Objectives: The objective was to determine accuracy of ultrasound in thediagnosis of ureteric calculi confirmed on non-contrast Computed Tomography amongpatients with acute ureteric colic. Study Design: Cross-sectional study. Setting: EmergencyDepartment of Nishtar Hospital, Multan. Period: 11-07-2012 to 10-01-2013. Materials andMethods: 100 consecutive patients presenting with acute severe ureteric colic and fulfillingthe inclusion and exclusion criteria were enrolled for the study from the emergency departmentof Nishtar Hospital Multan. Ultrasonography was done in all patients and USG findings wererecorded for the presence or absence of hyperechoic shadows in the ureteric. All the patientsunderwent CT scan to confirm or refute the findings of Ultrasonography. Result: Mean age ofthe patients was 37.85 + 12.60 years. Males were 53 (53%) while females were 47 (47%). Meanduration of pain before presentation was 14.81 + 6.20 hours. Mean severity of pain on visualanalogue scale was 9.40 + 0.8. Overall 79 patients were diagnosed as having ureteric calculi.Ultrasonography detected the ureteric stone in 75 patients and was all found to have stoneon CT scan and represented true positives. Among 25 patients in whom ultrasound did notdemonstrate any stone, 4 were found to have ureteric stone on CT scan thus representing falsenegative whereas 21 (84%) were confirmed on CT scan not to have any stone, thus representingTrue negatives. The sensitivity of USG for detection of ureteric stone was found to be 94.9%,the specificity was 100%, and positive predictive value was 100% while negative predictivevalue was 84% .There was no significant effect of age or gender on the accuracy of ultrasound.Conclusion: Ultrasonography is a readily available, non-invasive and reliable investigation inpatients presenting with acute flank pain to diagnose ureteric stones with a specificity of 100%and a sensitivity approaching 95%. Thus it is recommended that it should be used routinely forthe evaluation of patients presenting with acute flank pain.
Is combined ultrasound with radiography sufficient for the diagnosis of obstructive ureteric stone in patients with acute flank pain?