| 1. |
- Abrahamsson, Kate, 1959, et al.
(författare)
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Ultrasonography and renography to visualize upper urinary tract in children with meningomyelocele - A prospective study.
- 2012
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Ingår i: Journal of pediatric urology. - : Elsevier BV. - 1873-4898 .- 1477-5131. ; 8:2, s. 174-176
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: Ultrasonography (US) is commonly used to visualize the upper urinary tract in children and adolescents with meningomyelocele (MMC). The aim of this investigation was to prospectively evaluate US in those with spinal angulation or obesity and compare it to the corresponding results obtained by mercaptoacetyltriglycine renography. PATIENTS AND METHODS: Twenty-five children and adolescents with MMC and pronounced angulation of the spine or obesity, were prospectively investigated with both US and renography during the period 2006 to 2008. RESULTS: In 13 (52%) patients the kidneys could not be fully evaluated; in 4 (16%) neither renal size nor pelvic dilation, in 12 (48%) renal length and in 5 (20%) dilation was not accessible. In 23 individuals where dilatation could be evaluated uni- or bilaterally, US was compared to OEE% (%outflow excretion efficiency) at renography. In 1 of these individuals there was normal OEE% while slight dilatation on US was noticed. In 2/15 individuals, split function at renography did not correlate with renal length on US. CONCLUSION: Severe spinal angulation and obesity in individuals with MMC reduced the possibility to evaluate the urinary tract by US. However, it seems that renography could be a reliable alternative to evaluate renal condition in those patients where US is insufficient.
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| 2. |
- Brandström, Per, 1959, et al.
(författare)
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Njurskada hos barn randomiserade till profylax, endoskopisk injektion eller observation. Resultat från Svenska Refluxstudien : Renal damage in childen randomized to prophylaxis, endoscopic injection or surveillance. Results from the Swedixh Reflux Study.
- 2009
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Ingår i: Konferensprogram, 43rd Annual Scientific Meeting of the European Society for Paediatric Nephrology. 2-5 september 2009, Birmingham, England..
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Objectives and Study: To compare the risk of renal damage in children with dilated vesicoureteral reflux (VUR) grade III-IV randomized to antibiotic prophylaxis, endoscopic injection or surveillance. Methods: Children 1-2 years of age with VUR III-IV were randomized to one of the three treatment arms. Voiding cystourethrography (VCUG) and DMSA scintigraphy were performed at entry and after 2 years. End points were febrile urinary tract infections (UTI), development of renal damage and VUR. Abnormality on DMSA was defined as a focal defect with split function of 45% or more (class 1), split funtion 40-44% irrespective of focal defects (class 2), or split funtion <40% (class 3). Progress of damage was defined as a decrease in split function of 3% or more, and new damage reduced uptake in a previously normal area of the kidney. Results: The included 203 children were allocated to prophylaxis (n=69), endoscopic treatment (n=66), and surveillance (n=68). At entry 123 patients had an abnormal DMSA; 18 of these were bilateral. At the 2 year DMSA, 23 showed progress of damage with no difference between treatment arms. Progress of renal damage was seen in 12 of 49 (24%) children with febrile recurrences as compared to 11 of 154 (7%) in those without febrile recurrences (p<0.001). New renal damage was seen in 10 of 49 (20%) children with febrile recurrences as compared to 4 of 154(2.5%) of those without febrile recurrences (p<0.0001). Conclusions: New damage occurred significantly more often in the surveillance and endoscopic groups than in the prophylaxis group. There was no difference in progress of renal damage between the three treatment arms. The risk of progress of renal damage as well as development of new renal damage was significantly correlated to the rate of recurrent febrile UTIs. In this study of small children with VUR grade III-IV antibacterial prophylaxis reduced the risk of new renal damage and recurrent UTI.
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| 3. |
- Brandström, Per, 1959, et al.
(författare)
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Renal damage in children randomized to prophylaxis, endoscopic injection, or surveillance
- 2010
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Ingår i: European Society for Paediatric Urology Annual Meeting, 28 april-1 maj 2010, Antalya, Turkiet.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- PURPOSE To compare the development of new renal damage in small children with dilating vesicoureteral reflux randomly allocated to antibiotic prophylaxis, endoscopic treatment or surveillance (control group). MATERIAL AND METHODS Included were 203 children, 128 girls and 75 boys, aged 1 to less than 2 years with reflux grade III to IV. Voiding cystourethrography and 99mTcdimercaptosuccinic acid scintigraphy were performed before randomization and after 2 years. Febrile urinary tract infections were recorded during the follow-up. Data analysis was performed according to the intention-to-treat principle. RESULTS New renal damage in a previously unscarred area was seen in 15 children, 13 girls and 2 boys. Eight of these 13 girls were in the surveillance, 5 in the endoscopic, and none in the prophylaxis group (p=0.0155). New damage was seen more often in children with (11/49, 22%) than without (4/152, 3%) febrile recurrence (p<0.0001). CONCLUSIONS In boys the rate of new renal damage was low. It was significantly higher in girls, being most frequent in the surveillance (control) group. There was also a strong association between febrile UTI recurrence and development of new renal damage in girls.
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| 4. |
- Brandström, Per, 1959, et al.
(författare)
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The Swedish Reflux Trial in Children: I. Study Design and Study Population Characteristics
- 2010
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Ingår i: Journal of Urology. - : Ovid Technologies (Wolters Kluwer Health). - 0022-5347 .- 1527-3792. ; 184:1, s. 274-279
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Konferensbidrag (refereegranskat)abstract
- Purpose: We compared the rates of febrile urinary tract infection, kidney damage and reflux resolution in children with vesicoureteral reflux treated in 3 ways, including antibiotic prophylaxis, endoscopic therapy and surveillance with antibiotics only for symptomatic urinary tract infection. Materials and Methods: Children 1 to younger than 2 years with grade reflux were recruited into this prospective, open, randomized, controlled, multi-center study and followed for 2 years after randomization. The main study end points were recurrent febrile urinary tract infection, renal status on dimercaptosuccinic acid scintigraphy and reflux status. Outcomes were analyzed by the intent to treat principle. Results: During a 6-year period 128 girls and 75 boys entered the study. In 96% of cases reflux was detected after urinary tract infection. The randomization procedure was successful and resulted in 3 groups matched for relevant factors. Recruitment was slower than anticipated but after patients were entered adherence to the protocol was good. Of the children 93% were followed for the intended 2 years without a treatment arm change. All except 2 patients completed 2-year followup scintigraphy. Conclusions: Recruitment was difficult but a substantial number of children were entered and randomly assigned to 3 groups with similar basic characteristics. Good adherence to the protocol made it possible to address the central study questions.
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| 5. |
- Brandström, Per, 1959, et al.
(författare)
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The Swedish Reflux Trial in Children: IV. Renal Damage.
- 2010
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Ingår i: The Journal of urology. - : Ovid Technologies (Wolters Kluwer Health). - 1527-3792 .- 0022-5347. ; 184:1, s. 292-297
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: We compared the development of new renal damage in small children with dilating vesicoureteral reflux randomly allocated to antibiotic prophylaxis, endoscopic treatment or surveillance as the control group. MATERIALS AND METHODS: Included in the study were 128 girls and 75 boys 1 to younger than 2 years with grade III-IV reflux. Voiding cystourethrography and dimercapto-succinic acid scintigraphy were done before randomization and after 2 years. Febrile urinary tract infections were recorded during followup. Data analysis was done by the intent to treat principle. RESULTS: New renal damage in a previously unscarred area was seen in 13 girls and 2 boys. Eight of the 13 girls were on surveillance, 5 received endoscopic therapy and none were on prophylaxis (p = 0.0155). New damage was more common in children with than without febrile recurrence (11 of 49 or 22% vs 4 of 152 or 3%, p <0.0001). CONCLUSIONS: In boys the rate of new renal damage was low. It was significantly higher in girls and most common in the control surveillance group. There was also a strong association between recurrent febrile UTIs and new renal damage in girls.
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| 6. |
- Hahn, Gabriele, et al.
(författare)
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Pharmacokinetics and safety of gadobutrol-enhanced magnetic resonance imaging in pediatric patients
- 2009
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Ingår i: Investigative Radiology. - 0020-9996 .- 1536-0210. ; 44:12, s. 776-783
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVES: This clinical study investigated the pharmacokinetics and safety of gadobutrol, a magnetic resonance (MR) imaging extracellular contrast agent, in pediatric patients aged 2 to 17 years. MATERIALS AND METHODS: In this open-label, multicenter study, patients scheduled for routine contrast-enhanced MR imaging of the brain, spine, liver or kidney, or MR angiography received a single intravenous injection of gadobutrol (0.1 mmol/kg/0.1 mL/kg). Patients were stratified by age groups (2-6, 7-11, and 12-17 years). Blood and urine samples were collected at prespecified time points and analyzed for gadolinium concentrations. Plasma data were evaluated by means of a nonlinear mixed effects model, and urine data were analyzed using descriptive statistics. In addition, the safety of gadobutrol was evaluated. RESULTS: A total of 130 patients (2-6 years, n = 45; 7-11 years, n = 39; 12-17 years, n = 46) were included in the final population pharmacokinetic analysis. Gadobutrol pharmacokinetics in children aged 2 to 17 years were adequately described by an open 2-compartment model with elimination from the central compartment. The median estimates (2.5th percentile, 97.5th percentile) of body weight-normalized total body clearance (L/h/kg) per age group were 0.10 (0.05, 0.17) for all ages, 0.13 (0.09, 0.17) in the 2 to 6 year age group, 0.10 (0.05, 0.17) in the 7 to 11 year age group and 0.09 (0.05, 0.10) in the 12 to 17 year age group. The body weight-normalized median estimates of total volume of distribution (L/kg) were 0.20 (0.12, 0.28) for all ages, 0.24 (0.20, 0.28) in the 2 to 6 year age group, 0.19 (0.14, 0.23) in the 7 to 11 year age group and 0.18 (0.092, 0.23) in the 12 to 17 year age group. Median gadolinium plasma concentrations at 20 minutes postinjection were simulated using the population pharmacokinetic model and ranged from 414 (13 kg subject) to 518 micromol/L (65 kg subject). Body weight was identified as the major covariate influencing the pharmacokinetic parameters of total body clearance and central volume of distribution. Age was not found to be an additional independent parameter. The median amount of renally excreted gadolinium was 77.0% of the administered dose within 6 hours postinjection, indicating that gadobutrol was renally excreted in this pediatric population aged 2 to 17 years. Gadobutrol was well tolerated, with drug-related adverse events of mild intensity reported for 8 (5.8%) of 138 patients. CONCLUSIONS: Observed differences in pharmacokinetics were attributed to body weight, with no additional independent effect of age. Thus, no dose adjustment from the standard dose of gadobutrol in adults based on body weight (0.1 mmol/kg) is necessary in pediatric patients aged 2 to 17 years. Gadobutrol was safe and well tolerated in the pediatric population in this study.
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| 7. |
- Hansson, Sverker, 1946, et al.
(författare)
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Dimercapto-succinic acid scintigraphy instead of voiding cystourethrography for infants with urinary tract infection.
- 2004
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Ingår i: The Journal of urology. - : Ovid Technologies (Wolters Kluwer Health). - 0022-5347 .- 1527-3792. ; 172:3
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: We study the ability of dimercapto-succinic acid (DMSA) scintigraphy to predict the presence of dilating vesicoureteral reflux (VUR) in infants with urinary tract infection (UTI) to simplify the evaluation protocol. MATERIALS AND METHODS: A retrospective analysis of the records of 303 children younger than 2 years with initial UTI investigated with DMSA scintigraphy and voiding cystourethrography (VCU) within 3 months after UTI was performed. RESULTS: In 156 of the 303 children (51%) DMSA scintigraphy showed renal lesions. VUR was found in 80 patients (26%) and VUR grade significantly correlated with the presence of renal lesions. A normal DMSA scintigraphy and dilating VUR (grade III) occurred in 7 infants. At followup after 1 to 2 years, 6 of these 7 patients had normal DMSA scans and 1 had a scarred duplex kidney. VUR resolved spontaneously in 5 and improved spontaneously to grade 1 in 2 patients. None of the 7 children had recurrent UTI. CONCLUSIONS: DMSA scintigraphy in infants with UTI may replace VCU as a first line investigation. A strategy to perform VCU in only patients with renal lesions is proposed. In this study 147 of 303 VCUs would have been unnecessary as only 1 child with a damaged kidney was missed.
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| 8. |
- Hellström, Mikael, 1950, et al.
(författare)
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Urinary tract infections
- 2009
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Ingår i: Urogenital imaging – a problem-oriented approach. Editors: Morcos S and Thomsen HS.. - : Wiley-Blackwell Publishing Company. ; , s. 149-194
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 9. |
- Holmdahl, Gundela, 1956, et al.
(författare)
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The Swedish Reflux Trial in Children: II. Vesicoureteral Reflux Outcome.
- 2010
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Ingår i: The Journal of urology. - : Ovid Technologies (Wolters Kluwer Health). - 1527-3792 .- 0022-5347. ; 184:1, s. 280-285
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: We compared reflux status in children with dilating vesicoureteral reflux treated in 3 groups, including low dose antibiotic prophylaxis, endoscopic therapy and a surveillance group on antibiotic treatment only for febrile urinary tract infection. MATERIALS AND METHODS: A total of 203 children 1 to younger than 2 years with grade III-IV reflux were recruited into this open, randomized, controlled trial. Endoscopic treatment was done with dextranomer/hyaluronic acid copolymer. The main end point was reflux status after 2 years. Data were analyzed by the intent to treat principle. RESULTS: Reflux status improved in all 3 treatment arms. Of patients in the prophylaxis, endoscopic and surveillance groups 39%, 71% and 47%, respectively, had reflux resolution or downgrading to grade I-II after 2 years. This was significantly more common in the endoscopic than in the prophylaxis and surveillance groups (p = 0.0002 and 0.0030, respectively). After 1 or 2 injections 86% of patients in the endoscopic group had no or grade I-II reflux but recurrent dilating reflux was seen in 20% after 2 years. CONCLUSIONS: Endoscopic treatment resulted in dilating reflux resolution or downgrading in most treated children. After 2 years endoscopic treatment results were significantly better than the spontaneous resolution rate or downgrading in the prophylaxis and surveillance groups. However, of concern is the common reappearance of dilating reflux after 2 years.
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| 10. |
- Karlsson, Ann-Katrine, 1950, et al.
(författare)
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Measurements of total and regional body composition in preschool children: A comparison of MRI, DXA, and anthropometric data.
- 2013
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Ingår i: Obesity (Silver Spring, Md.). - : Wiley. - 1930-739X .- 1930-7381. ; 21:5, s. 1018-24
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Tidskriftsartikel (refereegranskat)abstract
- There are clear sex differences in the distribution of visceral adipose tissue (VAT) and subcutaneous adipose tissue (SAT) in adults, with males having more VAT and less SAT than females. This study assessed whether these differences between the sexes were already present in preschool children. It also evaluated which measures of body composition were most appropriate for assessing abdominal obesity in this age group.
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| 11. |
- Kullberg, Joel, et al.
(författare)
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Adipose tissue distribution in children: automated quantification using water and fat MRI.
- 2010
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Ingår i: Journal of magnetic resonance imaging : JMRI. - : Wiley. - 1522-2586 .- 1053-1807. ; 32:1, s. 204-10
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To develop and validate a method for rapid acquisition and automated processing of magnetic resonance (MR) images for analysis of abdominal adipose tissue distribution in children. Materials and Methods: The study included 21 (10 girls, 11 boys) healthy 5-year-old children. Rapid water and fat MR imaging (6 sec) was performed using a 2-point-Dixon technique on a 1.5T MR scanner using an 8-channel cardiac coil. An automated image processing algorithm was developed for automated segmentation of visceral adipose tissue (VAT) and subcutaneous adipose tissue (SAT), respectively. The results from the fully automated analysis were compared to those from a semiautomated analysis, performed by three operators, from the same images. Results: The automated analysis was seen to give results with strong correlation to the reference measurements (r ≥ 0.997); however, the SAT volume was underestimated by 9.4 ± 3.8%. The accuracy of the automated segmentation of VAT and SAT (TP: true positive, FP: false positive, mean ± SD, %) was TP: 83.6 ± 8.5, FP: 12.7 ± 6.8; and TP: 89.9 ± 3.6, FP: 0.7 ± 0.3, respectively.
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| 12. |
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| 13. |
- Nordenström, Josefin, et al.
(författare)
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The Swedish Infant High-grade Reflux Trial - Bladder function.
- 2017
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Ingår i: Journal of pediatric urology. - : Elsevier BV. - 1873-4898 .- 1477-5131. ; 13:2, s. 139-145
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Tidskriftsartikel (refereegranskat)abstract
- It has been suggested that infants with high-grade vesicoureteral reflux (VUR) have lower urinary tract dysfunction (LUTD) that is characterised by large bladder capacity (BC) and increased post-void residual (PVR). However, most of these infants have normal or small BC in early infancy and develop large capacity during the first year of life.This study aimed to see whether LUTD development during the infant years in children with high-grade VUR could be prevented by early reflux resolution.For early VUR intervention, endoscopic treatment (ET) was used in a randomised trial comprising 77 infants (55 boys) aged <8 months with VUR grade 4-5 (n=30/n=47); 39 were randomised to antibiotic prophylaxis and 38 to ET. Voiding cystourethrogram, free voiding observation (FVO) and renal scintigraphy were performed at baseline and after 1 year. Bladder capacity and PVR were obtained from FVO. LUTD was defined as a BC of ≥150% of expected and a PVR of ≥20ml.There were no differences in bladder function variables seen between the treatment groups, despite significant differences in VUR resolution. Analysing bladder function related to VUR outcome (VUR grade ≤2 vs grade >2), independent of treatment, showed that VUR grade ≤2 was associated with a smaller BC at 1 year (P=0.050) (a tendency already seen at baseline) and a lower PVR at baseline (P=0.010). PVR increased from baseline to 1 year (P=0.037) in children with grade ≤2 VUR (Summary Table). The group with persistent bilateral grade 5 VUR at 1 year had more abnormal bladder variables compared with other study subjects, with a tendency of larger BC (P=0.057), higher PVR (P=0.0073) and more LUTD (P=0.029) at baseline and a larger BC at 1 year (P=0.016). In explanatory analyses, using logistic regression, a high PVR at baseline was identified as a predictor of VUR grade >2 (P=0.046), persistent bilateral grade 5 VUR (P=0.022), recurrent urinary tract infection (P=0.034), and only a tendency was seen regarding new renal damage (P=0.053).There was no between-group difference seen in bladder function. In children with VUR resolution at follow-up, independent of treatment, BC decreased, whereas PVR increased. High PVR at baseline was a predictive factor for both non-resolution of high-grade VUR and recurrent urinary tract infection. The results suggest that LUTD cannot be prevented by early VUR resolution, but rather is an important prognostic factor for VUR outcome in both endoscopic and prophylactic treatment.
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| 14. |
- Nordenström, Josefin, et al.
(författare)
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The Swedish infant high-grade reflux trial: Study presentation and vesicoureteral reflux outcome.
- 2017
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Ingår i: Journal of pediatric urology. - : Elsevier BV. - 1873-4898 .- 1477-5131. ; 13:2, s. 130-138
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Tidskriftsartikel (refereegranskat)abstract
- High-grade vesicoureteral reflux (VUR) in infants is associated with congenital renal abnormalities, recurrent UTI, and bladder dysfunction. Endoscopic treatment (ET) is a well-established method in children with low to moderate reflux grades, but there is a lack of randomised controlled trials regarding the use of ET versus continuous antibiotic prophylaxis in infants with high-grade VUR.This study aimed to determine whether high-grade VUR in infants can be treated with endoscopic injection and whether ET is superior to antibiotic prophylaxis in the treatment of VUR.This prospective, randomised, controlled, multicentre, 1-year follow-up trial comprised 77 infants (55 boys, 22 girls) <8 months of age with VUR grade 4-5 (n=30/n=47). Of the infants, 52 (68%) had bilateral VUR. Thirty-nine were randomised to antibiotic prophylaxis and 38 to ET (with prophylaxis until resolution). Voiding cystourethrogram, ultrasound, renal scintigraphy, and free voiding observation were performed at study entry and after 1 year to evaluate VUR grade, and renal and bladder function.VUR grade ≤2 was seen in 22 (59%) infants in the endoscopy group and eight (21%) in the prophylaxis group at follow-up (p=0.0014). The success rate in the endoscopy group was 100% in unilateral grade 4, falling to 31% in bilateral grade 5 (p=0.0094). Correspondingly, the results in the prophylaxis group were 40% in grade 4 down to 0% in bilateral grade 5 (p=0.037) (Table). Logistic regression analyses identified ET, VUR grade 4, unilaterality, and low residual urine at baseline as positive predictors of VUR down-grading to ≤2 (area under ROC curve 0.88). In four patients with reflux resolution after one injection, dilating reflux recurred at the 1-year follow-up. One patient had a UTI possibly related to ET. In our material four patients required re-implantation, of whom one was obstructive after injection.The opportunity to offer even small infants with high-grade VUR an alternative, minimally invasive treatment option is a great advance in paediatric urology. In this high-risk group, bilateral VUR grade 5 stands out with its poor bladder function and low chance of resolution. The recurrence rate of dilating VUR aftersuccessful ET is consistent with previous studies. The limitations are the relatively small number of patients and the short follow-up.High-grade VUR in infants can be treated with injection therapy and the resolution rate is higher than that of prophylaxis treatment. The complication rate is low and VUR grade 4, unilaterality, and low residual urine are favourable for the resolution and down-grading of VUR.
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| 15. |
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| 16. |
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| 17. |
- Preda, Iulian, 1969, et al.
(författare)
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Value of ultrasound in evaluation of infants with first urinary tract infection.
- 2010
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Ingår i: The Journal of urology. - : Ovid Technologies (Wolters Kluwer Health). - 1527-3792 .- 0022-5347. ; 183:5, s. 1984-1988
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: We evaluated the role of ultrasound in diagnosing and treating infants with a first urinary tract infection with a focus on important structural abnormalities. MATERIALS AND METHODS: In a setting of limited prenatal ultrasound screening this population based, prospective, 3-year study included 161 male and 129 female infants. Ultrasound and dimercapto-succinic acid scintigraphy were performed as initial investigations and voiding cystourethrography was conducted within 2 months. RESULTS: Ultrasound revealed dilatation in 15% of patients and increased kidney length in 28%. Sensitivity for detecting scintigraphic abnormality was 48%. Renal length was significantly correlated to inflammatory parameters, including scintigraphic abnormalities. Important structural abnormalities were detected in 40 cases, with 30 on ultrasound, while 10 of 27 cases of dilating reflux (mostly grade III) were missed. Outside the study there were 28 additional cases of structural abnormality, of which 15 were detected prenatally. CONCLUSIONS: Ultrasound detected most structural abnormalities except grade III reflux. Since it is noninvasive, ultrasound has a place in the evaluation of infants with urinary tract infection, especially in the absence of prenatal ultrasound during late pregnancy. Kidney length in infants with acute infection correlated with inflammatory parameters, and the clinical importance of this finding needs to be studied further.
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| 18. |
- Simrén, Yvonne, 1966, et al.
(författare)
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Diffusion tensor imaging based multiparametric characterization of renal lesions in infants with urinary tract infections: an explorative study
- 2021
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Ingår i: Bmc Pediatrics. - : Springer Science and Business Media LLC. - 1471-2431. ; 21:1
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Tidskriftsartikel (refereegranskat)abstract
- Background Conventional diffusion weighted imaging (DWI) is a promising non-invasive tool in the evaluation of infants with symptomatic urinary tract infections (UTI). The use of multiparametric diffusion tensor imaging (DTI) provides further information on renal pathology by reflecting renal microstructure. However, its potential to characterize and distinguish between renal lesions, such as acute pyelonephritic lesions, permanent renal damages or dysplastic changes has not been shown. This study aimed to evaluate the potential of multiparametric DTI for characterization of renal lesions with purpose to distinguish acute pyelonephritis from other renal lesions in young infants with their first UTI. Methods Nine kidneys in seven infants, age 1.0-5.6 months, with renal lesions i.e. uptake reductions, on acute scintigraphy performed after their first UTI, were included. The DTI examinations were performed during free breathing without sedation. The signal in the lesions and in normal renal tissue was measured in the following images: b0, b700, apparent diffusion coefficient (ADC), and fractional anisotropy (FA). In addition, DTI tractographies were produced for visibility. Results There was a difference between lesions and normal tissue in b700 signal (197 +/- 52 and 164 +/- 53, p = 0.011), ADC (1.22 +/- 0.11 and 1.45 +/- 0.15 mm(2)/s, p = 0.008), and FA (0.18 +/- 0.03 and 0.30 +/- 0.10, p = 0.008) for all nine kidneys. Six kidneys had focal lesions with increased b700 signal, decreased ADC and FA indicating acute inflammation. In three patients, the multiparametric characteristics of the lesions were diverging. Conclusion Multiparametric DTI has the potential to further characterize and distinguish acute pyelonephritis from other renal lesions in infants with symptomatic UTI.
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| 19. |
- Simrén, Yvonne, 1966, et al.
(författare)
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Diffusion weighted imaging is a promising method to detect acute pyelonephritis in non-sedated free breathing infants
- 2020
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Ingår i: Journal of Pediatric Urology. - : Elsevier BV. - 1477-5131. ; 16, s. 320-325
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Tidskriftsartikel (refereegranskat)abstract
- Introduction: Urinary tract infection (UTI) is a common disease in infants. The initial evaluation includes imaging to identify risk factors for permanent renal damage, such as malformation and renal parenchymal involvement of the infection i.e. pyelonephritis. 99mTc-Dimercaptosuccinic acid (DMSA) scintigraphy is a well-established method for detection of pyelonephritis and renal damage, but has limitations in availability, spatial resolution, and detection of congenital malformations. Diffusion weighted magnetic resonance imaging (DWI) has been shown to have a high sensitivity for detection of pyelonephritis in children without the use of invasive procedures, contrast agents or ionizing radiation. How this method performs in young infants during non-sedated free breathing remains, however, to be investigated. Objective: To prospectively assess the feasibility and performance of DWI for detection of pyelonephritis in non-sedated free breathing infants. Methods: 32 children <6 months of age with first-time symptomatic UTI were examined with DWI and DMSA scintigraphy. The DWI examination was performed using a free breathing protocol without the use of sedation. Pyelonephritic lesions were registered for both methods by independent observers. Agreement between DWI and DMSA was evaluated. Consensus diagnosis was determined and compared to the DWI findings. Results: The MRI and DMSA examinations were completed in 25 infants, with a median age of 1.7 (0.7–5.5) months. Focal uptake reductions were detected on the DMSA images in 12 (24%) of the 50 kidneys. The DWI method demonstrated a fair to good agreement with DMSA, k = 0.50 (p < 0.0001). The consensus diagnosis was pyelonephritis in eight (16%) of the 50 kidneys. DWI detected seven of the eight kidneys with pyelonephritis. No false positive findings were detected with DWI compared to consensus diagnosis. Discussion: This study has shown an agreement between DWI and DMSA scintigraphy in the detection of pyelonephritis. Further validation of the performance of DWI, using a consensus diagnosis as a reference, confirmed the potential of the method. This feasibility study included a limited number of patients and the results need to be confirmed in a prospective study of a larger cohort. Conclusion: Free breathing DWI is a promising method for detection of pyelonephritic lesions in non-sedated infants.[Formula presented] © 2020 Journal of Pediatric Urology Company
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| 20. |
- Simrén, Yvonne, 1966, et al.
(författare)
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Renal swelling indicates renal damage in infants with their first urinary tract infection
- 2018
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Ingår i: Acta Paediatrica. - : Wiley. - 0803-5253. ; 107:11, s. 2004-2010
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Tidskriftsartikel (refereegranskat)abstract
- Aim: We used ultrasound to evaluate renal swelling as a predictor of acute and permanent renal damage in infants with their first urinary tract infection (UTI). Methods: The cohort at the Queen Silvia Children's Hospital, Gothenburg, Sweden, comprised 101 infants with their first UTI at a mean age of 3.9 +/- 3.0 months. Acute and follow-up ultrasounds were carried out a few days and one month after treatment started, and a (99m)technetium dimercaptosuccinic acid (DMSA) scan was carried out after one month and after a year if the first scan was abnormal. Results: The acute ultrasounds showed that renal length and volume, calculated as standard deviation scores (SDS), were 1.39 +/- 1.43 SDS and 1.30 +/- 1.08 SDS. We found that 52% of the one-month DMSA scans and 25% of the one-year DMSA scans were abnormal. Renal length (p = 0.0026) and initial volume (p = 0.0005) on the ultrasound predicted acute renal damage at the one-month DMSA scan and initial renal length (p = 0.030) predicted permanent renal damage at the one-year DMSA scan. Conclusion: Renal swelling was associated with renal damage. Although the diagnostic performance compared with the DMSA scan was weak, renal swelling may help clinicians to make decisions about further investigations and follow-ups of infants with UTIs.
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| 21. |
- Simrén, Yvonne, 1966, et al.
(författare)
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Ultrasound is an effective and noninvasive method of evaluating renal swelling in infants with their first urinary tract infection
- 2017
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Ingår i: Acta Paediatrica. - : Wiley. - 0803-5253. ; 106:11, s. 1868-1874
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Tidskriftsartikel (refereegranskat)abstract
- Aim: This study evaluated renal swelling in infants with a first urinary tract infection (UTI) by correlating renal length and volume with C-reactive protein (CRP) and body temperature. Methods: Ultrasounds were carried out on 104 infants at The Queen Silvia Children's Hospital, Gothenburg, Sweden - 58 boys (mean age 3.3 months) and 46 girls (mean age 4.8 months) - during the acute phase of their UTI. A second scan was performed on 94 of them 4 weeks later. Renal length and volume were computed to standard deviation scores (SDS). Results: The mean renal length and volume at the first ultrasound were 1.90 SDS (1.54) and 1.67 SDS (+/- 1.13) for the larger kidney and 0.86 SDS (+/- 1.01) and 0.84 SDS (+/- 0.90) for the smaller kidney. There was a significant decrease in renal length and volume between the two ultrasounds, with a mean difference of 0.96 SDS (+/- 1.24) and 1.07 SDS (+/- 1.10) for the larger kidney (p < 0.0001). The length and volume of the larger kidney correlated with CRP (p < 0.001), but only the renal length correlated with fever (p < 0.001). Conclusion: Early ultrasound determined renal swelling in infants with a UTI and may be a valuable noninvasive way of identifying infants with renal parenchymal involvement.
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| 22. |
- Sjöström, Sofia, 1968, et al.
(författare)
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Predictive factors for resolution of congenital high grade vesicoureteral reflux in infants: results of univariate and multivariate analyses.
- 2010
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Ingår i: The Journal of urology. - : Ovid Technologies (Wolters Kluwer Health). - 1527-3792 .- 0022-5347. ; 183:3, s. 1177-84
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: We studied variables with impact on cessation of congenital high grade vesicoureteral reflux in univariate analyses and provide a multivariate model for prediction of reflux resolution. MATERIALS AND METHODS: A total of 80 male and 35 female infants (median age 2.7 months) were included in this prospective observational study. Of the cases 71% were diagnosed after urinary tract infection and 26% after prenatal ultrasound. Reflux was bilateral in 70% of the patients and maximum grade was III in 16%, IV in 45% and V in 39%. The study protocol included repeat videocystometries, renal scintigrams, chromium edetic acid clearances and free voiding observations. Median followup was 36 months. RESULTS: Overall spontaneous reflux resolution, including cases downgraded to grade I to II, was 38%. Variables significantly negatively correlated to resolution were breakthrough febrile urinary tract infection, bladder dysfunction, higher grade of reflux at inclusion, renal abnormality, subnormal renal function, increased bladder capacity, residual urine and passive occurrence of reflux. Multivariate Cox proportional hazard model with stepwise selection identified 3 independent predictors--renal abnormality (hazard ratio 0.45, 95% CI 0.31-0.64, p <0.0001), bladder dysfunction (hazard ratio 0.43, 95% CI 0.29-0.64, p <0.0001) and breakthrough urinary tract infection (hazard ratio 0.38, 95% CI 0.18-0.78, p = 0.009). Performance of the model was evaluated by the receiver operating characteristic curve, with a calculated area under the curve of 83%. CONCLUSIONS: Overall resolution rate in congenital high grade vesicoureteral reflux is high during the first years of life. By multivariate analyses renal abnormality, bladder dysfunction and breakthrough febrile urinary tract infection were identified as strong independent negative predictive factors for reflux resolution.
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| 23. |
- Sjöström, Sofia, 1968, et al.
(författare)
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Spontaneous resolution of high grade infantile vesicoureteral reflux.
- 2004
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Ingår i: The Journal of urology. - : Ovid Technologies (Wolters Kluwer Health). - 0022-5347 .- 1527-3792. ; 172:2
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: We studied the spontaneous resolution rate in a group of infants with high grade vesicoureteral reflux (VUR). The influence of gender, prenatal or postnatal diagnosis, recurrent urinary tract infections (UTIs) and bladder dysfunction on the resolution rate was also evaluated. MATERIALS AND METHODS: This prospective study comprised 115 infants (80 boys and 35 girls) with high grade VUR (grades III to V). Bilateral reflux was seen in 70% of cases. The majority of patients (71%) were diagnosed after UTI during infancy and only 26% were prenatally diagnosed. Median age at diagnosis was 2.7 months. Patients were followed according to a program of repeat video cystometry and noninvasive 4-hour voiding observations. Median followup was 39 months. RESULTS: The overall spontaneous resolution rate to grade II or less for all grades was 39% with no difference between boys and girls. However, when comparing the more severe grades IV and V, we found a significantly higher resolution rate in boys during the infant year. No difference in VUR disappearance could be detected when comparing the groups according to presentation, prenatal ultrasound or pyelonephritis. Breakthrough UTIs were seen in 47% of cases despite antibacterial prophylaxis and they significantly correlated with VUR nonresolution. Bladder dysfunction was found in 37% of patients and it also significantly correlated with nonresolution. CONCLUSIONS: The spontaneous resolution rate for high grade (grades IV and V) congenital VUR was high in boys during the infant year (29%), whereas in girls and boys after the infant year the resolution rate was 9% yearly during followup. Negative prognostic factors for resolution were recurrent UTIs and bladder dysfunction.
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| 24. |
- Stokland, Eira, et al.
(författare)
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Uncomplicated duplex kidney and DMSA scintigraphy in children with urinary tract infection.
- 2007
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Ingår i: Pediatric radiology. - : Springer Science and Business Media LLC. - 0301-0449 .- 1432-1998. ; 37:8, s. 826-8
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Renal duplication is the most common malformation of the urinary tract and is frequently seen among children with urinary tract infection (UTI). OBJECTIVE: To evaluate problems in the interpretation of dimercaptosuccinic acid (DMSA) scintigraphy and to establish the range of relative function in uncomplicated unilateral duplication. MATERIALS AND METHODS: Retrospective analysis of 303 children less than 2 years of age with first time non-obstructive urinary tract infection investigated by both urography and DMSA scintigraphy. At DMSA scintigraphy, renal lesions and/or relative function below 45% was considered abnormal. Urography was used as reference for the diagnosis of duplication. RESULTS: Duplex kidneys were found in 22 of 303 patients (7%). Of the 16 children with unilateral duplication, 10 had bilaterally undamaged kidneys with a range of relative function varying between 51% and 57% in the duplex kidney. In two of the children with unilateral duplication the imaging results were discordant. CONCLUSION: There was risk of underdiagnosis as well as overdiagnosis of renal damage at scintigraphy. Although it is important to be aware of this risk, the rate of misinterpretation was low. A range of 51% to 57% can be used as the limit for normality of the relative function of a unilateral duplex kidney.
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| 25. |
- Swerkersson, Svante, 1954, et al.
(författare)
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Relationship among vesicoureteral reflux, urinary tract infection and renal damage in children.
- 2007
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Ingår i: The Journal of urology. - : Ovid Technologies (Wolters Kluwer Health). - 0022-5347 .- 1527-3792. ; 178:2
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: We studied the relationship among vesicoureteral reflux, urinary tract infection and permanent renal damage in children. MATERIALS AND METHODS: We retrospectively analyzed 303 children younger than 2 years with a first time, nonobstructive, culture verified urinary tract infection. The protocol included ultrasonography and voiding cystourethrography within 3 months after urinary tract infection, and (99m)technetium dimercapto-succinic acid scintigraphy after 1 to 2 years. RESULTS: Vesicoureteral reflux was found in 36 of 163 boys (22%) and in 44 of 140 girls (31%). Of the 303 patients 80 (26%) had permanent renal damage according to dimercapto-succinic acid scintigraphy. The rate of abnormality increased significantly with grade of vesicoureteral reflux in boys and girls. The relative risk of renal damage was significantly increased in patients with vesicoureteral reflux grade II and higher. Maximum C-reactive protein concentration, maximum temperature during urinary tract infection, presence of vesicoureteral reflux and febrile recurrences of urinary tract infection were significantly related to permanent renal damage. In stepwise logistic regression vesicoureteral reflux was the only independent variable for boys, while C-reactive protein and vesicoureteral reflux were independent factors for girls. CONCLUSIONS: There was a significant relationship between grade II vesicoureteral reflux and higher and permanent renal damage in boys and girls. However, while the association between renal damage and vesicoureteral reflux was evident in boys, the role of urinary tract infection and renal inflammation seemed to be equally or more important in girls. These findings support the concept that renal damage is associated with vesicoureteral reflux and is often congenital in boys, while in girls it is more related to urinary tract infection with vesicoureteral reflux as a reinforcing factor.
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| 26. |
- Swerkersson, Svante, 1954, et al.
(författare)
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Urinary tract infection in infants: the significance of low bacterial count.
- 2016
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Ingår i: Pediatric nephrology (Berlin, Germany). - : Springer Science and Business Media LLC. - 1432-198X .- 0931-041X. ; 31:2, s. 239-245
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Tidskriftsartikel (refereegranskat)abstract
- In national guidelines for urinary tract infection (UTI) in children, different cut-off levels for defining bacteriuria are used. In this study, the relationship between bacterial count in infant UTI and inflammatory parameters, frequency of vesicoureteral reflux (VUR), kidney damage, and recurrent UTI was analyzed.
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| 27. |
- Swerkersson, Svante, 1954, et al.
(författare)
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Urinary tract infection in small children: the evolution of renal damage over time
- 2017
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Ingår i: Pediatric Nephrology. - : Springer Science and Business Media LLC. - 0931-041X .- 1432-198X. ; 32:10, s. 1907-1913
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Tidskriftsartikel (refereegranskat)abstract
- Our objective was to analyze the evolution of kidney damage over time in small children with urinary tract infection (UTI) and factors associated with progression of renal damage. From a cohort of 1003 children < 2 years of age with first-time UTI, a retrospective analysis of 103 children was done. Children were selected because of renal damage at index Tc-99m-dimercaptosuccinic acid (DMSA) scintigraphy at least 3 months after UTI, and a late DMSA scan was performed after at least 2 years. Damage was classified as progression when there was a decline in differential renal function (DRF) by ae4%, as regression when there was complete or partial resolution of uptake defects. Of 103 children, 20 showed progression, 20 regression, and 63 remained unchanged. There were no differences between groups regarding gender or age. In the progression group, 16/20 (80%) children had vesicoureteral reflux (VUR) grade III-V and 13 (65%) had recurrent UTI. In multivariable regression analysis, both VUR grade III-V and recurrent UTI were associated with progression. In the regression group, 16/20 (80%) had no VUR or grade I-II, and two (10%) had recurrent UTI. Most small children with febrile UTI do not develop renal damage and if they do the majority remain unchanged or regress over time. However, up to one-fifth of children with renal damage diagnosed after UTI are at risk of renal deterioration. These children are characterized by the presence of VUR grades III-V and recurrent febrile UTI and may benefit from follow-up.
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