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The Natural History of Cholelithiasis: The National Cooperative Gallstone Study

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The Steering Committee of the National Cooperative Gallstone Study consists of R.A. Baum, R.L. Habig, R.F. Hanson, T. Hersh, N.C. Hightower, Jr., A.F. Hofmann, J.M. Lachin, E.C. Lasser, J.W. Marks, H. Mekhjian, R. Okun, R.A. Schaefer, LJ. Schoenfield, L. Shaw, R.D. Soloway, J.L. Thistle, F.B. Thomas, and M.P. Tyor.

Presented in May 1982 at the annual meeting of the American Gastroenterology Association.

▸Requests for reprints should be addressed to Johnson L. Thistle, M. D.; Mayo Clinic, 200 First Street S.W.; Rochester, MN 55905.

THE STEERING COMMITTEE; and THE NATIONAL COOPERATIVE GALLSTONE STUDY GROUP, Rochester, Minnesota; Washington, D.C.; Durham, North Carolina; and Atlanta, Georgia

©1984 American College of PhysiciansAmerican College of Physicians

Ann Intern Med. 1984;101(2):171-175. doi:10.7326/0003-4819-101-2-171
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The National Cooperative Gallstone Study, a doublemasked, placebo-controlled, therapeutic trial of Chenodiol (chenodeoxycholic acid), provided an opportunity to study the natural history of cholelithiasis in patients who choose nonsurgical management. The major component of the study comprised 916 patients, 305 of whom were randomly assigned to receive a placebo for 24 months. Among these 305 patients, the probability of having biliary tract pain during the 24 months of prospective evaluation was significantly increased if the patient had had a history of biliary tract pain in the 12 months before entry into the study (69% versus 31%). Thirty-eight percent of patients had stone growth ( > 0.5 cm3), and 18% had a spontaneous decrease in stone volume. Despite the high incidence of biliary tract pain, nonelective cholecystectomy was required in only 4% of patients during the 24 months.





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