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IgA vasculitis nephritis clinical course and kidney biopsy - national study in children

The aim of the study was to investigate the relationship between the severity of typical clinical symptoms, severity of histopathological lesions in kidney biopsies in IgA vasculitis nephritis (IgAVN) and to propose indications for kidney biopsy in children. This retrospective study enrolled 106 pat...

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Published in:Pediatric Rheumatology 2021-10, Vol.19 (1), p.150-150, Article 150
Main Authors: Mizerska-Wasiak, Małgorzata, Turczyn, Agnieszka, Cichoń-Kawa, Karolina, Małdyk, Jadwiga, Miklaszewska, Monika, Drożdż, Dorota, Bieniaś, Beata, Sikora, Przemysław, Drożyńska-Duklas, Magdalena, Żurowska, Aleksandra, Szczepańska, Maria, Pańczyk-Tomaszewska, Małgorzata
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container_title Pediatric Rheumatology
container_volume 19
creator Mizerska-Wasiak, Małgorzata
Turczyn, Agnieszka
Cichoń-Kawa, Karolina
Małdyk, Jadwiga
Miklaszewska, Monika
Drożdż, Dorota
Bieniaś, Beata
Sikora, Przemysław
Drożyńska-Duklas, Magdalena
Żurowska, Aleksandra
Szczepańska, Maria
Pańczyk-Tomaszewska, Małgorzata
description The aim of the study was to investigate the relationship between the severity of typical clinical symptoms, severity of histopathological lesions in kidney biopsies in IgA vasculitis nephritis (IgAVN) and to propose indications for kidney biopsy in children. This retrospective study enrolled 106 patients, included in the IgAVN registry of Polish children, diagnosed by kidney biopsy. Renal and extrarenal symptoms at onset of the disease were analyzed. Biopsy results were assessed using Oxford classifications (MEST-C). The patients were divided into 3 groups depending on the severity of proteinuria: A-nephrotic proteinuria with hematuria; B-non-nephrotic proteinuria with hematuria; C-isolated hematuria. The first symptoms of nephropathy were observed at the 0.7 (1-128.4) months from the onset of extrarenal symptoms. Kidney biopsy was performed on 39 (6-782) days after the onset of nephropathy symptoms. MEST-C score 4 or 5 was significantly more frequent in children from group A than in groups B and C. Significantly higher mean MEST-C score was found in patients with abdominal symptoms than without. In group A: S0 and T0 we found in significantly shorter time to kidney biopsy than in S1, T1-2 p 
doi_str_mv 10.1186/s12969-021-00616-z
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This retrospective study enrolled 106 patients, included in the IgAVN registry of Polish children, diagnosed by kidney biopsy. Renal and extrarenal symptoms at onset of the disease were analyzed. Biopsy results were assessed using Oxford classifications (MEST-C). The patients were divided into 3 groups depending on the severity of proteinuria: A-nephrotic proteinuria with hematuria; B-non-nephrotic proteinuria with hematuria; C-isolated hematuria. The first symptoms of nephropathy were observed at the 0.7 (1-128.4) months from the onset of extrarenal symptoms. Kidney biopsy was performed on 39 (6-782) days after the onset of nephropathy symptoms. MEST-C score 4 or 5 was significantly more frequent in children from group A than in groups B and C. Significantly higher mean MEST-C score was found in patients with abdominal symptoms than without. In group A: S0 and T0 we found in significantly shorter time to kidney biopsy than in S1, T1-2 p &lt; 0.05) and in group B the significantly shorter time in T0 compare to T1-2 p &lt; 0.05). The ROC analysis shows that S1 changes appear in kidney biopsies in group A with cut off 21 days (AUC 0,702, p = 0.004, sensitivity 0.895 specificity 0.444) T1-2 changes after 35 days (AUC 0.685, p = 0.022, sensitivity 0.750, specificity 0.615), and in goupn B T1-2 cut off is 74 days (AUC 0,738, p = 0.002, sensitivity 0.667, specificity 0.833). In childhood IgAVN, the severity of changes in the urine is clearly reflected in the result of a kidney biopsy. The biopsy should be performed in patients with nephrotic proteinuria no later than 3 weeks after the onset of this symptom in order to promptly apply appropriate treatment and prevent disease progression. 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This retrospective study enrolled 106 patients, included in the IgAVN registry of Polish children, diagnosed by kidney biopsy. Renal and extrarenal symptoms at onset of the disease were analyzed. Biopsy results were assessed using Oxford classifications (MEST-C). The patients were divided into 3 groups depending on the severity of proteinuria: A-nephrotic proteinuria with hematuria; B-non-nephrotic proteinuria with hematuria; C-isolated hematuria. The first symptoms of nephropathy were observed at the 0.7 (1-128.4) months from the onset of extrarenal symptoms. Kidney biopsy was performed on 39 (6-782) days after the onset of nephropathy symptoms. MEST-C score 4 or 5 was significantly more frequent in children from group A than in groups B and C. Significantly higher mean MEST-C score was found in patients with abdominal symptoms than without. In group A: S0 and T0 we found in significantly shorter time to kidney biopsy than in S1, T1-2 p &lt; 0.05) and in group B the significantly shorter time in T0 compare to T1-2 p &lt; 0.05). The ROC analysis shows that S1 changes appear in kidney biopsies in group A with cut off 21 days (AUC 0,702, p = 0.004, sensitivity 0.895 specificity 0.444) T1-2 changes after 35 days (AUC 0.685, p = 0.022, sensitivity 0.750, specificity 0.615), and in goupn B T1-2 cut off is 74 days (AUC 0,738, p = 0.002, sensitivity 0.667, specificity 0.833). In childhood IgAVN, the severity of changes in the urine is clearly reflected in the result of a kidney biopsy. The biopsy should be performed in patients with nephrotic proteinuria no later than 3 weeks after the onset of this symptom in order to promptly apply appropriate treatment and prevent disease progression. Accompanying abdominal symptoms predispose to higher MESTC score.</abstract><cop>England</cop><pub>BioMed Central Ltd</pub><pmid>34620183</pmid><doi>10.1186/s12969-021-00616-z</doi><tpages>1</tpages><orcidid>https://orcid.org/0000-0003-0063-8699</orcidid><oa>free_for_read</oa></addata></record>
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1546-0096
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source Publicly Available Content Database; PubMed Central
subjects Abdomen
Adolescent
Age
Antibodies
Biopsy
Biopsy - methods
Child
Child, Preschool
Children
Clinical trials
Creatinine
Development and progression
Disease Progression
Female
Follow-Up Studies
Hematuria
Henoch-Schönlein purpura and other vasculitides
Humans
Hypertension
IgA Vasculitis - diagnosis
IgA Vasculitis - epidemiology
Immunoglobulin A
Immunologic subjects
Kidney - pathology
Male
Medical research
Medicine, Experimental
Nephritis
Nephritis - diagnosis
Nephritis - epidemiology
Pain
Pediatrics
Poland - epidemiology
Population Surveillance
Registries
Retrospective Studies
ROC Curve
Severity of Illness Index
Vasculitis
title IgA vasculitis nephritis clinical course and kidney biopsy - national study in children
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