Muhammad Wasim Awan, Saira Zaman, Yasrab.
Validity of Doppler Sonography in Diagnosis of Unilateral Acute Renal Obstruction Due to Calculus.
Ann Pak Inst Med Sci Jan ;12(4):199-202.

Objective: To determine the validity of Duplex Doppler Sonography in the diagnosis of unilateral acute renal calculus obstruction against IVU as a gold standard. Patient and Methods: The cross-sectional study was conducted over a period of 6 months in the Department of Radiology, KRL Hospital, Islamabad. Patients with acute renal colic presenting between 6 to 48 hours of onset of the symptoms of either gender and adult age group underwent ultrasound examination and Doppler ultrasound, RI of both kidneys was measured and delta RI calculated for each patient. The IVU examination was performed after the Doppler sonography to confirm the urinary obstruction. The findings from both the investigations were recorded in the proforma. Results: In our study, out of 254 cases, 54.72%(n=139) were between 18-40 years and 45.28%(n=115) were between 41-70 years of age, mean+SD was calculated as 41.76+12.80 years, 57.09%(n=145) were male and 42.91%(n=109) were females, frequency of true positive obstruction on IVU was recorded in 68.11%(n=173) while 31.89%(n=81) were recorded as negative, validity of Duplex Doppler Sonography in the diagnosis of unilateral acute renal calculus obstruction against IVU as a gold standard was calculated which shows that 63.39%(n=161) were true positive, 2.36%(n=6) were false positive, 29.53%(n=75) were true negative and 4.72%(n=12) were false negative, Sensitivity, specificity, positive predictive value, negative predictive value and accuracy rate was computed as 93.06%, 92.59%, 96.40%, 86.21% and 92.91% respectively. Conclusion: We concluded that the diagnostic accuracy of Duplex Doppler USG for determining the calculus urinary obstruction in our local population is higher and it may be recommended where IVU facilities are not available.

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