Minimizing the Utilization of Voiding Cystourethrography for Patients With Antenatal Hydronephrosis

Minimizing the Utilization of Voiding Cystourethrography for Patients With Antenatal Hydronephrosis

It has previously been found that there is no correlation between degree of hydronephrosis and presence of reflux; however this is oftentimes the criteria physicians use to obtain a VCUG.

Investigators conducted a previous retrospective study to evaluate other possible findings on ultrasound that may better predict reflux. Investigators found that if a postnatal ultrasound showed any of the three findings of hydroureter, duplication or dysmorphic kidney, then the odds ratio of detecting reflux was 8.07 (95%CI 3.86, 16.87). The purpose of this study is to perform a randomized prospective study to validate this retrospective study. Investigators hypothesis is that patients with hydronephrosis alone will be more likely to have negative VCUG studies; hence obtaining a VCUG for this indication may not be warranted.

Inclusion Criteria:

• Patients with a history of antenatal hydronephrosis who have a post-natal ultrasound demonstrating hydronephrosis alone and no other abnormalities

Exclusion Criteria:

• Patients with a post-natal ultrasound demonstrating bilateral hydronephrosis
• Patients with a history of posterior urethral valve or when a valve is suspected
• Patients who have hydronephrosis on ultrasound as well as other findings including duplication, hydroureter, dysmorphic kidneys, or bladder abnormalities