Barindranath Mallick1, Jayanta Pal2
BACKGROUND The renal resistive index (RI), which is considered a reflection of renal parenchymal resistance, has been widely used to support diagnostic and therapeutic procedures.
OBJECTIVES
To determine renal parenchymal disease that produces increased renal vascular resistance from those which do not and for correlation of resistive index with percutaneous kidney biopsy findings.
MATERIALS AND METHODS
A prospective study was carried out for a period of 18 months in the Radiology Dept. of IPGMER, Kolkata. All the Patients with renal parenchymal disease during the study period were included, Doppler ultrasound was used to calculate RI (resistive index), and Ultrasound-guided percutaneous kidney biopsy was done to obtain the findings. Data was entered in Excel sheet and sensitivity, specificity, positive predictive value, negative predictive value, accuracy and Z test was applied.
RESULTS
Among the 50 study subjects, 50% were males and the rest were females. Sensitivity, specificity and accuracy was high for tubulointerstitial disease as compared to glomerular disease. Z-test also showed significant difference between the two groups.
CONCLUSION
In conclusion, duplex Doppler sonography would seem to detect a state of increased vascular resistance (elevated RI) in some forms of renal parenchymal disease but not in others.
