Kwan Hyun Park

Prevalence and Associated Factors of Overactive Bladder in Korean Children 5-13 Years Old: A Nationwide Multicenter Study

OBJECTIVES To estimate the prevalence of overactive bladder (OAB) in Korean children, 5-13 years of age, and to assess the associated factors for OAB. METHODS A randomly selected cross-section study was conducted in 26 kindergartens and 27 elementary schools nationwide in Korea. A total of 19 240 children were included; a parent was asked to complete the questionnaires, which included items about OAB and voiding and defecating habits. OAB was defined as urgency with or without urge incontinence, usually with increased daytime frequency and nocturia (International Childrens Continence Society, 2006). Its prevalence and associated factors were also investigated. RESULTS The response rate for the questionnaires was 85.84%. The overall prevalence of OAB was 16.59%. The prevalence of OAB decreased with age from 22.99% to 12.16% (P = .0001). The overall incidence of wet and dry OAB was 26.97% and 73.03%, respectively. Compared with normal children, those with OAB had a greater prevalence of nocturnal enuresis, constipation, fecal incontinence, urinary tract infection, delayed bladder control, and poor toilet facilities (P < .05). The incidence of increased daytime frequency and urge incontinence was 3.69% and 2.31% (P = .009) and 26.97% and 14.78% (P = .0001) in OAB and non-OAB children, respectively. The corresponding prevalence decreased with age from 5.04% to 3.06% and from 45.74% to 18.50% in OAB children (P = .0001). CONCLUSIONS The overall prevalence of OAB in Korean children, 5-13 years of age, was 16.59% and decreased with age. Nocturnal enuresis, constipation, fecal incontinence, history of urinary tract infection, delayed bladder control, and poor toilet facilities might be factors associated with the development of OAB.

An Epidemiologic Study of Voiding and Bowel Habits in Korean Children: A Nationwide Multicenter Study

OBJECTIVES To evaluate the prevalence of abnormal voiding and bowel habits in healthy children, and to identify possible relationships between personal and familial factors and voiding and/or bowel habits. METHODS A randomly selected cross-sectional study was conducted in 19,240 children (5-13 years old) nationwide in the Republic of Korea. Parents were asked to complete questionnaires, which included items about nocturnal enuresis, daytime dysfunctional voiding symptoms (DVSs), and abnormal bowel habits (ABHs). Rates and associated factors were investigated. RESULTS The overall rates of DVS, ABH, and of both were 46.4%, 31.3%, and 18.4%, respectively, and nocturnal enuresis was reported in 919 (5.6%). Daytime dysfunctional voiding symptoms were as follows: increased voiding frequency in 419 (2.5%), decreased voiding frequency in 720 (4.4%), urgency in 2740 (16.6%), daytime incontinence in 1854 (11.2%), urge incontinence in 2775 (16.8%), and holding maneuvers or postponed voiding in 3888 (23.5%). ABHs were as follows: constipation by frequency in 1103 (6.7%), constipation by the Bristol scale in 1941 (11.8%), fecal incontinence in 1293 (7.8%), and difficult or painful defecation in 2609 (15.8%). Delayed stool control, history of urinary tract infection, and a double-income family were positively associated with DVS or ABH or both. Furthermore, fathers with a low level of education and a low income were found to be associated with higher risk of ABH or DVS or both. CONCLUSIONS Delayed stool control, a history of urinary tract infection, a low paternal level of education, a double-income family, and a lower family income had a negative effect on voiding or bowel habits in children.

Clinical Inconsistency of Lower Urinary Tract Symptoms Between Questionnaire and Bladder Diary in Children With Nocturnal Enuresis

PURPOSE Classification of pediatric enuresis into monosymptomatic nocturnal enuresis and nonmonosymptomatic nocturnal enuresis is crucial for management because these cases differ in many clinical respects. However, correct classification is frequently confused based on questionnaire and/or bladder diary. We tested the consistency of information obtained on lower urinary tract symptoms between our questionnaire and bladder diary. MATERIALS AND METHODS A total of 108 physically and neurologically normal patients (mean age 7.2 years) with enuresis were included in the study. All patients filled out the questionnaire and 3-day bladder diary completely. Our questionnaire included items on urinary frequency, daytime incontinence and voiding postponement. A total of 93 patients underwent uroflowmetry and residual urine measurements. We analyzed information on lower urinary tract symptoms from the questionnaire and the bladder diary, as well as the uroflowmetry results. RESULTS The percentage of children with nonmonosymptomatic nocturnal enuresis was 89.8% and 68.5% based on the questionnaire and bladder diary, respectively. In comparisons between the questionnaire and bladder diary we did not observe any significant consistency regarding urinary frequency (p = 0.912), daytime incontinence (p = 0.356) or voiding postponement (p = 0.505). Maximum voided volume, average voided volume and percent maximum voided volume/expected bladder capacity of children with monosymptomatic nocturnal enuresis were significantly higher than in those with nonmonosymptomatic nocturnal enuresis based on the bladder diary (p = 0.006, 0.001 and 0.041, respectively). By contrast, no significant difference was found between children with monosymptomatic and nonmonosymptomatic nocturnal enuresis based on the questionnaire (p = 0.559, 0.597 and 0.947, respectively). CONCLUSIONS Significant discrepancies in lower urinary tract symptoms were observed between the questionnaire and bladder diary. Therefore, a detailed history and discussion with the patient and family should be performed to correlate with the questionnaire and bladder diary for the proper treatment of children with enuresis. An updated questionnaire containing a detailed scoring system may be needed.

Efficacy of Desmopressin and Enuresis Alarm as First and Second Line Treatment for Primary Monosymptomatic Nocturnal Enuresis: Prospective Randomized Crossover Study

PURPOSE We compared the efficacy of desmopressin and enuresis alarm as first and second line treatment options for monosymptomatic nocturnal enuresis. MATERIALS AND METHODS A total of 104 children with monosymptomatic nocturnal enuresis were randomly assigned to either desmopressin (54) or enuresis alarm (50) as first line treatment. Following 12 weeks of first line treatment children with a full response were evaluated for relapse 12 weeks after withdrawal of treatment. Children with partial or no response were switched to the alternative treatment and then evaluated after 12 weeks of crossover treatment. Relapse was defined as more than 1 episode of bedwetting monthly. RESULTS Following first line treatment 77.8% of the desmopressin group and 82% of the enuresis alarm group achieved a successful result, including full response in 37% and 50% of the groups, respectively (p=0.433). Of the children with a full response 50% in the desmopressin group and 12% in the enuresis alarm group experienced a relapse when treatment stopped (p=0.005). Following second line crossover treatment 71.4% of the enuresis alarm-desmopressin group and 67.8% of the desmopressin-enuresis alarm group achieved a successful result, including full response in 47.6% and 45.2% of the groups, respectively (p=0.961). CONCLUSIONS There was no difference between desmopressin and enuresis alarm during treatment for achieving dryness, but the chance of relapse after treatment stopped was higher following desmopressin. Switching to the alternative treatment following partial or no response provided an additional benefit.

The Efficacy of Enuresis Alarm Treatment in Pharmacotherapy-Resistant Nocturnal Enuresis

OBJECTIVES To assess the efficacy of enuresis alarm (EA) treatment in pharmacotherapy-resistant nocturnal enuresis (PRNE). MATERIAL AND METHODS A retrospective study was performed in children who received EA treatment as a form of combination treatment for PRNE from June 1999 to December 2007. The children included 54 monosymptomatic nocturnal enuresis (MNE) children who had partial response or nonresponse to desmopressin (group 1), 25 nonmonosymptomatic nocturnal enuresis (NMNE) children who had partial response or nonresponse to extended release oxybutynin plus desmopressin (group 2), and 21 MNE or NMNE children who relapsed after responding fully to first-line pharmacotherapy (group 3). EA treatment outcomes were determined as outlined by the International Childrens Continence Society Standardisation Committee. RESULTS Overall, 50% and 53.7%, 40%, and 52.4% of children in groups 1, 2, and 3, respectively, responded fully to EA treatment (no significant differences). In groups 1 and 2, 54.4% (31/57) of the partial responders and 36.4% (8/22) of the nonresponders showed full response (FR) after EA treatment was initiated. Of the children with small bladder capacities, 56.7% showed FR. Of the full responders in each group, 60.7%, 88.9%, and 54.5% of groups 1, 2, and 3, respectively, did not have relapse 6 months after cessation of treatment. CONCLUSIONS Overall, half of the total population achieved FR, and continued success was observed in more than half of full responders irrespective of the groups. Thus, adding EA treatment to pharmacotherapy is an effective second-line therapeutic strategy for children with PRNE.

Efficacy and Safety of Propiverine in Children with Overactive Bladder

Purpose Antimuscarinic therapy remains one of the most common forms of therapy for overactive bladder (OAB) in children. However, few clinical studies on the outcomes of antimuscarinics in children with OAB have been published. Therefore, we evaluated the efficacy and safety of propiverine, which is frequently prescribed for the treatment of pediatric OAB. Materials and Methods We retrospectively reviewed children with OAB treated with propiverine within the past 5 years. The response rates were compared between the non-urge incontinence (non-UI) and urge incontinence (UI groups). The cumulative response rate by treatment duration was also compared between the two groups. Results Among a total of 68 children, 50 children (73.5%) experienced UI. The overall response rate was 86.8%. Functional bladder capacity after treatment was 150 ml, which represented an increase compared with the value (140 ml) before treatment. The voiding frequency per day decreased from 14.0 to 8.5 times. The overall response rate (88.0%) in the non-UI group was not significantly different from that seen in the UI group (83.3%; p>0.05). In non-UI children, the cumulative response rates were 36.0%, 54.0%, 68.0%, 74.0%, 76.0%, and 78.0% at 4, 8, 12, 16, 20, and 24 weeks, respectively. The cumulative response rates in the UI children were 11.1%, 33.3%, 44.4%, 50.0%, 50.0%, and 55.6%, respectively during the same respective time periods. Adverse effects were identified in only two (2.9%) patients, and neither case was severe. Conclusions Propiverine is effective and well tolerated as a treatment for children suffering from OAB with or without UI.

Factors Affecting the Outcome of Extracorporeal Shock Wave Lithotripsy for Unilateral Urinary Stones in Children: A 17-Year Single-Institute Experience

Purpose Extracorporeal shock wave lithotripsy (ESWL) is a first-line treatment for pediatric urinary stone disease. We aimed to determine the factors affecting the outcome of ESWL for unilateral urinary stones in children. Materials and Methods A total of 81 pediatric patients aged 0 to 16 years with urinary stones treated by ESWL from January 1995 through May 2012 were retrospectively reviewed. All patients were required to have unilateral urinary stone disease. Children who underwent other surgical procedures before ESWL were excluded. Outcomes evaluated after ESWL were the stone-free rate at 3 months after ESWL, success within a single session, and success within three sessions. Factors affecting the success within three sessions were also analyzed. Results The final analysis was for 42 boys and 22 girls (mean age, 9.2±5.2 years). Of these 64 patients, 58 (90.6%) were treated by ESWL without other surgical procedures and 54 (84.4%) were successfully treated within three ESWL sessions. In the multivariate analysis, multiplicity (odds ratio [OR], 0.080; 95% confidence interval [CI], 0.012 to 0.534; p=0.009) and large stone size (>10 mm; OR, 0.112; 95% CI, 0.018 to 0.707; p=0.020) were significant factors that decreased the success rate within three ESWL sessions. Conclusions Most of the pediatric urinary stone patients in our study (90.6%) were successfully treated by ESWL alone without additional procedures. If a child has a large urinary stone (>10 mm) or multiplicity, clinicians should consider that several ESWL sessions might be needed for successful stone fragmentation.

Characteristics and clinical outcomes of renal cell carcinoma in children: a single center experience.

The present study aimed to assess the clinicopathological characteristics and the prognosis of renal cell carcinoma (RCC) in children. We retrospectively reviewed the medical records of 11 Korean children (7 boys and 4 girls) undergoing radical nephrectomy for RCC between September 1997 and January 2008 at our institution. Mean age at diagnosis was 12.7 years. The presenting clinical signs and symptoms included gross hematuria (55%), abdominal mass (45%) and abdominal pain (45%). Two (18%) of the cases were discovered incidentally. Five (45%) were conventional clear cell, four (36%) were papillary, one was a chromophobe and one was a translocation carcinoma. Seven children were T1N0M0, three were T2N0M0 and one child was T1N1M0. While one patient with T2 disease died of disease 89 months postoperatively, the remaining 10 patients, including a patient with regional nodal disease who received adjuvant immunochemotherapy, survived without evidence of recurrence at a mean follow‐up of 6.8 years. Our data suggest that the clinical presentation, pathological characteristics and clinical behavior of pediatric RCC are different from those of adult RCC.

Urothelial Tumors of the Urinary Bladder in Two Adolescent Patients: Emphasis on Follow-up Methods.

Here we describe two cases of papillary urothelial neoplasm of low malignant potential in adolescent boys. One case was a 16-year-old boy with a polypoid mass beside the right ureteral orifice and the other case was a 13-year-old boy with a papillary mass beside the left ureteral orifice. The initial presentation was hematuria in both cases and the bladder mass was detected by ultrasonography. Complete resection of the bladder tumor was performed by using an 11-Fr pediatric resectoscope. Follow-up has been performed with urine analysis, urine cytology, and bladder ultrasonography or cystoscopy every 3 months with no evidence of recurrence.

Risk factors for contralateral patent processus vaginalis determined by transinguinal laparoscopic examination

Concurrent contralateral inguinal exploration in children with unilateral hernia or hydrocele is a subject of debate. The aim of the present study was to investigate the incidence of contralateral patent processus vaginalis (CPPV) using transinguinal laparoscopy (inguinoscopy). In addition, the risk factors of CPPV were evaluated in order to facilitate the selection of appropriate candidates for contralateral examination. A total of 119 patients who presented with unilateral hydrocele, inguinal hernia or cryptorchidism between 2001 and 2008 underwent inguinoscopy during the ipsilateral surgery. All data were collected prospectively. The incidence of CPPV was investigated and the risk factors affecting the presence of CPPV were analyzed. Among these patients, 29 individuals (24.4%) had CPPV confirmed by inguinoscopy. No surgical complications were observed during the inguinoscopy. Cases with suspicious ultrasound findings were at a higher risk of CPPV than cases with normal findings (odds ratio, 13.800; P=0.004). A history of contralateral disease was also found to be a significant risk factor (odds ratio, 4.008; P=0.019). The present study identified that the significant risk factors for CPPV were suspicious findings on ultrasound examination and a history of contralateral disease. Therefore, it is concluded that performing inguinoscopy in children with these risk factors is beneficial.