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S12-13
(P)
UROFLOW RESULTS BEFORE AND AFTER HYPOSPADIAS REPAIR IN TOILET
TRAINED BOYS
Nicol BUSH and Warren SNODGRASS
PARC Urology, Urology, Dallas, USA
PURPOSE
Flow rates after hypospadias repair are generally lower than reported nomograms for normal boys. However, few
studies evaluate flow parameters in toilet trained boys with uncorrected hypospadias. We now report voided volumes,
and maximum (Qmax) and average (Qave) flow rates in boys before and after hypospadias repair.
MATERIAL AND METHODS
All toilet-trained patients with hypospadias undergo uroflowometry at our center, with parameters recorded
prospectively into a database. All those with uroflowometry obtained before and after hypospadias repair were included.
Patients with voided volume
RESULTS
There were 17 patients who presented at mean age 8 years (3-13; 3 pubertal) with non-operated distal (14) or proximal
(3) hypospadias. No patient had preoperative meatal stenosis based on intraoperative calibration ≥8 Fr before
repair. All had TIP urethroplasty, with postoperative uroflows obtained at 6 months (range 1.5-13). No patient had
obstructive urinary symptoms or postoperative urethroplasty complications. Uroflow results are shown in the Table.
There were no significant differences in preoperative versus postoperative uroflow parameters.
Pre-op Mean (SD) Post-op Mean (SD) p-value
Qmax (cc/sec)
14 (7)
13 (6)
0.55
Qave (cc/sec)
9 (5)
8 (4)
0.54
Voided Volume (cc) 111 (114)
129 (88)
0.56
Plateau-shaped curve 4 (24%)
6 (35%)
0.71
CONCLUSIONS
Data in these patients provide new insight into the decreased Qmax and Qave often reported after hypospadias repair,
suggesting such decreased flow parameters are present before surgery and that the native urethra in patients with
hypospadias may not be normal.