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Kaplan Qbank USMLE



Author4 Posts
  #1

4 months after cholecystectomy for removal of gall stones, a 40 year old female has recurrent episodes of biliary colic. After endoscopic sphincterotomy, the episodes of colic do not occur. which defects in the sphincter of oddi explains the patients course?

1)inability of smooth muscle to contract
2)release of vasoactive intestinal peptide
3)loss of enteric inhibitory motor innervation
4)reflux of duodenal contents into the common bile duct
5)inability of the enteric nervous system to activate excitatory motoneurons

  #2

Does anyone have the answer to this..I want to say 3...but 5 looks good also

  #3

i say 3. a sphincterotomy is cutting the sphincter so that would imply that the sphincter was contracted before when causing the problems. all other choices point to an open sphincter. 3 implies that sphincter was contracted. but the wording is odd because they use "inhibitory" i iguess they dont mean inhibitory in innervation sense but rather a inhibition of the bile flow. i may be wrong.

  #4

next explanation..

the splincter undegoes fibrosis in CBT stones..







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