Diagnostic Accuracy of IVU Compared to Unenhanced CT KUB for Detection of Urinary Tract Calculi
Objective: To compare the diagnostic Accuracy of IVU to unenhanced CT KUB for detection of urinary tract calculi.
Patients and Methods: This cross-sectional study was carried out at department of Radiology, Aziz Fatimah Hospital Faisalabad, from October 2016 to July 2017. All the patients having suspected Urolithiasis or ureteric colic indicating urolithiasis and referred to the Radiology department for IVU or CT KUB were selected in study sample. All the patients were briefly described about the study and informed written consent was obtained. A sample of 83 suspected patients of urolithiasis were included in the study sample. All patients in study sample who were referred for CT KUB or IVU were offered the other test free of cost. All the information including demographics, IVU and CT KUB were recorded on a predesigned performa. The data was entered and analyzed on SPSS version 21.
Results: There were 48 (57.83%) males and 35 (42.17%) female patients. The mean age of the patients was 46.58 ± 9.42 years, ranging from 25 to 60 years. The final diagnosis showed that there were 59 (71.10%) positive patients for renal or ureteric stone. On the basis of IVU screening test 45 (54.21%) patients were positive, 38 (45.78%) were negative and 21.69% (16/83) patients had inconclusive results. CT KUB diagnosed 58 (69.87%) positive and 25 (30.12%) negative patients. The diagnostic parameters of IVU were considerably poor as compared with the CT KUB having sensitivity (72.08%), specificity (91.67%), PPV (95.56%), NPV (57.89%) and accuracy of 78.31%. The sensitivity, specificity, PPV, NPV and accuracy of 96.61%, 95.83%, 98.28%, 92.00% and 96.39% respectively.
Conclusion: CT KUB provides more efficient information about the patients, presenting with acute renal colic. It has significantly higher rate of diagnosing urolithiasis in comparison of IVU.
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