بررسی‌ حساسیت و ویژگی اولتراسونوگرافی در تشخیص سنگ‌های مجرای صفراوی مشترک در مقایسه با کلانژیوگرافی حین عمل

Introduction: Cholelithiasis is a common disease. Since about 10 to 15 percent of choletithiasis patients have CBD (Common Bile Duct) stone as well as, the detection of CBD stone seems crucial in these patients. Regarding to cholodocholithiasis, the stone is extracted by ERCP (Endoscopic Retrograde Cholangio Pancreatography) and then, cholecystectomy is performed. The remaining CBD stone may cause serious complications after cholecystectomy. Thus, the sensivity of ultrasonography has become a controversial issue for detecting the sensivity and specificity of ultrasonography in diagnosing CBD stone. Objective: In this study the sensivity of ultrasonography in diagnosing CBD stones was investigated as compared to the common method of I.O.C (Intra Operative Cholangiography). The mentioned indicators and T-test were also applied to obtain minor goals. Materials & Methods: Ultrasonography was performed on 170 choletithiasis patients before L.C (Laparoscopic Cholecystechtomy). Then, blood level of T-Bill. (Total Bilirubin), D-Bil (Direct Bilirubin), Alk-P (Alkaline Phosphatase) SGOT, and SGPT were measured. Later on, cholangiography was carried out for all samples during L.C. Data were analyzed using SPSS software. Thus, the sensivity and specificity of ultrasonography were determined by using evaluating indicators of predicting the whole test. Results: The sensivity, specificity, positive predictive value and negative predictive value of ultrasonography were 30.3%, 24.2%, 55.6% and 84.9%, respectively. The blood level of Alk-P, and T-Bil (p<.05) increased significantly in case that CBD stone was existed. While, there was a negative correlation for SGOT and SGPT. Conclusion: Due to the insignificant results obtained from ultrasonography in detection of CBD stone, it can be concluded that mere negative findings of ultrasonography can not rule out the existence of the stone. I-OC is also recommended to make us certain about the stone. A further study in future seems crucial to compare the complications of remained CBD stone to those of cholangiography.