Exam 3 Liver Disorder Flashcards
The liver is
Largest solid internal organ 1600g (3.5 lbs)
Falciform ligament divides into
R and L lobes (abd. wall)
Round ligament is the
“ Ligamentim Teres” (umbilicus)
Coronary ligament
diaphragm
Liver receives
25% of C.O.
How much blood comes from the Hepatic artery?
400ml from Hepatic Artery
How much blood comes from the Hepatic Portal vein
1000ml from Hepatic Portal Vein
Liver is covered by the
Covered by “Glisson capsule” –painful when distended in disease/inflammation
Filters blood for infections
Kuppfer cells, NK cells)
Liver and toxins
Neutralizes toxins
Liver and Bilirubin
Metabolizes Bilirubin from heme
Liver metabolizes nutrients
(Protein deamin.NH3 to Urea)
Liver and clotting
Synthesizes Prothrombin& clotting factors 7,9,10
Liver and hormones
Synthesizes Hormones(angiotensinogen, thrombopoietin, IGF-1, hepcidin)
Liver and cholesterol
Synthesizes Cholesterol, lipids, lecithin
Liver and bile
Synthesizes bile
Liver Stores:
Glycogen
Fe
Cu
Vit.A, K, E, D, B12
**Acute Liver Failure
Leading cause
Severe impairment or necrosis of liver cells without preexisting liver disease or cirrhosis
Pathophysiology of Acute Liver Failure (HPN)
Hepatocyte edema
Patchy areas of necrosis and inflammatory cell infiltrates disrupt parenchyma.
Necrosis irreversible.
**Acute Liver Failure
Clinical/lab manifestations AVAPHC RAP
Anorexia Vomiting Abdominal pain Progressive jaundice Hypoalbuminemia Coagulopathy Renal dysfunction Altered Mental Status Prolonged Prothrombin Time
**Portal Hypertension
Abnormally high blood pressure in the portal venous system / Increase to at least 10 mmHg (normal = 3 mmHg)
**Signs and symptoms of portal HTN (HAC)
Hematemesis, Ascites, Caput medusae
**Portal Hypertension-Types Three Types:Pr
Prehepatic Intrahepatic Post-hepatic
**Portal Hypertension-Types
Three Types: Prehepatic
Portal vein thrombosis
**Portal Hypertension-Types
Three Types: Intrahepatic
Fibrosis: cirrhosis, hepatitis, schistosomiasis (CHS)
**Portal Hypertension-Types
Three Types: Posthepatic
Post-hepatic (Hepatic vein thrombosis or Right CHF)
**Portal Hypertension Consequences (HP-VAHS)
Hepatopulmonary Syndrome Portopulmonary Hypertension Varices (Lower esophagus, stomach, rectum •Life threatening if ruptured) Ascites Hepatic Encephalopathy Splenomegaly
***Portal Hypertension : What happens with splenomegaly
Splenomegaly ->Thrombocytopenia: (↓thrombopoietin from liver and) platelet sequestration in spleen = Increased risk for bleeding
***Hepatopulmonary Syndrome : liver has
Liver has ↑production, or ↓clearance of vasodilators
***Hepatopulmonary Syndrome Pathophysiology
Causes V/Q mismatch in lungs
RBCs pass too quickly through lungs to exchange O2 = Hypoxemia and SOB
Perfusion adjustment to changes in ventilation
Response to reduced ventilation
Decreased airflow Reduced PaO2 in blood vessels Vasoconstriction in pulmonary blood vessels Decreased blood flow Blood flow matches airflow
Perfusion adjustments to changes in ventilation
Response to increased ventilation
Increased airflow Elevated PaO2 in blood vessels Vasodilation in pulmonary blood vessels Increased blood flow Blood flow matches airflow
***Hepatopulmonary Syndrome
Clinical manifestations:
- dyspnea that worsens moving from recumbent to upright position (“platypnea”)
- Clubbing of the fingers
- Spider angiomata
***Portopulmonary Hypertension Portal HTN leads to
Pulmonary HTN
Right sided HF
***Portopulmonary Vasoconstrictors and cirrhosis
↑↑↑in cirrhosis (endothelin“ET-1”) Causes vasoconstriction in lungs
***Portopulmonary Serotonin normally metabolized
Serotonin normally metabolized in liver
bypasses diseased liver in Portal HTN –acts on lungs Causes vascular smooth muscle hypertrophy/hyperplasia
***Mean PA pressure and portopulmonary HTN
> 25mmHg (normal ~ 14mmHg) Mean PA >50 contraind. for surgery
***Portal Hypertension Treatment
No definite treatment
Beta-blockers help prevent variceal bleeding
Bleeding varices:
***Treatment for bleeding Varices–> PEF
Fluid Resuscitation
•prophylactic antibiotics
vasoactive drugs (nonselective β-blockers and terlipressin-reduces portal vein pressure and increases mean arterial pressure (MAP))
•Endoscopic variceal band ligation, compression of the varices with an inflatable tube or balloon, and injection of a sclerosing agent
**Ascites: what is it?
Accumulation of fluid in the peritoneal cavity
Most common cause of Ascites
Cirrhosis
Clinical manifestations of Ascites
Abdominal distention
Ascites Evaluation
Serum-ascites albumin gradient (SAAG):
Most specific diagnostic indicator
***•SAAG for Ascites
(serum albumin) -(albumin level of ascitic fluid)
•Normal SAAG
<1.7
•In cirrhosis, what happens to hydrostatic pressure?
hydrostatic press. ↑↑↑= more water pushed out of vasc. space into peritoneum. Albumin doesn’t cross easily, concentrating serum albumin.
•Results in Higher SAAG
Ascites on Respiratory
10 –20 L fluid displaces diaphragm Causes dyspnea& ↓lung capacity
Ascites on Renal
Affects renal function -leads to H2O retention and dilutional hyponatremia
K+ sparing diuretics used
Ascites Fluid removed?
1-2 L removed via paracentesis relieves respiratory distress
**Ascites -> Removing too much fluid too fast
relieves pressure on blood vessels = hypotension, shock, death
Overflow theory
Renal sodium retention is stimulated by portal hypertension
Causes intravascular hypervolemia, which
overflows or “weeps” into the peritoneal cavity
Underfill Theory
Hepatic sinusoidal hydrostatic pressure increases, and plasma oncotic pressure
decreases
Causes weeping of the lymph fluid from the surface of the liver
Peripheral Arterial Vasodilation theory or Forward Theory
PICI
Is the synthesis of the overflow and underfill theories
Is the most accepted theory
Portal hypertension and splanchnic vasodilation occurs
Causes fluid transudation and lymph formation, producing ascites
Ascites – Medical Treatment diet
Dietary salt restriction
Medication management for Ascites
Potassium-sparing diuretics
Strong diuretics, such as furosemide or ethacrynic acid
For dilutional hyponatremia
Vasopressin receptor 2 antagonists:
Other additional management for Ascites
Possible administration of albumin
Monitor serum electrolytes, especially sodium and
potassium
Ascites – Surgical Treatment
Transjugular intrahepatic portosystemic shunt OR
peritoneovenous shunt →For refractory ascites
Ascites: Best treatment option
Liver transplant
Hepatic Encephalopathy
Blood shunted around failing diseased Liver.
***What happens with hepatic encephalopathy
Neurotoxic NH3 from intestinal protein digestion, normally converted to urea by liver, circulates to Brain
disrupting neurotransmission and increases intracranial
hypertension.
***Clinical manifestations of Ascites
SAM PC
◘Personality changes ◘Confusion ◘Memory loss ◘Asterixis (flapping tremor) ◘Stupor, coma, death
Hepatic Encephalopathy Treatment
Correct fluid and electrolyte imbalances
Withdraw depressant drugs metabolized by liver
↓ dietary protein intake
↓ intestinal bacteria
Hepatic Encephalopathy and intestinal bacteria
• Neomycin (sterlizes bowel) • Rifaximin ( ↓ intestinal NH3 production/absorption) • Sodium benzoate & L-ornithineL-aspartate (detoxify NH3)
Medication to decrease intestinal bacteria: Neomycin action
Sterilizes bowel
Medication to decrease intestinal bacteria: Lactulose action
prevents NH3 absorption from colon
Medication to decrease intestinal bacteria: Rifaximin action
↓ intestinal NH3 production/absorption)
Medication that decrease intestinal bacteria by detoxifying NH3
Sodium benzoate and L-ornithineL-aspartate (detoxify NH3)