USMLE 25

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Author:
rere_girl4ever
ID:
294346
Filename:
USMLE 25
Updated:
2015-01-30 20:08:23
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USMLE 25
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USMLE 25
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USMLE 25
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  1. What is confounding bias?
    Part of the exposure-disease relationship can be explained by another variable.
  2. Matching helps to control which type of bias?
    • Confounding bias
    • Matching- Use groups that have similar distribution in accordance with the variables (gender, race, age, smoking status)
  3. Describe the pathogenesis and clinical presentation of a gallstone ileus.
    • 1. Gallstone obstructs cystic duct
    • 2. This causes a fistula to be created between the gallbladder and small intestine. 
    • 3. Gallstone passes through the fistula and becomes lodged in ileocecal valve.
    • 4. Intestinal gas backs up into the gallbladder and biliary tree.

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