Indications: Detection of subpelvic stenosis.
Measurement: Transverse diameter of the anechoic separation of the renal sinus
Test substance: Furosemide
x Measure the transverse diameter of the central echo complex at the widest point.
x Administer 20mg of furosemide by i.v. bolus.
x Repeat the measurement at 5min and 15min.
x In a normal examination, the separation of the central echo complex measured at 15 min is less than the separation measured at 5 min.
x If the separation increases or shows no change, an obstructive subpelvic stenosis should be suspected.
Measurement of the separation of the renal sinus echo complex
Sonographic measurement. ++ = separation of central echo complex,K = kidney