One method of getting rid of gallstones is to dissolve them by the infusion of a solvent directly into the gallbladder. How is the catheter inserted into the gallbladder so gallstones can be dissolved?
A) Percutaneously
B) Surgically
C) Transrectally
D) MTBE
Ans: A
Feedback: Several methods have been used to dissolve gallstones by infusion of a solvent (mono-octanoin or methyl tertiary butyl ether [MTBE]) into the gallbladder. The solvent can be infused through the following routes: through a tube or catheter inserted percutaneously directly into the gallbladder; through a tube or drain inserted through a T-tube tract to dissolve stones not removed at the time of surgery; endoscopically with ERCP; or via a transnasal biliary catheter. Opening the patient surgically to place a catheter to dissolve gallstones is redundant as the stones can be removed through the surgical incision. A tube passed transrectally would not be placed into the gallbladder as the risk of infection is too high. MTBE is the drug used to dissolve the stones, not the route of the catheter.
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