[Validation of the renogram with immediate diuretic stimulus]

Area of Science:

• Nuclear Medicine
• Pediatric Urology
• Diagnostic Imaging

Background:

• Diuretic renography is crucial for evaluating pediatric urinary tract obstruction.
• Timing of diuretic administration impacts renogram interpretation and patient selection for surgery.
• Optimizing the renogram protocol can improve diagnostic accuracy and patient comfort.

Purpose of the Study:

• To assess the diagnostic reliability of simultaneous diuretic stimulus (F0) versus delayed stimulus (F+10) in renography.
• To compare the efficacy of two diuretic renogram protocols for selecting pediatric surgical candidates.
• To determine if simultaneous diuretic administration affects diagnostic parameters.

Main Methods:

• Retrospective analysis of 59 patients in the F0 group and 59 in the F+10 group.
• Diuretic renography performed using (99m)Tc-Mercaptoacetylglycine with furosemide stimulus.
• Comparison of visual analysis, curve parameters, and elimination percentages between F0 and F+10 protocols.

Main Results:

• The F+10 renogram demonstrated sensitivity of 96.7% and specificity of 96.1%.
• The F0 renogram showed high diagnostic accuracy with sensitivity of 95.2% and specificity of 98.9%.
• Both methods yielded comparable positive and negative predictive values.

Conclusions:

• Simultaneous diuretic stimulus (F0) is a useful and comfortable method for pediatric renography.
• This protocol does not significantly compromise diagnostic efficiency for surgical patient selection.
• The F0 method offers a practical alternative for diuretic renogram in pediatric urological evaluations.