Chung Ky Hyun;Hwa Jeong Seok;Paik Sang Hoon;Pak Jin Soo;Lim Jin Kyu;Choi Jae Hoon
Childhood Kidney Diseases
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v.4
no.1
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pp.57-62
/
2000
Purpose: Unilateral ureteropelvic junction obstruction with high grade of hydronephrosis an obstructed diuretic renogram but good differential renal function were studied to evaluate the natural history of untreated obstruction. Materials and Methods: During the last three years, we encountered 18 kidneys with hydronephrosis detected on prenatal ultrasound. In all these patients other urologic abnormalities were excluded by voiding cystourethrography and other radiological studies. Diuretic renography was initially performed at an age ranging from 2 weeks to 4 weeks. Five had high degree of hydronephrosis and obstructed diuretic renogram despite good relative renal function. Periodic urine examination, ultrasonography and diuretic renogram were done at regular intervals. Results: We have followed 5 neonates with unilateral hydronephrosis and suspected ureteropelvic junction obstruction with noroperative treatment for 15 months. During followup, percentage and relative renal function were maintained in all patients and hydronephrosis improved. Obstructive patterns on diuretic renogram were variable. Conclusions: These findings help to define the natural history of untreated good functioning hydronephrotic kidneys. Many newborn kidneys with severe hydronephrosis are not obstructed despite even high grade of hydronephrosis and obstructed diuretic renogram.
Purpose : Vesicoureteral reflux(VUR) is the major risk factor of urinary tract infection(UTI) in children and may result in serious complications such as renal scarring and chronic renal failure. The purpose of this study was to evaluate the relationship between VUR and renal scar formation, the usefulness and correlation of various imaging studies in reflux nephropathy, and the spontaneous resolution of VUR. Methods : We retrospectively reviewed 106 patients with VUR with no accompanying urogenital anomalies in the Department of Pediatrics, Bundang CHA Hospital during the period from Jan. 1996 to Mar. 2005. Ultrasonography and $^{99m}Tc$-dimercaptosuccinic acid(DMSA) scan were performed in the acute period of UTI. Voiding cystourethrography(VCUG) was performed 1 to 3 weeks after treatment with UTI. Follow-up DMSA scan was performed 4 to 6 months after treatment and a follow-up VCUG was performed every 12 months. Results : The mean age at detection of VUR was $13.8{\pm}22.2$ months and the male to female ratio was 2:1. The incidence of renal scarring showed a tendency of direct correlation between severity of VUR(P<0.001) and abnormal findings of renal ultrasonography(P<0.01). 63.2%(24 of 38 renal units) of renal parenchymal defects present in the first DMSA scan disappeared on follow-up DMSA scans. Follow-up DMSA scans detected renal scars in 7(14%) of 50 renal units with ultrasonographically normal kidneys. Meanwhile, ultrasonography did not show parenchymal defects in 7(36.8%) of 19 renal units where renal scarring was demonstrated on a follow-up DMSA scan. The spontaneous resolution rate of VUR was higher(75%) in cases with low grade(I to III) VUR(P<0.01). Conclusions : The presence and severity of VUR and abnormal findings of renal ultrasonography significantly correlated with renal scar formation. DMSA scan was useful in the diagnosis of renal defects. Meanwhile renal ultrasonography was an inadequate method for evaluating renal parenchymal damage. Therefore, follow-up DMSA scans should be performed to detect renal scars even in children with low-grade VUR and normal renal ultrasonography.
Byun, Jung Lim;Lee, Sang Taek;Chung, Sochung;Kim, Kyo Sun
Clinical and Experimental Pediatrics
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v.53
no.2
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pp.222-227
/
2010
Purpose : To evaluate the significance of clinical signs and laboratory findings as predictors of renal parenchymal lesions and vesicoureteral reflux (VUR) in childhood urinary tract infection (UTI). Methods : From July 2005 to July 2008, 180 patients admitted with a first febrile UTI at the Pediatric Department of Konkuk University Hospital were included in this study. The following were the clinical variables: leukocytosis, elevated C-reactive protein (CRP), positive urine nitrite, positive urine culture, and fever duration both before and after treatment. We evaluated the relationships between clinical variables and dimercaptosuccinic acid (DMSA) scan and voiding cystourethrography (VCUG) results. Results : VCUG was performed in 148 patients; of them, 37 (25.0%) had VUR: 18 (12.2%) had low-grade (I-II) VUR, and 19 (10.5%) had high-grade (III-V) VUR. Of the 95 patients who underwent DMSA scanning, 29 (30.5%) had cortical defects, of which 21 (63.6%) had VUR: 10 (30.3%), low-grade (I-II) VUR; and 11 (33.3%), high-grade VUR. Of the 57 patients who were normal on DMSA scan, 8 (14.0%) had low-grade VUR and 6 (10.5%) had high-grade VUR. The sensitivity, specificity, and positive and negative predictive values of the DMSA scan in predicting high-grade VUR were 64.7%, 69.9%, 33.3%, and 89.5%, respectively. Leukocytosis, elevated CRP, and prolonged fever ($36{\geq}$ hours) after treatment were significantly correlated with the cortical defects on DMSA scans and high-grade VUR. Conclusion : Clinical signs, including prolonged fever after treatment, elevated CRP, and leukocytosis, are positive predictors of acute pyelonephritis and high-grade VUR.
Purpose : Vesicoureteral reflux(VUR) is defined as a retrograde flow of urine from the bladder into the upper urinary tract. It has been shown to predispose patients to hypertension, renal scarring, and end-stage renal failure if not recognized and treated. The observation that VUR occurs in siblings of children with reflux at a significantly higher rate than the general pediatric population has been recognized for many years and VUR was detected in 26% to 51% of siblings of patients with VUR. The purpose of this study is to determine the incidence of VUR in asymptomatic siblings of children with VUR and to see if this form of screening would be practical. Methods : We retrospectively reviewed the records of 28 patients with VUR and their siblings. The total number of asymptomatic siblings investigating VUR were 28 persons. All patients and siblings were evaluated for VUR by a voiding cystourethrography and all patients and siblings with VUR were performed $^{99m}Tc$ 2,3-dimercaptosuccinic acid renal scan. Results : A total of 28 patients(14 boys, 14 girls) with VUR were studied; the mean patient age was 2.7 years(range 1 month to 8.4 years). The total number of asymptomatic siblings investigating VUR were 28 persons(17 boys, 11 girls) and the mean age was 3.3 years(range 2 months to 7.4 years). Renal scar was detected in 20 of 28(71.4%) patients with VUR. VUR was noted in three of 28(10.7%) siblings and renal scar was detected in one of three siblings with VUR. Conclusion : In this study, the predictive value of a positive family history alone in identifying VUR was 10.7%. This incidence suggests more investigation of asymptomatic siblings and continued study of this group of patients at risk is needed for clarifying the family screening of patients with VUR.
Purpose : It is difficult to diagnose acute pyelonephritis(APN) in young children, because of their nonspecific symptoms. The younger the age, the higher the risk of renal scars after APN, which can be prevented by early diagnosis and treatment. We compare the significance of renal imaging studies by age for diagnosis of APN in febrile urinary tract infection(UTI) in children. Methods : Fifty-three hospitalized children(34 patients under age 2 and 19 patients over age 2) with febrile UTI and who had undergone dimercaptosuccinic acid(DMSA) scan, renal ultra sonography(RUS) and voiding cystourethrography(VCUG) during the acute stage were re-viewed. We compared the renal imaging studies between the different age groups. Results : The DMSA scan showed cortical defects in 23.5% of patients under age 2, which was significantly lower than 63.2% of patents over age 2(P<0.05). The renal cortical defects on DMSA scan were associated only with a high peripheral leukocyte count, but not with fever duration, erythrocyte sedimentation rate(ESR), and C-reactive protein(CRP). And there was no correlation between the DMSA scan, VCUG or RUS findings. Conclusions : The DMSA scan is not sensitive for diagnosis of APN in children less than 2 years of age and the findings cannot predict the presence of vesicoureteral reflux(VUR). VCUG may be necessary for proper management in this age group.
Jang Kyung-Ah;Yang Jeong-A;Hah Tae-Sun;Park Hye-Won;Lee Jun-Ho
Childhood Kidney Diseases
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v.7
no.1
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pp.38-43
/
2003
Purpose : Accurate diagnosis of acute pyelonephritis(APN) using clinical and laboratory parameters is often difficult in children. Clinical and experimental studies have demonstrated that renal scarring can be prevented or diminished by early diagnosis and aggressive treatment of acute pyelonephritis. dimercaptosuccinic acid(DMSA) renal scan has been reported to be useful in children for confirmation of the diagnosis of acute pyelonephritis. An analysis was undertaken to correlate the clinical and laboratory manifestations of APN With the results of the DMSA renal scan in different age groups. Methods : We determined the sensitivity of DMSA renal scan in febrile urinary tract infections(UTI) in two groups according to age : group I in less than 2 years; group II in older than 2 years. During the period March 2001 through September 2002, 67 children presented with febrile UTIs. All patients had DMSA renal scan done in the acute period, 55 had voiding cystourethrography(VCUG) and 66 had renal ultrasonogram(RUS) done. Results : There were no significant difference between the two groups in DMSA renal scan (P>0.05). But, in group I sensitivity of DMSA renal scan was 47%; in group II sensitivity of DMSA renal scan was 70%. The grade of reflux correlated with a positive DMSA renal scan. Vesicoureteral reflux did not correlate with age. RUS did not correlate with a positive DMSA renal scan in any age group. Abnormality of RUS did not correlate with age. Conclusion : At present, we believe that DMSA renal scan is the prevailing method in differention of the APN. In addition, it is not invasive and less costly. Even though there is no statistical difference in the sensitivity of DMSA renal scan between young and older children, we can observe that in the younger group, the sensitivity of DMSA renal scan seemed to be lower(47%).
Purpose : The purpose of this study is to determine if there are prognostic factors leading to permanent parenchymal damages to kidney in children after acute pyelonephritis. Methods : This study was conducted in 160 pediatric patients with acute pyelonephritis admitted to Ajou University Hospital from 2000 to 2005, whose renal cortical defects were confirmed by $^{99m}Tc$-dimercaptosuccinic acid scintigraphy (DMSA scan). Along with the follow-up DMSA scan after 6 months, they were classified into two groups; recovered group (106) and scarred group (54). The clinical characteristics of each group were compared. Results : Among the total of 160 patients, 106 (66.3%) showed recovery of the initial defect (the recovered group), while 54 (33.8%) showed permanent defects on the followup DMSA scan (scarred group). Recovery rate was poor for patients of 1 year and older, or patients with the duration of fever and pyuria longer than 7 days. The recovery rate was poor in the patients with history of frequent febrile episodes and abnormal results of imaging studies, such as voiding cystourethrography (VCUG), ultrasonography. Conclusion : The recovery rate of children with renal defects on DMSA scan with acute pyelonephritis was lower when the patient is older than 1 year, when the duration of fever and pyuria exceeded 7 days, and when the patients had the histories of frequent febrile episodes and had urinary tract abnormalities on imaging studies. These findings suggest that there may be under- or mis-diagnosis of acute pyelonephritis by pediatrician.
Purpose: To determine the various prenatal factors related to the prenatal hydronephrosis diagnosed on prenatal ultrasonography. We also attempted to correlate the prenatal and neonatal renal pelvic anteroposterior diameter with the outcome in infancy Methods: Between 1985 and 1997. We retrospectively reviewed 105 renal unit (75 patient) with fetal hydronphrosis persisting postnatally. Investigation consisted of renal ultrasonography, voiding cystourethrography, diurectic renogram, and DMSA scan. Results: The 75 patient assesed had the following underlying cause: UPJ(Ureteropelvic juction) obstruction(52%). multicystic dysplastic kidney(10%). UVJ (Ureterovesicai juction) obstruction (10%) and no underlying cause (25%). Of theses cases 36 cases (40 renal unit) underwent operation, while 28 cases (50 renal unit) resoled spontaneously. 12% of mild hydornephrosis deteriorated. whereas 50% of modrate hydrophrosis and 81% of severe hydronephrosis required surgical correction. Attempting to find the renal unit that were at risk for deterioration. our study showed that urinary tract infection group and calyceal blunting group had a predictive role. Conclusion: It is necessary to follow up after birth dilatation of caylx or urinary tract infection are present. Early operation is considered when prenatal pelvic AP diameter greater is than 22 mm and postnatal diameter greater than 17 mm. This may make it possible to prevent further progression of renal damage and prompt treatment of asymptomatic hydronephrosis before complications occur.
Purpose : It has been well known that urinary tract infection(UTI) in infants and children is frequently associated with vesicoureteral reflux(VUR). However, the publishied papers dealing with congenital anomalies associated with UTI emphasized the importance of VUR only. The aim of our study was to evaluate the type, incidence and spectrum of urologic anomalies associated with UTI. Methods : Medical records of clinical, bacteriologic and radiologic study were assessed retrospectively in 65 infants or children with documented UTI who were admitted to the Department of Pediatrics, Samsung Seoul Hospital from March 1996 to February 1998. Results : Spectrum of anomalies were associated with UTI as follows: VUR(n=23), both ectopic kidney(n=1), ureterovesical junction(UVJ) obstruction(n=1), multicystic dysplastic kidney(n=1), ureteropelvic junction(UPJ) obstruction with hydronephrosis(n=1), hutch diverticulum(n=1), UPJ stenosis(n=1), posterior urethral valve(n=1), urachal remnant(n=1) and bladder diverticula(n=1). Congenital urinary anomalies other than VUR were detected in 9 children among 65 patients with UTI(13.8%). 4 children among 9 congenital urinary anomalies other than VUR were combined with VUR. Sex distribution with congenital urinary anomalies other than VUR was more prevalent in male than female (7 males : 2 females). Age distribution at the time of UTI was less than 5 years in most patient (under 1 year in 1 patient, 1-2 year in 5 patients, 3-5 year in 1 patient, and above 5 year in 2 patients). And age distribution at the time of UTl associated with VUR was less than 5 years in most patient (under 1 year in 6 patients, 1-2 year in 8 patients, 3-5 year in 5 patients, and above 5 year in 4 patients), too Conclusion : Because congenital urinary anomalies other than VUR are seen in as high as 13.8% of patients, more careful evaluation of all possible congenital urinary anomalies as well as VUR is mandatory in pediatric patient with UTI.
Kang Hee-Gyung;Kim Nam-Hee;Kang Ju-Hyung;Ha Il-Soo;Cheong Hae-Il;Choi Yong
Childhood Kidney Diseases
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v.8
no.2
/
pp.223-228
/
2004
Purpose and Methods: Urinary tract infection(UTI) is one of the most important diseases of childhood, especially for young infants. To characterize the patients diagnosed with febrile UTI in their first 6 months of life and to explore the risk factors of recurrent UTI, a retrospective study was performed. Results: Among the 90 patients studied, 77 were boys(86%). First episodes of UTI were diagnosed at the age of $2.5{\pm}1.4$ months. These patients underwent ultrasonographic evaluation of urinary tract(n=90) and voiding cystourethrography(n=81) where 53 and 35 studies showed abnormal findings respectively, and a total of 45 cases of urinary tract anomaly including vesicoureteral reflux(VUR, n=35) were diagnosed. Normal findings on ultrasonography indicated decreased risk of VUR in boys of 1-3 months of age(n=30). 53 patients were followed up more than 6 months and 45 episodes of subsequent UTI developed in 29 patients during the first 6-month period. Patients with relapse were older than patients without relapse at the diagnosis of first UTI, but other clinical parameters including abnormal findings on the imaging studies and prophylactic antibiotics prescription were not different between the two groups. Conclusion: UTI in early infancy occurred mainly in male infants and half of the patients had structural anomalies. USG was of clinical value in detecting anomalies requiring surgical intervention, and to rule out high grade VUR in 1-3 months old boys. Results of the imaging study or prophylactic antibiotics could not modify the risk of recurrent UTI. (J Korean Soc Pediatr Nephrol 2004;8:223-228)
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