Sonographic Measurements of Diuresis Urography

Indications: Detection of subpelvic stenosis.

Measurement: Transverse diameter of the anechoic separation of the renal sinus
echo complex

Test substance: Furosemide

Procedure:
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.

Findings:
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.