(99m)Tc-MAG3 diuretic renography in diagnosis of obstructive nephropathy in adults: a comparison between F-15 and a new procedure F+10(sp) in seated position.

OBJECTIVE The objective of this study was to compare 2 diuretic renography procedures: F-15 versus F+10(sp) for diagnosis of obstructive uropathy in adults. METHODS Thirty-six patients with unilateral or bilateral hydronephrosis had 2 consecutive Tc-MAG3 diuretic renograms within 7 days, using the widely used procedure F-15 in supine position, and a new seated-position procedure whereby the patient drinks 400 to 500 mL of water at 5 minutes and receives an injection of 20 mg of furosemide at 10 minutes [F+10 (sp)]. RESULTS F-15 showed nonobstructive results in 63.9% of kidneys, obstruction in 26.4%, and equivocal findings in 6.9% and was not applicable in 2.8%. F+10(sp) showed nonobstructive results in 70.9%, obstruction in 27.8%, and equivocal result in 1.4% of kidneys. Nephroptosis was observed by F+10(sp) in 22.2% of kidneys. Adverse effects reported for the F-15 were hypotension in 2 patients, renal colic in 3 patients, and interruption due to voiding in 5 patients. No adverse effects were reported for F+10(sp). CONCLUSIONS This study shows that the F+10(sp) procedure reduces the equivocal findings of F-15 procedure in 36 patients. It can improve the accuracy and compliance, avoiding adverse effects and reducing bladder filling-related problems.