a high risk for becoming ____ (75-85%)
chronic
10-20% of patients who have chronic hep C develop:
cirrhosis (takes 20-30 years)
Patients who have chronic hep C are at an increased risk for: (2)
- hepatocellular carcinoma (HCC)
- death
T/F: HIV has a higher needle stick transmission rate than HCV
False- HCV higher
Is there a vaccine for Hep C? If so describe
No
What is considered a “cure” for HCV?
undetectable HCV RNA levels after 12 weeks of recommended protease inhibitor therapy
List some examples of the protease inhibitor therapy (immunosuppression drugs) used to treat hep C:
- Mavyret
- Epclusa
- Harvoni
T/F: There are chronic carriers associated with hep C
True
Form of hepatitis that usually presents coinfection with Hep B:
Hep D (HDV)
Compare the severity of Hep B versus Hep B+D
Hep B+D is more severe than Hep B alone
With Hep D, one is at risk for ____ which results in:
fulminant hepatits; massive hepatocellular destruction
What hepatitis viruses are considered blood borne?
Hep B, C, D
What hepatitis viruses are considered fecal-oral borne?
Hep A & Hep E
Infectious hepatitis, fecal-oral transmission:
Hep A & E
Hep A and Hep E are considered highly ___ & ___
contagious and transmissable
Is there a vaccine for Hep A or Hep E? If so describe:
Yes for hep A; not for hep E
T/F: Most carries of HBV, HCV, and HDV are unaware they have hepatitis
True
T/F: Hepatitis can be contracted by the dentist from an infected patient
True
Chronic, active hepatitis patients may have chronic liver dysfunction such as:
- increased bleeding
- altered drug metabolism
Hep ___ is the most likely viral hepatitis to be transmitted occupationally to a dental health care worker followed by Hep ___.
Hep B; Hep C
T/F: There is little to no risk exists for transmission, for HAV, HEV, and non-A-E hepatitis viruses
True
When we consider ALL patients infectious:
Universal precautions
If active hep disease status, a risk for dental care in patients with hep virus is:
they likely are not making the blood clotting factors
How would you respond to the following situation?
Patients with ACTIVE hepatitis (acute or chronic)
- defer all elective dental treatment
- if emergency treatment
- consult physician
- determine severity of disease
- determine dental treatment risk
- consider referral to specialized center
- isolation may be necessary
How would you respond to the following situation?
Patients with history of hepatitis (resolved, chronic inactive)
- consider risk factors
- consult physician to determine liver status
How would you respond to the following situation?
Needle stick
- consult the physician
- consider hepatitis B immunoglobulin
What are some viral hepatitis oral manifestations?
- bleeding
- mucosal jaundice
- glossitis
- angular cheilosis
What is an oral manifestation we may see in a patient with chronic HCV?
- oral lichen Plans
- lymphocytic sialadenitis
An oral manifestation of hepatitis viruses that is usually part of the immune suppression from the lack of production of immunoglobulins that presents clinically as a fungal or bacterial infection at the corners of the mouth:
angular cheilosis
Viral hepatitis oral manifestation in which the patient has enlarged parotid glands (Sjogren-like syndrome). What is this due to?
Lymphocytic sialodenitis; lymphocytic infiltration and edema in the parotid glands
Type of hepatitis in which there is no virus inducing the response:
autoimmune hepatitis
What is the cause of autoimmune hepatitis?
Idiopathic
Autoimmune hepatitis is more severe in what population?
children
What is one of the main contributors to drug induced liver disease?
alcohol
List some mechanisms that result in drug-induced liver disease?
- DIRECT toxicity to hepatocytes
- Production of hepatotoxic metabolites
- Accumulation of drug due to altered metabolism
Degeneration of the liver caused by atrophy of hepatocytes; where scarring and connective take over the liver:
Non-alcoholic fatty liver disease (not caused by drugs or alcohol)
alcohol and its metabolite are :
hepatotoxic
alcohol causes ____ which compounds the liver damage
inflammation
It typically takes ___ of excessive alcohol intake to develop alcoholic liver disease
10 years
What is the first stage of alcoholic liver disease? Describe
Patients first develop fatty liver disease; reversible
When a patient has developed fatty liver disease from alcohol and continues alcohol use, this can lead to:
irreversible changes & necrosis (due to persistent inflammation)
Once a patient has reached the stage of irreversible changes and necrosis of the liver due to alcohol use and continues alcohol use, eventually ____ & ____ develop which is irreversible and leads to ____.
fibrosis & cirrhosis; hepatic failure
Complications of alcoholic liver disease include:
- bleeding tendencies
- unpredictable drug metabolism
- impaired immune function
- peripheral neuropathies
- dementia & psychosis
- anorexia
Complications of cirrhosis (due to alcohol) include:
- ascites
- esophageal varices
- jaundice
- hepatosplenomegaly
- coagulation disorders
- hypoalbuminemia
- anemia
- neutropenia
- encephalopathy
Describe ascites:
hepatorenal syndrome (beer belly appearance)
Describe esophageal varices:
GI bleed
Describe hepatosplenomegaly:
- enlarged spleen due to portal hypertension
- decreased platelet function
- leads to thrombocytopenia
Describe the coagulation disorders associated with cirrhosis (alcohol induced)
- decreased synthesis of clotting factors
- impaired clearance of anticoagulations
- decreased vitamin K absorption
VItamin K absorption requires:
biliary excretion
Describe the anemia that is a complication of cirrhosis (alcohol induced):
- iron deficiency
- macrocytosis
Describe encephalopathy that is a complication of cirrhosis (alcohol induced):
Neurotoxins not removed from the liver
How might you identify a patients alcoholism?
- history
- clinical examination
- detection of odor on breath
- suspicious behavior
- info from family/friend
What is the BEST way to identify a patients alcoholism?
history
What is a problem for the dentist with a patient who has early on/mild liver dysfunction caused by alcohol?
Liver enzyme induction may increase metabolism of prescribe drugs, limiting their effect
What is a problem for the dentist with a patient who has early on/mild liver dysfunction caused by alcohol?
Drug metabolism may conversely be hindered and drug toxicity is a concern
In many chronic liver diseases, the ratio of AST: ALT is ___ where as in alcoholics the ratio of AST: ALT is much _____
low; higher
What is the AST: ALT ratio in a patient with alcoholism?
Greater than or equal to 2
A patient presents with AST: ALT ratio of 2.4 and an elevated GGT. What might you suspect?
alcoholic liver disease
Total protein-
Hepatitis:
Cirrhosis:
Hepatitis: Normal
Cirrhosis: Decreased
Albumin-
Hepatitis:
Cirrhosis:
Hepatitis: Normal
Cirrhosis: Decreased
Globulin-
Hepatitis:
Cirrhosis:
Hepatitis: Normal
Cirrhosis: Increased
A/G Ratio
Hepatitis:
Cirrhosis:
Hepatitis: greater than 1
Cirrhosis: Less than 1
Alkaline phosphatase-
Hepatitis:
Cirrhosis:
Hepatitis: elevated 1-2 times normal
Cirrhosis: elevated 1-2 times normal
ALT-
Hepatitis:
Cirrhosis:
Hepatitis: Values increased into the thousands
Cirrhosis: ALT, AST are increase up to a maximum of 300 IU
AST-
Hepatitis:
Cirrhosis:
Hepatitis: values increased to the thousands but ALT is ALWAYS greater than AST
Cirrhosis: NEVER greater than 300 IU AST is always greater than ALT
Alcoholic liver disease oral manifestations include:
- neglect
- bleeding
- ecchymoses
- petechiae
- glossitis
- angular cheilosis
- alcohol odor
- parotid enlargement
- xerostomia
A patient with jaundice mucosal tissues and a breath that is ___ & ___ is associated with liver failure
sweet & musty
Alcohol is a STRONG risk factor for:
oral squamous carcinoma
_____ is the number one abused drug in terms of ER visits, hospital admission, family violence and social problems
alcohol abuse
Laboratory tests may be needed to evaluate the fitness of the patient for dental treatment(s). If we suspect liver disease, what lab tests may we order?
- CBC with differential (this includes platelets)
- Liver function test which includes
- AST
- ALT
- GGT
- Albumin
- Alkaline phosphatase
- Bilirubin
T/F: In a patient with significant liver disease SRP should be done one quadrant at a time, not the full mouth.
False- SRP should be one tooth at a time rather an entire quadrant
In a patient with significant liver disease, what should you avoid post-op?
NO NSAIDS for pain management
In a patient with significant liver disease, what CAN you recommend post-op for pain control?
acetaminophen up to 2g daily
T/F: Antibiotic prophylaxis prior to dental procedures is NOT required if no oral infection is present in a patient with liver disease. Patients with SEVERE LIVER DISEASE may need antibiotic prophylaxis for invasive/surgical procedures due to decreased immune function.
Both statements true
For patients with liver disease, you should minimize use of drugs metabolized by the liver. These drugs include:
- local anesthetic
- analgesics
- sedative
- antimicrobials
What is a concern with local anesthetics in patients with liver disease?
Local anesthetics are not metabolized properly by the liver and may result in encephalopathy
What may be a better option as opposed to amide anesthetics in a patient with liver disease?
Ester anesthetics (but can be hard to find & not as long last for pain control)
Opioids can be used if necessary for post-op pain control in a liver diseased person. Which ones would we avoid? Which should we prescribe?
AVOID: hydrocodone & oxycodone
PRESCRIBE: Hydromorphone
What sedatives should be avoided in a person with liver disease? Which are acceptable?
AVOID: benzodiazepines
Potentially use: Lorazepam due to its shortened half life
N2O is a safer option if possible
What antimicrobials should be avoided in a person with liver disease? Which are acceptable?
AVOID: Metronidazole, Tetracycline, Doxycycline, Fluconazole – these get broken down in liver
Possible issue with: Clindamycin
Disulfiram effect:
antimicrobial alcohols take to make them violently ill with alcohol
Type of hypertension that is a complication with cirrhosis:
portal hypertension
What is significantly elevated with portal hypertension?
BP
With portal hypertension, ___ should be limited as well as no use of retraction cord with ____.
Epi; Epi
Why do we see thrombocytopenia with portal hypertension?
due to platelet sequestration in the spleen
What risk ratio should we weigh when deciding to prescribe antibiotics prophylactically
impairment of drug metabolism vs. immune impairment
T/F: Antibiotic prophylaxis is a consideration in a patient with liver disease
True