Pediatric stone disease

Urinary stone disease is less common in children than adults. Although many aspects of pediatric stone disease are similar to that of adults, there are unique concerns regarding the presentation, diagnosis, and management of stone disease in children. We present a review of the increasing prevalence of pediatric stone disease, the diagnostic concerns specific to children, recent results from pediatric series regarding the expectant management and surgical treatment of stones, metabolic evaluation, and current research on the genetics of nephrolithiasis.

Pediatric ureteroscopic management of intrarenal calculi

PURPOSE

Data addressing ureteroscopic management of intrarenal calculi in prepubertal children are limited. We reviewed our experience from January 2002 through December 2007.

MATERIALS AND METHODS

We retrospectively reviewed ureteroscopic procedures for intrarenal calculi in children younger than 14 years. Stone-free status was determined with postoperative imaging. Multiple logistic regression analysis was used to assess the influence of preoperative factors on initial stone-free status and the need for additional procedures.

RESULTS

Intrarenal calculi were managed ureteroscopically in 52 kidneys in 50 children with a mean age of 7.9 years (range 1.2 to 13.6). Mean stone size was 8 mm (range 1 to 16). Stone-free rate after a single ureteroscopic procedure was 50% (25 of 50 patients) on initial postoperative imaging and 58% (29 of 50) with extended followup. Initial stone-free status was dependent on preoperative stone size (p = 0.005) but not stone location. Additional stone procedures were required in 18 upper tracts. Younger patient age (p = 0.04) and larger preoperative stone size (p = 0.002) were associated with the need for additional procedures. Additional procedures were required in more than half of the stones 6 mm or larger but in no stone smaller than 6 mm.

CONCLUSIONS

Ureteroscopy is a safe method for the treatment of intrarenal calculi in the prepubertal population. Our ureteroscopic stone-free rate for intrarenal stones is lower than that reported for ureteral stones. Parents should be informed that additional procedures will likely be required, especially in younger patients and those with stones larger than 6 mm.

Training residents in hypospadias repair: variations of involvement

PURPOSE

Hypospadias repair is a complex and seminal procedure that has defined the subspecialty of pediatric urology. We sought to determine the degree of training and opinions regarding the need for fellowship training to achieve necessary competence in hypospadias repair.

MATERIALS AND METHODS

An electronic survey was sent to 518 urology residents and recent graduates, and to 168 practicing pediatric urologists. Nonresponders were resent the survey 2 additional times. The survey consisted of basic questions on level of training or years in practice. Residents and practicing pediatric urologists were asked about the level of resident participation for each step of the hypospadias procedure, and opinions on the necessity of fellowship training. Data were analyzed for statistical differences with Wilcoxon rank sum and multiple and logistic regression tests.

RESULTS

Surveys were completed by 89 pediatric urologists and 208 urology residents or recent graduates (response rate 53% and 40%, respectively). Approximately 70% of residents and attending physicians report that less than 50% of the overall hypospadias procedure is performed by the resident. There appears to be agreement between residents and attending physicians regarding the perceived amount of resident participation for all steps of the procedure except glanular mobilization. Additionally, 71% of residents and 86% of attending physicians believe that a pediatric fellowship is necessary to perform hypospadias surgery.

CONCLUSIONS

The majority of residents and attending physicians report limited resident participation in hypospadias surgery. Residents and attending physicians have significant agreement on perceived participation. Our data do not corroborate the program data regarding the role of urology residents in hypospadias repair. The majority of residents and pediatric urologists believe specialized training is required to perform hypospadias surgery.

Transverse Myelitis in Children: Long-Term Urological Outcomes

PURPOSE

Urological complications are well documented in patients with traumatic spinal cord injury. We examined the long-term urological outcomes in a large population of children affected by transverse myelitis.

MATERIALS AND METHODS

We retrospectively reviewed the medical history, imaging studies and urodynamic findings in 22 children with transverse myelitis. Age at disease onset ranged from 3 months to 18 years (average 8.8 years).

RESULTS

At a mean followup of 7.1 years 19 patients (86%) had persistent bladder dysfunction and 17 (77%) had persistent bowel dysfunction. Initial evaluation at least 1 month after disease onset revealed detrusor overactivity in 59% of patients, detrusor external sphincter dyssynergia in 41%, low compliance in 47% and detrusor leak point pressure greater than 40 cm water in 12%. Functional motor recovery and absence of lower extremity spasticity did not reflect normal urodynamic findings. Of the 19 patients with imaging available for review 5 (26%) had upper tract changes. One patient had development of chronic renal insufficiency. Low compliance (p = 0.02) and upper tract changes (p = 0.1) were more frequent in patients who started clean intermittent catheterization more than 2 years after disease onset.

CONCLUSIONS

Persistent bowel and bladder dysfunction is common in transverse myelitis. Urodynamic abnormalities may be present despite normal neurological examination and absence of urinary symptoms. All pediatric patients with transverse myelitis require baseline renal ultrasound and urodynamic evaluation to guide treatment. Early institution of clean intermittent catheterization appears to preserve bladder compliance and decrease upper tract disease, and should be instituted at disease onset.

Is bladder biopsy necessary at three or six months post BCG therapy?

The standard of practice set by the SWOG investigation of BCG therapy for superficial bladder cancer has been to evaluate response at 3 months with cystoscopy and bladder biopsy. This study is to determine if all patients require a biopsy post therapy at 3 or 6 months. We reviewed the charts of 43 patients who had received a 6-weekly course of BCG (Connaught strain) for high grade or recurrent Ta, T1, or Tis transitional cell carcinoma of the bladder. The patients with Ta recurrent, T1 or Tis disease received maintenance therapy. All patients were followed through 6 months. At 3 months, 32/43 patients had negative cystoscopies. All 32 patients had corresponding negative biopsies. Eight patients had visible papillary tumors, while three patients had erythematous lesions, which were biopsy negative. At 6 months, eight different patients had visible lesions on cystoscopy that were biopsy proven superficial bladder cancer. The positive predictive value at 3 and 6 months post BCG therapy was 72.6% and 100%, respectively. The false positive rate was 7% at the 3-month checkpoint. Bladder biopsy is not necessary at the 3 or 6 month period following BCG therapy in the face of negative cystoscopic findings.