RESUMO
OBJECTIVES: To evaluate the diagnostic accuracy of ultrasound elastography with acoustic radiation force impulse (ARFI) to detect congenital hepatic fibrosis and portal hypertension in children with autosomal recessive polycystic kidney disease (ARPKD). STUDY DESIGN: Cross-sectional study of 25 children with ARPKD and 24 healthy controls. Ultrasound ARFI elastography (Acuson S3000, Siemens Medical Solutions USA, Inc, Malvern, Pennsylvania) was performed to measure shear wave speed (SWS) in the right and left liver lobes and the spleen. Liver and spleen SWS were compared in controls vs ARPKD, and ARPKD without vs with portal hypertension. Linear correlations between liver and spleen SWS, spleen length, and platelet counts were analyzed. Receiver operating characteristic analysis was used to evaluate diagnostic accuracy of ultrasound ARFI elastography. RESULTS: Participants with ARPKD had significantly higher median liver and spleen SWS than controls. At a proposed SWS cut-off value of 1.56 m/s, the left liver lobe had the highest sensitivity (92%) and specificity (96%) for distinguishing participants with ARPKD from controls (receiver operating characteristic area 0.92; 95% CI 0.82-1.00). Participants with ARPKD with portal hypertension (splenomegaly and low platelet counts) had significantly higher median liver and spleen stiffness than those without portal hypertension. The left liver lobe also had the highest sensitivity and specificity for distinguishing subjects with ARPKD with portal hypertension. CONCLUSIONS: Ultrasound ARFI elastography of the liver and spleen, particularly of the left liver lobe, is a useful noninvasive biomarker to detect and quantify liver fibrosis and portal hypertension in children with ARPKD.
Assuntos
Técnicas de Imagem por Elasticidade/métodos , Doenças Genéticas Inatas/diagnóstico por imagem , Hipertensão Portal/epidemiologia , Cirrose Hepática/diagnóstico por imagem , Rim Policístico Autossômico Recessivo/diagnóstico por imagem , Rim Policístico Autossômico Recessivo/patologia , Ultrassonografia Doppler/métodos , Adolescente , Criança , Pré-Escolar , Comorbidade , Estudos Transversais , Feminino , Doenças Genéticas Inatas/epidemiologia , Doenças Genéticas Inatas/patologia , Hospitais Pediátricos , Humanos , Hipertensão Portal/diagnóstico por imagem , Hipertensão Portal/patologia , Cirrose Hepática/epidemiologia , Cirrose Hepática/patologia , Masculino , Philadelphia , Rim Policístico Autossômico Recessivo/epidemiologia , Curva ROC , Valores de Referência , Sensibilidade e Especificidade , Índice de Gravidade de DoençaRESUMO
OBJECTIVE: To define glomerular filtration rate (GFR) decline, hypertension (HTN), and proteinuria in subjects with autosomal recessive polycystic kidney disease (ARPKD) and compare with 2 congenital kidney disease control groups in the Chronic Kidney Disease in Children cohort. STUDY DESIGN: GFR decline (iohexol clearance), rates of HTN (ambulatory/casual blood pressures), antihypertensive medication usage, left ventricular hypertrophy, and proteinuria were analyzed in subjects with ARPKD (n = 22) and 2 control groups: aplastic/hypoplastic/dysplastic disorders (n = 44) and obstructive uropathies (n = 44). Differences between study groups were examined with the Wilcoxon rank sum test. RESULTS: Annualized GFR change in subjects with ARPKD was -1.4 mL/min/1.73 m(2) (-6%), with greater decline in subjects age ≥ 10 years (-11.5%). However, overall rates of GFR decline did not differ significantly in subjects with ARPKD vs controls. There were no significant differences in rates of HTN or left ventricular hypertrophy, but subjects with ARPKD had a greater percent on ≥ 3 blood pressure medications (32% vs 0%, P < .0001), more angiotensin-converting enzyme inhibitor use (82% vs 27% vs 36%, P < .0005), and less proteinuria (urine protein: creatinine = 0.1 vs 0.6, P < .005). CONCLUSIONS: This study reports rates of GFR decline, HTN, and proteinuria in a small but well-phenotyped ARPKD cohort. The relatively slow rate of GFR decline in subjects with ARPKD and absence of significant proteinuria suggest that these standard clinical measures may have limited utility in assessing therapeutic interventions and highlight the need for other ARPKD kidney disease progression biomarkers.
Assuntos
Rim Policístico Autossômico Recessivo/diagnóstico , Rim Policístico Autossômico Recessivo/fisiopatologia , Adolescente , Inibidores da Enzima Conversora de Angiotensina/uso terapêutico , Anti-Hipertensivos/química , Biomarcadores/metabolismo , Pressão Sanguínea , Criança , Pré-Escolar , Progressão da Doença , Feminino , Taxa de Filtração Glomerular , Humanos , Hipertensão/complicações , Hipertensão/diagnóstico , Hipertensão/fisiopatologia , Lactente , Nefropatias/diagnóstico , Nefropatias/fisiopatologia , Estudos Longitudinais , Masculino , Fenótipo , Estudos Prospectivos , Proteinúria/complicações , Proteinúria/diagnósticoRESUMO
BACKGROUND: Neurocognitive dysfunction is a known complication in children with chronic kidney disease (CKD). However, less is known about putative mechanisms or modifiable risk factors. The objective of this study was to characterize and determine risk factors for cognitive dysfunction in children, adolescents, and young adults with CKD compared with controls. STUDY DESIGN: Cross-sectional study. SETTING & PARTICIPANTS: The Neurocognitive Assessment and Magnetic Resonance Imaging Analysis of Children and Young Adults With Chronic Kidney Disease (NiCK) Study included 90 individuals aged 8 to 25 years with CKD compared with 70 controls. PREDICTORS: CKD versus control, estimated glomerular filtration rate (eGFR), ambulatory blood pressure. OUTCOMES: Performance on neurocognitive assessment with relevant tests grouped into 11 domains defined a priori by expert opinion. Results of tests were converted to age-normalized z scores. MEASUREMENTS: Each neurocognitive domain was analyzed through linear regression, adjusting for eGFR and demographic and clinical variables. For domains defined by multiple tests, the median z score of tests in that domain was used. RESULTS: We found significantly poorer performance in multiple areas of neurocognitive function among individuals with CKD compared with controls. Particular deficits were seen in domains related to attention, memory, and inhibitory control. Adjusted for demographic and clinical factors, we found lower performance in multiple domains with decreasing eGFRs (attention: ß=0.053, P=0.02; visual spatial: ß=0.062, P=0.02; and visual working memory: ß=0.069, P=0.04). Increased diastolic load and decreased diastolic nocturnal dipping on ambulatory blood pressure monitoring were independently associated with impairments in neurocognitive performance. LIMITATIONS: Unable to assess changes in neurocognitive function over time, and neurocognitive tests were grouped into predetermined neurocognitive domains. CONCLUSIONS: Lower eGFR in children, adolescents, and young adults is associated with poorer neurocognitive performance, particularly in areas of attention, memory, and inhibitory control. Hypertension identified on ambulatory blood pressure monitoring may be an important risk factor, illustrating that neurocognitive function is an area of target-organ damage in CKD.