Furosemide urinary system

Furosemide (Lasix) will enhance the detection of a dilated collecting system by rapid washout of the radiotracer from the pelvis and ureter, while in the case of urinary tract obstruction, no change of pelvic retention and in the shape of the time-activity curve is seen (O Reilly 1992). 

However, despite these findings, some patients ureters may still not be fully opacified or distended. The intravenous administration of furosemide (10 mg over 1 min, 2-3 min before the contrast medium injection) either alone or in addition to intravenous saline (250 ml of saline) improved the depiction of the normal urinary collecting system at multi-detector row CTU (Silverman et al. 2006). 

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