GI mix

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Anonymous
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174830
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GI mix
Updated:
2012-10-01 20:26:15
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usmlemix
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GI
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  1. Adverse effects of protease inhibitors?
    Hyperglycemia, Cushings, lipodystrophy, inhibition of cytochrome P450s. 
  2. Giardia - MoA and in what patients?
    Adheres to duodenum and jejunem brush border, occurs with IgA deficiency
  3. Brunner's glands location?
    Submucosa of the duodenum - secretes alkaline fluid.
  4. Histo of acute viral hepatitis? Causes?
    Ballooning degeneration (hepatocyte swelling), mononuclear infiltrate and Councilmann bodies (eosinophilic apoptotic hepatocytes)
  5. Histo of chronic viral hepatitis? 
    Nodular regeneration; Hep B and C
  6. Longitudinal mucosal tears at the GE junction due to what mechanism?
    Mallory-Weiss tears due to increased abdominal pressure (e.g. vomiting, retching, hiatal hernias)
  7. Urease breaks down urea into?
    CO2 and NH3. 
  8. MoA of Zenker's diverticulum? 
    • Cricopharyngeal motor dysfunction: diminished relaxation of pharyngeal muscles when you swallow. Increased intraluminal pressure backflow causes mucosa to herniate at a point of muscle weakness. 
    • False diverticulum: only mucosa herniates
  9. What does southwestern blotting detect and type of probe?
    DNA-binding protein (e.g. c-jun and c-Fos) and ds DNA antibodies.
  10. Intraabdominal abscess organisms?
    Anaerobes: B. fragilis and E.coli
  11. Where does the pentose phosphate pathway occur?
    Cytoplasm
  12. Mechanism of acute cholecystitis? 
    Due to obstruction of the gallbladder neck or cystic duct. Stones disrupt the mucus layer, prostaglandins are released and hypomotility occurs. Increased pressure in gallbladder causes ischemia = necrosis prone to bacterial inflammation.
  13. Ketones yield energy when they are converted to acetyl coA. What two tissues cannot use them?
    • 1. RBCs - dont have mitochondria
    • 2. Hepatocytes - dont have succinyl-coA-acetoactate coA to convert acetoacetate to acetoacetyl coA. 
  14. How can Hep A be inactivated?
    • water chlorination
    • bleach
    • irradiation
    • boiling for 1 min
    • formalin
  15. Bioavailability of a drug IV? Bioavailability of a drug orally?
    • =1,
    • <1 as affected by gastric secretions, food, saliva, absorption, metabolism by liver

    F = area under drug given orally/area under drug given IV

    If not equal rates: F = area of oral drug x IV dose/area of IV drug x oral dose
  16. Hepatic encephalopathy?
    Increased NH3 in the gut, cannot enter liver through portal vein to detoxify into urea due to liver damage - decreased levels of BUN
  17. MoA of cholestrol stone in a preggo?
    • Estrogen upregulates HmG-coA reductase acitvity causes an increase in cholestrol. 
    • Progesterone decreases bile acid secretion and slows gallbladder emptying. More cholestrol than bile and/or decreased motility forms stones. 
  18. mcc of gallbladder hypomotility?
    Bile precipitation 
  19. Cephalic phase?
    vagal stimuation; triggered by the thought, sight, smell, and taste of food.
  20. Gastric phase? 
    • Gastrin stimulation
    • Triggered by food and distention of the stomach
  21. Intestinal phase
    • Inhibits acid secretion
    • 1) Ileum and colon release peptide YY - binds to endocrine, histamine-containing cells known as ECL (enterochromaffin cells)
    • 2) Somatostatin
    • 3) Prostaglandins
  22. Enzyme promoting colonic adenoma development? 
    CoX-2
  23. Long term treatment to help for peptic ulcer dz?
    Antibiotics if cause by H.pylori.
  24. MoA of hemachromatosis?
    HFE gene encodes an HLA class I molecule that impairs iron absorption from the GI tract
  25. Histo of GERD
    • Basal zone hyperplasia
    • Elongation of lamina propria papillae
    • Inflammatory cells (eosinophils, neutrophils, lymphocytes)
  26. Crohn's disease associated with what TF?
    NOD2 mutation increases NF-kB - cytokine production
  27. HOX genes encode what proteins?
    TF - morphogenesis (proper placement of limbs)

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