Medical Health Encyclopedia

Investigative Agents. Fatty acid bile acid conjugates (FABACs) are experimental agents that are being investigated for dissolving gallstones and also for preventing gallstone formation.

Extracorporeal Shock Wave Lithotripsy

Gallstone fragmentation by extracorporeal shock wave lithotripsy (ESWL) may be an appropriate therapy for some patients who cannot undergo surgery but it is not commonly used anymore. The treatment works best on solitary stones that are less than two centimeters in diameter. Less than 15% of patients are good candidates for lithotripsy. The typical procedure is as follows:

• The patient typically sits in a tub of water.
• High-energy, ultrasound shock waves are directed through the abdominal wall toward the stones.
• The shock waves travel through the soft tissues of the body and break up the stones.
• The stone fragments are then usually small enough to be passed through the bile duct and into the intestines.
• Lithotripsy is generally combined with oral dissolution (bile acid) treatment to help dissolve the fragmented pieces of the original gallstone.

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Complications. Although the mortality rate for lithotripsy is essentially zero, complications include pain in the gallbladder area and pancreatitis, usually occurring within a month of treatment. In addition, not all of the fragments may clear the bile duct. Adding erythromycin to the treatment regimen may help remove these fragments. About 35% of patients who are left with fragments are at risk for further problems, some severe. The chance of recurrence is high with this procedure, and in one study, 45% of patients eventually required surgery. Elderly people may have a lower risk for recurrence than younger adults, which may make this a good choice for some.