5. Accuracy of Resistive Index of Color Doppler Ultrasonography in Detecting Acute Unilateral Ureteric Obstruction due to Calculus
Zainab Safdar1, Muhammad Naeem Safdar2, Rabeea Tahira2 and Muhammad Shahid2
ABSTRACT
Objective: To assess the diagnostic accuracy of RI of colour Doppler ultrasonography for the diagnosis of acute unilateral ureteric obstruction due to calculus taking non-enhanced CT KUB as gold standard.
Study Design: Cross-sectional study.
Place and Duration of Study: This study was conducted at the Department of Radiology, Sir Ganga Ram Hospital, Lahore from October 2015 to March 2016.
Materials and Methods: A total of 150 patients were enrolled. Colour Doppler ultrasonography (CDUS) was done and measurements of RI of interlobar arteries were made. Three to five waveforms were recorded and average was noted. If RI ≥0.70, the patients were labelled as positive otherwise negative. Then patients underwent computed tomography for confirmation.
Results: Mean age of patients was 41.10±11.05 years. Mean RI on CDUS was 0.69±0.11. Sensitivity and specificity of RI were 93.15% (69/73) and 94.81% (73/74), PPV and NPV for RI were 94.44% and 93.59% respectively and diagnostic accuracy was 94% for detection of acute unilateral ureteric obstruction.
Conclusion: Diagnostic accuracy parameters of RI showed that it can be reliably suitable modality for detection of patients with suspected ureteric obstruction in its earliest stage.
Key words: Resistive index, Color Doppler ultrasonography, Acute unilateral ureteric obstruction, Enhanced computed tomography
Citation of article: Safdar Z, Safdar MN, Tahira R, Shahid M. Accuracy of Resistive Index of Color Doppler Ultrasonography in Detecting Acute Unilateral Ureteric Obstruction due to Calculus. Med Forum 2019;30(12):20-23.