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BACKGROUND: The grading of urinary tract dilatation (UTD) on postnatal sonography is a fundamental step to establish rational management for infants with antenatal hydronephrosis (ANH). The aim of this study was to compare the prediction accuracy of UTD grading systems for relevant clinical outcomes. In addition, we propose a refinement of the UTD classification by adding quantitative measurements and evaluate its impact on accuracy. METHODS: Between 1989 and 2019, 447 infants diagnosed with isolated AHN were prospectively followed. The events of interest were surgical interventions and kidney injury. Comparison of performance of the grading systems and the impact on the accuracy of a modified UTD classification (including the size of the kidney parenchyma) was assessed by the area under the receiver-operating characteristic curve (AUC). RESULTS: Of 447 infants, 131 (29%) underwent surgical intervention and 26 (5.8%) had developed kidney injury. The median follow-up time was 9 years (IQ range, 7-12 years). The performance for detecting the need for surgical intervention was excellent for all grading systems (AUC > 0.90). However, for predicting kidney injury, the modified UTD classification exhibited significant improvement in accuracy (AUC = 0.913, 95%CI, 0.883-0.937) as compared with UTD classification (AUC = 0.887, 95%CI, 0.854-0.915) (P = 0.027). CONCLUSIONS: Our study confirms that the hydronephrosis grading systems provide excellent accuracy in discriminating patients who need surgical intervention among infants with AHN. Our findings suggest that the inclusion of kidney parenchymal thickness to UTD classification might increase the accuracy for predicting infants who may develop kidney injury. A higher resolution version of the Graphical abstract is available as Supplementary information.
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Hidronefrose , Sistema Urinário , Dilatação , Feminino , Humanos , Hidronefrose/diagnóstico por imagem , Hidronefrose/etiologia , Lactente , Rim/diagnóstico por imagem , Masculino , Gravidez , Estudos Retrospectivos , Ultrassonografia Pré-Natal , Sistema Urinário/diagnóstico por imagemRESUMO
Introduction: Prenatal ultrasound detects fetal anomalies in 1% of pregnancies, about 20-30% of them are urogenital and among them 50% are fetal urinary tract dilatations (UTD). Objective: To establish the correlation between prenatal and postnatal hydronephrosis diagnosis, as well as to analyze the prognosis. Design, patients, interventions and main outcome measure: Retrospective observational study performed by the Prenatal Diagnosis Unit of Parc Taulí Hospital (Sabadell), which included 177 pregnant women with ultrasound diagnosis of UTD between January 2011 and December 2016. We performed a descriptive analysis of the most important ultrasound and perinatal variables. The main outcome measure was the degree of dilatation of UTD. Results: The prevalence of HNF was 1.17%; 82.8% were diagnosed in the second trimester ultrasound; 42.9% of fetal hydronephrosis cases were bilateral and, in 95.6%, the urogenital pathology was not associated with other malformations. Congenital heart disease was the most frequently associated prenatal anomaly (3.3%). Among 93 low-risk hydronephrosis cases diagnosed in the second trimester, 53.8% resolved spontaneously in the third trimester, 30.1% remained stable and 16.1% worsened. Of the 32 cases of moderate-severe UTD diagnosed in the second trimester, only 9.4% improved in the third trimester. Complementary examination was required in 46.9% of the neonates and 14.1% required surgical intervention. Conclusions: Most cases of fetal hydronephrosis were diagnosed by second trimester ultrasound. Mild UTD presents good prognosis as opposed to moderate-severe cases, which usually persist after birth.
Introducción. La ecografía prenatal permite detectar una anomalía significativa en 1% de los embarazos; de ellos, 20 a 30% son genitourinarias y 50% de estas son hidronefrosis fetales (HNF). Objetivo. Establecer una correlación entre el grado de hidronefrosis prenatal y posnatal, así como analizar las implicaciones pronósticas. Diseño, pacientes, intervenciones y variables principales. Estudio observacional retrospectivo realizado por la Unidad de Diagnóstico Prenatal del hospital Parc Taulí de Sabadell, que incluyó un total de 177 gestantes con diagnóstico ecográfico de HNF entre enero de 2011 y diciembre de 2016. Se realizó un análisis descriptivo de las variables ecográficas y perinatales más importantes. La principal variable de estudio fue el grado de dilatación de la HNF. Resultados. La prevalencia de HNF fue 1,17%. El 82,8% de los casos fue diagnosticado en la ecografía del 2º trimestre. En 42,9%, la afectación fue bilateral, y en 95,6% la malformación renal fue aislada. La cardiopatía fue la anomalía congénita asociada con más frecuencia (3,3%). De las 93 hidronefrosis de riesgo bajo diagnosticadas en el 2º trimestre, 53,8% se normalizaron en el 3er trimestre, 30,1% permanecieron estables y 16,1% progresaron. De los 32 casos de HNF moderadas-severas diagnosticadas en el 2º trimestre, solo 9,4% se normalizaron en el 3er trimestre. El 46,9% de los neonatos precisó exploraciones complementarias y 14,1% intervención quirúrgica. Conclusiones. Existe buena correlación de la HNF prenatal y posnatal. La HNF leve presenta buen pronóstico, mientras que la moderada-severa suele persistir posnatalmente.
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BACKGROUND: Posterior urethral valves (PUVs) are associated with severe consequences to the urinary tract and are a common cause of chronic kidney disease (CKD). The aim of this study was to develop clinical predictive model of CKD in a cohort of patients with PUVs. METHODS: In this retrospective cohort study, 173 patients with PUVs were systematically followed up at a single tertiary unit. The primary endpoint was CKD ≥ stage 3. Survival analyses were performed by Cox regression proportional hazard models with time-fixed and time-dependent covariables. RESULTS: Mean follow-up time was 83 months (SD, 70 months). Sixty-five children (37.6%) developed CKD stage ≥ 3. After adjustment by the time-dependent Cox model, baseline creatinine, nadir creatinine, hypertension, and proteinuria remained as predictors of the endpoint. After adjustment by time-fixed model, three variables were predictors of CKD ≥ stage 3: baseline creatinine, nadir creatinine, and proteinuria. The prognostic risk score was divided into three categories: low-risk (69 children, 39.9%), medium-risk (45, 26%), and high-risk (59, 34.1%). The probability of CKD ≥ stage 3 at 10 years age was estimated as 6%, 40%, and 70% for patients assigned to the low-risk, medium-risk, and high-risk groups, respectively (P < 0.001). The main limitation was the preclusion of some relevant variables, especially bladder dysfunction, that might contribute to a more accurate prediction of renal outcome. CONCLUSION: The model accurately predicts the risk of CKD in PUVs patients. This model could be clinically useful in applying timely intervention and in preventing the impairment of renal function.
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Modelos Biológicos , Insuficiência Renal Crônica/epidemiologia , Uretra/anormalidades , Obstrução Uretral/complicações , Pré-Escolar , Progressão da Doença , Estudos de Viabilidade , Feminino , Seguimentos , Humanos , Lactente , Masculino , Modelos de Riscos Proporcionais , Insuficiência Renal Crônica/etiologia , Estudos Retrospectivos , Medição de Risco/métodos , Fatores de Risco , Análise de Sobrevida , Obstrução Uretral/congênito , Obstrução Uretral/mortalidadeRESUMO
BACKGROUND: Posterior urethral valves (PUVs) constitute the most common infravesical urinary obstruction in boys and are often accompanied by severe consequences to the lower and upper urinary tract. Currently, about two-thirds of diagnosis of PUVs has been suspected by prenatal ultrasonography findings. The aim of this study was to compare long-term clinical outcomes in two groups of patients with PUVs, with antenatal vs. postnatal diagnosis. STUDY DESIGN: This was a retrospective cohort study of 173 patients with PUVs systematically followed up in a tertiary center. Median follow-up time was 66.5 months (interquartile range [IQ], 11.4-147.9 months) for those patients who survived neonatal period. Seventy-nine (45.6%) patients were followed up for more than 5 years and 55 (32%) for more than 10 years. For analysis, the cohort was stratified into two groups according to the clinical presentation (prenatal vs. postnatal). The events of interest were urinary tract infection (UTI), surgical interventions, proteinuria, hypertension, chronic kidney disease (CKD), and death. Survival analyses were performed to evaluate time until occurrence of the events. RESULTS: Sixty-two patients (35.8%) were diagnosed by fetal sonography. Patients of postnatal group presented a higher incidence rate of UTI episodes (6.5, 95% confidence interval [CI], 4.9-8.3) than antenatal group (1.2, 95% CI, 0.4-2.7) (P < 0.001). Thirty-six patients (21%) presented hypertension, and 77 (44.5%) had persistent mild proteinuria. There was no significant difference in the estimated incidence of hypertension (P = 0.28) and proteinuria (P = 0.78) between antenatal and postnatal groups. The cumulative incidence of CKD stage ≥3 was estimated to be about 37% at 10 years of age, and 56% at 18 years of age. By survival analysis, there was no significant difference in the estimated incidence of CKD stage ≥3 (log-rank = 0.32, P = 0.57) and CKD stage 5 (log-rank = 1.08, P = 0.28, Figure) between antenatal and postnatal groups. Of 173 patients included in the analysis, 13 (7.5%) died during follow-up with a median age of 2.6 months (IQ, 15 days-62 months). Survival analyses have not shown any significant difference in the estimated incidence of death between antenatal and postnatal groups (log-rank = 1.38, P = 0.24). CONCLUSION: The study findings did not corroborate the initial hypothesis that the rates of renal function declining in patients with PUVs would be attenuated by an early diagnosis and intervention after antenatal diagnosis.
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Ultrassonografia Pré-Natal , Uretra/anormalidades , Uretra/diagnóstico por imagem , Doenças Urológicas/epidemiologia , Adolescente , Criança , Pré-Escolar , Estudos de Coortes , Feminino , Humanos , Incidência , Lactente , Recém-Nascido , Masculino , Gravidez , Estudos Retrospectivos , Resultado do Tratamento , Uretra/cirurgia , Obstrução Uretral/complicações , Obstrução Uretral/epidemiologia , Obstrução Uretral/cirurgia , Doenças Urológicas/complicações , Doenças Urológicas/cirurgiaRESUMO
OBJECTIVE: To analyze the prenatal outcomes in a cohort of fetuses with mild bilateral pyelectasis and determine whether performing serial ultrasounds is a good follow-up strategy. METHODS: A prospective longitudinal study was conducted on 62 fetuses with mild bilateral pyelectasis. Fetal mild bilateral pyelectasis was considered when the renal pelvis measured (in millimeters) ≥5.0 to 10.0, ≥7.0 to 10.0, and ≥10.0 to 15 at ≤23 weeks 6 days, 24 to 31 weeks 6 days, and ≥32 weeks, respectively, with no uretero-calyceal dilatation. Ultrasounds were performed every 3 weeks to assess whether the mild bilateral pyelectasis regressed, remained unchanged (Group 1) or progressed (Group 2). RESULTS: Group 1 consisted of 53 fetuses (85.4%), and progression was observed in 9 cases (Group 2, 14.6%). The initial renal pelvis diameter was significantly larger in fetuses with progression (p=0.028). Statistically significant differences in the renal pelvis diameter were also found at weeks 31 and 35 for both kidneys (p<0.05). The cases requiring intrauterine procedures or early delivery were not observed. CONCLUSION: Fetal mild bilateral pyelectasis with no calyceal dilatation is a benign condition that can be managed in the postnatal period. The initial renal pelvis diameter and the diameter in week 31 or 35 were valuable parameters for identifying cases that would eventually need specific postnatal procedures.
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Humanos , Masculino , Feminino , Pelve Renal/diagnóstico por imagem , Pelve Renal/patologia , Pielectasia/diagnóstico por imagem , Pielectasia/patologia , Ultrassonografia Pré-Natal/métodos , Dilatação Patológica/diagnóstico por imagem , Progressão da Doença , Feto , Seguimentos , Idade Gestacional , Estudos Longitudinais , Tamanho do Órgão , Estudos Prospectivos , Valores de Referência , Remissão Espontânea , Estatísticas não Paramétricas , Fatores de TempoRESUMO
The advances of knowledge in the clinical course of vesicoureteral reflux and its consequences have allowed an improvement in the management of this common disease in children. In the last years, several facts have contributed for a better understanding of the etiology of reflux and of the associated renal damage. Among them, it is important to emphasize the neonatal diagnosis of the reflux in the investigation of fetal hydronephrosis, the precise detection of renal damage by renal scintigraphy and the advances of the genetic of primary vesicoureteral reflux. The aim of this study is review these aspects and the recent clinical trials...
Os avanços no conhecimento do curso clínico do refluxo vésico-ureteral e de suas consequências têm permitido um aperfeiçoamento na abordagem dessa doença freqüente na faixa etária pediátrica. Nos últimos anos, vários fatores têm contribuído para uma maior compreensão da genêse do refluxo e do dano renal associado. Entre esses destacam-se o diagnóstico neonatal do refluxo na investigação da hidronefrose fetal, a detecção mais precisa do dano renal através da cintilografia renal e os avanços no conhecimento da genética do refluxo vésico-ureteral primário. Esta revisão enfatiza esses avanços e os mais recentes estudos prospectivos controlados abordando a questão do tratamento do refluxo...