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Abstract
PURPOSE OF REVIEW The current review will describe the current evidence and mechanisms of acute kidney injury (AKI) as a risk factor for long-term kidney complications, summarize the rationale for AKI follow-up and present an approach to monitoring children with AKI. Despite emerging evidence linking AKI with risk for long-term kidney and cardiovascular outcomes, many children who develop AKI are not followed for kidney disease development after hospital discharge. Better understanding of long-term complications after AKI and practical algorithms for follow-up will hopefully increase the rate and quality of post-AKI monitoring. RECENT FINDINGS Recent evidence shows that pediatric AKI is associated with long-term renal outcomes such as chronic kidney disease (CKD) and hypertension, both known to increase cardiovascular risk. The mechanism of AKI progression to CKD involves maladaptive regeneration of tubular epithelial and endothelial cells, inflammation, fibrosis and glomerulosclerosis. Many AKI survivors are not followed, and no guidelines for pediatric AKI follow-up have been published. SUMMARY Children who had AKI are at increased risk of long-term renal complications but many of them are not monitored for these complications. Recognizing long-term outcomes post-AKI and integration of follow-up programs may have a long-lasting positive impact on patient health.
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Joseph A, Cointe A, Mariani Kurkdjian P, Rafat C, Hertig A. Shiga Toxin-Associated Hemolytic Uremic Syndrome: A Narrative Review. Toxins (Basel) 2020; 12:E67. [PMID: 31973203 PMCID: PMC7076748 DOI: 10.3390/toxins12020067] [Citation(s) in RCA: 100] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 01/13/2020] [Accepted: 01/17/2020] [Indexed: 01/28/2023] Open
Abstract
The severity of human infection by one of the many Shiga toxin-producing Escherichia coli (STEC) is determined by a number of factors: the bacterial genome, the capacity of human societies to prevent foodborne epidemics, the medical condition of infected patients (in particular their hydration status, often compromised by severe diarrhea), and by our capacity to devise new therapeutic approaches, most specifically to combat the bacterial virulence factors, as opposed to our current strategies that essentially aim to palliate organ deficiencies. The last major outbreak in 2011 in Germany, which killed more than 50 people in Europe, was evidence that an effective treatment was still lacking. Herein, we review the current knowledge of STEC virulence, how societies organize the prevention of human disease, and how physicians treat (and, hopefully, will treat) its potentially fatal complications. In particular, we focus on STEC-induced hemolytic and uremic syndrome (HUS), where the intrusion of toxins inside endothelial cells results in massive cell death, activation of the coagulation within capillaries, and eventually organ failure.
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Affiliation(s)
- Adrien Joseph
- Department of Nephrology, AP-HP, Hôpital Tenon, F-75020 Paris, France; (A.J.); (C.R.)
| | - Aurélie Cointe
- Department of Microbiology, AP-HP, Hôpital Robert Debré, F-75019 Paris, France; (A.C.); (P.M.K.)
| | | | - Cédric Rafat
- Department of Nephrology, AP-HP, Hôpital Tenon, F-75020 Paris, France; (A.J.); (C.R.)
| | - Alexandre Hertig
- Department of Renal Transplantation, Sorbonne Université, AP-HP, Hôpital Pitié Salpêtrière, F-75013 Paris, France
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3
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Monet-Didailler C, Godron-Dubrasquet A, Madden I, Delmas Y, Llanas B, Harambat J. Long-term outcome of diarrhea-associated hemolytic uremic syndrome is poorly related to markers of kidney injury at 1-year follow-up in a population-based cohort. Pediatr Nephrol 2019; 34:657-662. [PMID: 30368614 DOI: 10.1007/s00467-018-4131-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 10/07/2018] [Accepted: 10/22/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND Hemolytic uremic syndrome due to Shiga toxin-producing E. coli (STEC-HUS) is the main cause of acute kidney injury in young children. Most fully recover kidney function; however, some develop long-term sequelae. We aimed to determine whether kidney injury 1 year after HUS onset is associated with long-term kidney outcome in pediatric STEC-HUS. METHODS A retrospective population-based study of children < 15 years with STEC-HUS between 1992 and 2012 was performed. Mixed effects logistic regression was used to investigate associations between kidney injury at 1 year and long-term kidney outcome. RESULTS Ninety-eight STEC-HUS cases were reported. Of 96 patients who survived acute phase, 84 were evaluated at 1-year follow-up of whom 42 (44% of survivors) showed ≥ 1 signs of kidney injury. Data from 81 patients were collected after median follow-up of 8.7 (IQR 3.5-12.7) years. At last follow-up, 42 (44% of survivors) had ≥ 1 signs of kidney injury including decreased estimated glomerular filtration rate (eGFR) < 90 mL/min/1.73 m2 (n = 30), proteinuria (n = 17), or hypertension (n = 5). Among 42 patients with kidney injuries at 1-year follow-up, only 22 (52%) still had kidney disease at last follow-up. Conversely, of 33 patients without kidney injury at 1-year and available long-term outcome data, 11 (33%) had proteinuria or decreased GFR at last follow-up. There was no statistically significant association between kidney injury at 1 year and long-term kidney outcome. CONCLUSIONS Since kidney sequelae may appear at variable time intervals after acute HUS, all patients need lifelong follow-up to detect early signs of chronic kidney disease and propose measures to slow progression.
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Affiliation(s)
- Catherine Monet-Didailler
- Service de Pédiatrie, Centre de référence Maladies Rénales Rares du Sud-ouest (SoRare), CHU de Bordeaux, Bordeaux, France
| | - Astrid Godron-Dubrasquet
- Service de Pédiatrie, Centre de référence Maladies Rénales Rares du Sud-ouest (SoRare), CHU de Bordeaux, Bordeaux, France
| | - Iona Madden
- Service de Pédiatrie, Centre de référence Maladies Rénales Rares du Sud-ouest (SoRare), CHU de Bordeaux, Bordeaux, France
| | - Yahsou Delmas
- Service de Néphrologie, Centre de référence Maladies Rénales Rares du Sud-ouest (SoRare), CHU de Bordeaux, Bordeaux, France
| | - Brigitte Llanas
- Service de Pédiatrie, Centre de référence Maladies Rénales Rares du Sud-ouest (SoRare), CHU de Bordeaux, Bordeaux, France
| | - Jérôme Harambat
- Service de Pédiatrie, Centre de référence Maladies Rénales Rares du Sud-ouest (SoRare), CHU de Bordeaux, Bordeaux, France. .,Inserm, Bordeaux Population Health Research Center, UMR 1219, Université de Bordeaux, Bordeaux, France.
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Larkins NG, Teixeira-Pinto A, Craig JC. A narrative review of proteinuria and albuminuria as clinical biomarkers in children. J Paediatr Child Health 2019; 55:136-142. [PMID: 30414234 DOI: 10.1111/jpc.14293] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 10/01/2018] [Accepted: 10/09/2018] [Indexed: 11/28/2022]
Abstract
Proteinuria is an important biomarker commonly used to detect and manage kidney disease in children. There are now a variety of methods available to measure urinary protein loss, and physicians are faced with several contrasting strategies: 24-h or timed collection versus spot samples (first-morning or random), measurement of total urinary protein versus selective measurement of urinary albumin, unadjusted urine protein concentration versus protein-to-creatinine ratio and the use of dipstick versus laboratory-based methods. In this review, we will discuss the advantages and disadvantages of these different approaches. We will then summarise the evidence base for proteinuria as a clinical biomarker in different settings, including discussion of the current and potential role of measuring low-level albuminuria. Finally, we will highlight gaps in the literature and opportunities for further research into proteinuria among children.
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Affiliation(s)
- Nicholas G Larkins
- School of Public Health, University of Sydney, Sydney, New South Wales, Australia.,Centre for Kidney Research, Kids Research Institute, Sydney, New South Wales, Australia.,Department of Nephrology, Perth Children's Hospital, Perth, Western Australia, Australia
| | - Armando Teixeira-Pinto
- School of Public Health, University of Sydney, Sydney, New South Wales, Australia.,Centre for Kidney Research, Kids Research Institute, Sydney, New South Wales, Australia
| | - Jonathan C Craig
- School of Public Health, University of Sydney, Sydney, New South Wales, Australia.,Centre for Kidney Research, Kids Research Institute, Sydney, New South Wales, Australia
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Sigurjonsdottir VK, Chaturvedi S, Mammen C, Sutherland SM. Pediatric acute kidney injury and the subsequent risk for chronic kidney disease: is there cause for alarm? Pediatr Nephrol 2018; 33:2047-2055. [PMID: 29374316 DOI: 10.1007/s00467-017-3870-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 12/03/2017] [Accepted: 12/04/2017] [Indexed: 02/02/2023]
Abstract
Acute kidney injury (AKI) is characterized clinically as an abrupt decline in renal function marked by reduced excretion of waste products, disordered electrolytes, and disrupted fluid homeostasis. The recent development of a standardized AKI definition has transformed our understanding of AKI epidemiology and outcomes. We now know that in the short term, children with AKI experience greater morbidity and mortality; additionally, observational studies have established that chronic renal sequelae are far more common after AKI events than previously realized. Many of these studies suggest that patients who develop AKI are at greater risk for the subsequent development of chronic kidney disease (CKD). The goal of this review is to critically evaluate the data regarding the association between AKI and CKD in children. Additionally, we describe best practice approaches for future studies, including the use of consensus AKI criteria, the application of rigorous definitions for CKD and renal sequelae, and the inclusion of non-AKI comparator groups. Finally, based upon existing data, we suggest an archetypal approach to follow-up care for the AKI survivors who may be at greater CKD risk, including children with more severe AKI, those who endure repeated AKI episodes, patients who do not experience full recovery, and those with pre-existing CKD.
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Affiliation(s)
- Vaka K Sigurjonsdottir
- Department of Pediatrics, Division of Nephrology, Stanford University School of Medicine, 300 Pasteur Drive, Room G-306, Stanford, CA, USA
| | | | - Cherry Mammen
- Division of Paediatric Nephrology, Department of Paediatrics, British Columbia Children's Hospital, Vancouver, BC, Canada
| | - Scott M Sutherland
- Department of Pediatrics, Division of Nephrology, Stanford University School of Medicine, 300 Pasteur Drive, Room G-306, Stanford, CA, USA.
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Saydah SH, Xie H, Imperatore G, Burrows NR, Pavkov ME. Trends in Albuminuria and GFR Among Adolescents in the United States, 1988-2014. Am J Kidney Dis 2018; 72:644-652. [PMID: 30017204 DOI: 10.1053/j.ajkd.2018.04.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 04/19/2018] [Indexed: 11/11/2022]
Abstract
RATIONALE & OBJECTIVE Albuminuria and low estimated glomerular filtration rate (eGFR) define chronic kidney disease in adults and youth. Different from adults, the burden of abnormal kidney markers among youth in the general United States population is largely unknown. STUDY DESIGN Serial cross-sectional national surveys. SETTING & PARTICIPANTS Adolescents aged 12 to 18 years participating in the National Health and Nutrition Examination Surveys 1988 to 2014. Surveys were grouped into three 6-year periods. PREDICTORS Demographic and clinical determinants of kidney markers. OUTCOME Prevalence and trends in persistent albuminuria, low (< 60mL/min/1.73m2) and reduced (< 90mL/min/1.73m2) eGFRs. ANALYTICAL APPROACH Outcomes defined as persistent albumin-creatinine ratio ≥ 30mg/g (persistent albuminuria), eGFR < 90mL/min/1.73m2 (reduced kidney function), and eGFR < 60mL/min/1.73m2 (low kidney function). Multiple imputation analysis was used to estimate missing follow-up values of albuminuria. RESULTS Prevalences of persistent albuminuria were 3.64% (95% CI, 1.82%-5.46%) in 1988-1994 and 3.29% (95% CI, 1.94%-4.63%) in 2009-2014 (adjusted prevalence ratio, 0.93; 95% CI, 0.53-1.62; P=0.8 for trend). Prevalences of reduced eGFR were 31.46% (95% CI, 28.42%-34.67%) and 34.58% (95% CI, 32.07%-37.18%), respectively (adjusted prevalence ratio, 1.21; 95% CI, 1.00-1.46; P < 0.001 for trend). Prevalences of low eGFR were 0.32% (95% CI, 0.12%-0.84%) in 1988-1994 and 0.91% (95% CI, 0.58%-1.42%) in 2009-2014 (adjusted prevalence ratio, 3.10; 95% CI, 1.10-9.01; P = 0.09 for trend). Prevalences of albuminuria and/or low eGFR remained at 4.0% in 1988-1994 and 2009-2014 (adjusted prevalence ratio, 1.06; 95% CI, 0.64-1.77; P = 0.8 for trend). LIMITATIONS Persistent albuminuria data were based on imputed values (for second assessment of albuminuria) in 91% of participants; lack of second eGFR assessment to confirm sustained reduction in kidney function. CONCLUSIONS Albuminuria prevalence has not changed significantly in the US adolescent population between 1988 and 2014. Prevalences of both reduced and low eGFRs were higher in the most recent study period; however, < 1% of adolescents had low eGFRs.
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Affiliation(s)
- Sharon H Saydah
- Division of Diabetes Translation, Centers for Disease Control and Prevention, Atlanta, GA
| | - Hui Xie
- Division of Diabetes Translation, Centers for Disease Control and Prevention, Atlanta, GA
| | - Giuseppina Imperatore
- Division of Diabetes Translation, Centers for Disease Control and Prevention, Atlanta, GA
| | - Nilka Ríos Burrows
- Division of Diabetes Translation, Centers for Disease Control and Prevention, Atlanta, GA
| | - Meda E Pavkov
- Division of Diabetes Translation, Centers for Disease Control and Prevention, Atlanta, GA.
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Sierra-Diaz E, Celis-de la Rosa ADJ, Lozano-Kasten F, Bravo-Cuellar A, Garcia-Gutierrez M, Georgina HF. Non-Traditional Risk Factors of Albuminuria in the Pediatric Population: A Scoping Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2017; 14:ijerph14101231. [PMID: 29035316 PMCID: PMC5664732 DOI: 10.3390/ijerph14101231] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Revised: 10/11/2017] [Accepted: 10/11/2017] [Indexed: 12/27/2022]
Abstract
The presence of albumin in urine has been used for more than four decades as a marker of renal and cardiovascular damage. Most of the information on this marker is related to adults. The prevalence of albuminuria in the pediatric population has been reported as being 2.2–12.8% in some countries. Most research in this field is related to albuminuria and diseases, such as diabetes and hypertension. Using the methodology described by Arksey and O’Malley in 2005, a scoping review was carried out to show that the presence of albumin in urine in the pediatric population might be associated with environmental, demographic, congenital, infectious, and non-infectious factors. The information collected is supported by 74 references present in PubMed. The results reveal the multiple causes associated with albuminuria in the pediatric population. This information can be very useful for clinical practice by adding knowledge about albuminuria behavior in children.
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Affiliation(s)
- Erick Sierra-Diaz
- Public Health Department, University of Guadalajara, Sierra Mojada 950, Colonia Independencia, Guadalajara, Jalisco 44340, Mexico.
| | | | - Felipe Lozano-Kasten
- Environmental Health Department, University of Guadalajara, Sierra Mojada 950, Colonia Independencia, Guadalajara, Jalisco 44340, Mexico.
| | - Alejandro Bravo-Cuellar
- Immunology Department, Western Research Biomedical Center (IMSS), Sierra Mojada 800, Colonia Independencia, Guadalajara, Jalisco 44340, Mexico.
| | - Mariana Garcia-Gutierrez
- Pediatrics Department, Hospital Angeles del Carmen, Health Services, Tarascos 3473 Interior 240A, Fraccionamiento Monraz, Guadalajara, Jalisco 44670, Mexico.
| | - Hernandez-Flores Georgina
- Immunology Department, Western Research Biomedical Center (IMSS), Sierra Mojada 800, Colonia Independencia, Guadalajara, Jalisco 44340, Mexico.
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8
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Acute kidney injury is a risk factor for subsequent proteinuria. Kidney Int 2017; 93:460-469. [PMID: 28927644 DOI: 10.1016/j.kint.2017.07.007] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 06/20/2017] [Accepted: 07/13/2017] [Indexed: 12/31/2022]
Abstract
Acute kidney injury (AKI) is associated with subsequent chronic kidney disease (CKD), but the mechanism is unclear. To clarify this, we examined the association of AKI and new-onset or worsening proteinuria during the 12 months following hospitalization in a national retrospective cohort of United States Veterans hospitalized between 2004-2012. Patients with and without AKI were matched using baseline demographics, comorbidities, proteinuria, estimated glomerular filtration rate, blood pressure, angiotensin-converting enzyme inhibitor or angiotensin II receptor blocker (ACEI/ARB) use, and inpatient exposures linked to AKI. The distribution of proteinuria over one year post-discharge in the matched cohort was compared using inverse probability sampling weights. Subgroup analyses were based on diabetes, pre-admission ACEI/ARB use, and AKI severity. Among the 90,614 matched AKI and non-AKI pairs, the median estimated glomerular filtration rate was 62 mL/min/1.73m2. The prevalence of diabetes and hypertension were 48% and 78%, respectively. The odds of having one plus or greater dipstick proteinuria was significantly higher during each month of follow-up in patients with AKI than in patients without AKI (odds ratio range 1.20-1.39). Odds were higher in patients with Stage II or III AKI (odds ratios 1.32-1.81) than in Stage I AKI (odds ratios 1.18-1.32), using non-AKI as the reference group. Results were consistent regardless of diabetes status or baseline ACEI/ARB use. Thus, AKI is a risk factor for incident or worsening proteinuria, suggesting a possible mechanism linking AKI and future CKD. The type of proteinuria, physiology, and clinical significance warrant further study as a potentially modifiable risk factor in the pathway from AKI to CKD.
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Patel SS, Palant CE, Mahajan V, Chawla LS. Sequelae of AKI. Best Pract Res Clin Anaesthesiol 2017; 31:415-425. [PMID: 29248147 DOI: 10.1016/j.bpa.2017.08.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 08/17/2017] [Indexed: 12/28/2022]
Abstract
Large epidemiologic studies in a variety of patient populations reveal increased morbidity and mortality that occur months to years after an episode of acute kidney injury (AKI). Even milder forms of AKI have increased associated morbidity and mortality. Residual confounding may account for these findings, but considering the huge number of individuals afflicted with AKI, the sequelae of AKI may be a very large public health burden. AKI may simply be a marker for increased risk, but there is increasing evidence that it is part of the causal pathway to chronic kidney disease. These studies have upended the traditional view that AKI survivors who returned to baseline, or near baseline renal function, do not suffer additional long-term consequences. Recovery of renal function after AKI, short of independence from renal replacement therapy, is yet to be clearly defined but may be of significant importance in the management of AKI survivors. The association between AKI in patients who undergo cardiac surgery and clinical outcomes is of considerable importance to clinicians, surgeons, and anesthesiologists alike and is a major focus of this review.
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Affiliation(s)
- Samir S Patel
- The Veterans Affairs Medical Center, Washington, DC, USA; George Washington University Medical Center, Washington, DC, USA
| | - Carlos E Palant
- The Veterans Affairs Medical Center, Washington, DC, USA; George Washington University Medical Center, Washington, DC, USA
| | - Vrinda Mahajan
- Georgetown University Medical Center, Washington, DC, USA
| | - Lakhmir S Chawla
- The Veterans Affairs Medical Center, Washington, DC, USA; George Washington University Medical Center, Washington, DC, USA
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Kreuzer M, Sollmann L, Ruben S, Leifheit-Nestler M, Fischer DC, Pape L, Haffner D. Endothelial dysfunction during long-term follow-up in children with STEC hemolytic-uremic syndrome. Pediatr Nephrol 2017; 32:1005-1011. [PMID: 28180952 DOI: 10.1007/s00467-016-3574-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 12/16/2016] [Accepted: 12/20/2016] [Indexed: 11/25/2022]
Abstract
BACKGROUND Shiga-toxin-producing Escherichia coli (STEC)-associated hemolytic-uremic syndrome (HUS) is a major cause of acute kidney injury (AKI), especially in children. Its long-term outcome with respect to endothelial damage remains largely elusive. METHODS This was a cross-sectional study in 26 children who had suffered from STEC-HUS in the past and achieved a complete recovery of renal function (eGFR >90 ml/min/1.73 m2). Skin microcirculation after local heating was assessed by laser Doppler fluximetry, carotid-femoral pulse wave velocity (PWV), carotid intima media thickness (cIMT), 24-h ambulatory blood pressure, and angiopoietin (Ang) 1 and 2 serum levels after a median follow-up period of 6.1 years. The results were compared to those of healthy controls. RESULTS All patients were normotensive, mean eGFR was 102 (range 91-154) ml/min/1.73 m2, and 13 of the 26 patients showed albuminuria. Endothelial dysfunction was present in 13 patients, and the mean serum Ang2/Ang1 ratio was increased compared to healthy children (each p < 0.05). In contrast, mean values for PWV and cIMT in the patients did not differ from those of the controls. Endothelial dysfunction was significantly associated with younger age at STEC-HUS manifestation, time after HUS, and presence of albuminuria. CONCLUSION The results of this study highlight the need for long-term follow-up of STEC-HUS patients even after complete recovery of eGFR and lack of hypertension with respect to microvascular damage.
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Affiliation(s)
- Martin Kreuzer
- Department of Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625, Hannover, Germany.
| | - Laura Sollmann
- Department of Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625, Hannover, Germany
| | - Stephan Ruben
- Department of Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625, Hannover, Germany
| | - Maren Leifheit-Nestler
- Department of Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625, Hannover, Germany
| | | | - Lars Pape
- Department of Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625, Hannover, Germany
| | - Dieter Haffner
- Department of Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625, Hannover, Germany
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Abstract
Post-infectious hemolytic uremic syndrome (HUS) is caused by specific pathogens in patients with no identifiable HUS-associated genetic mutation or autoantibody. The majority of episodes is due to infections by Shiga toxin (Stx) producing Escherichia coli (STEC). This chapter reviews the epidemiology and pathogenesis of STEC-HUS, including bacterial-derived factors and host responses. STEC disease is characterized by hematological (microangiopathic hemolytic anemia), renal (acute kidney injury) and extrarenal organ involvement. Clinicians should always strive for an etiological diagnosis through the microbiological or molecular identification of Stx-producing bacteria and Stx or, if negative, serological assays. Treatment of STEC-HUS is supportive; more investigations are needed to evaluate the efficacy of putative preventive and therapeutic measures, such as non-phage-inducing antibiotics, volume expansion and anti-complement agents. The outcome of STEC-HUS is generally favorable, but chronic kidney disease, permanent extrarenal, mainly cerebral complication and death (in less than 5 %) occur and long-term follow-up is recommended. The remainder of this chapter highlights rarer forms of (post-infectious) HUS due to S. dysenteriae, S. pneumoniae, influenza A and HIV and discusses potential interactions between these pathogens and the complement system.
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Affiliation(s)
- Denis F. Geary
- Division of Nephrology, The Hospital for Sick Children, Toronto, Ontario Canada
| | - Franz Schaefer
- Division of Pediatric Nephrology, University of Heidelberg, Heidelberg, Germany
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12
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Filler G, Huang SHS, Lindsay RM. The Search for More Reliable Estimated GFR Biomarkers. Am J Kidney Dis 2016; 67:5-8. [PMID: 26708192 DOI: 10.1053/j.ajkd.2015.10.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 10/08/2015] [Indexed: 12/13/2022]
Affiliation(s)
- Guido Filler
- Western University and London Health Sciences Centre, London, Canada; Western University, London, Canada.
| | - Shih-Han S Huang
- Western University and London Health Sciences Centre, London, Canada; Western University, London, Canada
| | - Robert M Lindsay
- Western University and London Health Sciences Centre, London, Canada; Western University, London, Canada
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Parr SK, Siew ED. Delayed Consequences of Acute Kidney Injury. Adv Chronic Kidney Dis 2016; 23:186-94. [PMID: 27113695 PMCID: PMC4849427 DOI: 10.1053/j.ackd.2016.01.014] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Accepted: 01/22/2016] [Indexed: 11/11/2022]
Abstract
Acute kidney injury (AKI) is an increasingly common complication of hospitalization and acute illness. Experimental data indicate that AKI may cause permanent kidney damage through tubulointerstitial fibrosis and progressive nephron loss, while also lowering the threshold for subsequent injury. Furthermore, preclinical data suggest that AKI may also cause distant organ dysfunction. The extension of these findings to human studies suggests long-term consequences of AKI including, but not limited to recurrent AKI, progressive kidney disease, elevated blood pressure, cardiovascular events, and mortality. As the number of AKI survivors increases, the need to better understand the mechanisms driving these processes becomes paramount. Optimizing care for AKI survivors will require understanding the short- and long-term risks associated with AKI, identifying patients at highest risk for poor outcomes, and testing interventions that target modifiable risk factors. In this review, we examine the literature describing the association between AKI and long-term outcomes and highlight opportunities for further research and potential intervention.
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Affiliation(s)
- Sharidan K Parr
- Tennessee Valley Healthcare System (TVHS), Geriatric Research Education and Clinical Centers (GRECC), Nashville, TN; TVHS, Veterans Administration (VA) Medical Center, Veterans Health Administration, Nashville, TN; Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN; and Vanderbilt Center for Kidney Disease (VCKD), Nashville, TN
| | - Edward D Siew
- Tennessee Valley Healthcare System (TVHS), Geriatric Research Education and Clinical Centers (GRECC), Nashville, TN; TVHS, Veterans Administration (VA) Medical Center, Veterans Health Administration, Nashville, TN; Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN; and Vanderbilt Center for Kidney Disease (VCKD), Nashville, TN.
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14
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Three supplementary methods for analyzing cytotoxicity of Escherichia coli O157:H7. J Microbiol Methods 2016; 120:34-40. [DOI: 10.1016/j.mimet.2015.11.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 11/13/2015] [Accepted: 11/14/2015] [Indexed: 11/19/2022]
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16
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Cubillos C MP, Del Salas P, Zambrano PO. [Microalbuminuria in pediatric patients diagnosed with hemolytic uremic syndrome]. REVISTA CHILENA DE PEDIATRIA 2015; 86:92-6. [PMID: 26235688 DOI: 10.1016/j.rchipe.2015.04.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 01/13/2015] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Hemolytic uremic syndrome (HUS) is characterized by the presence of microangiopathic hemolytic anemia, thrombocytopenia, and acute kidney failure. It is the leading cause of acute kidney failure in children under 3 years of age. A variable number of patients develop proteinuria, hypertension, and chronic renal failure. OBJECTIVE To evaluate the renal involvement in pediatric patients diagnosed with HUS using the microalbumin/creatinine ratio. PATIENTS AND METHODS Descriptive concurrent cohort study that analyzed the presence of microalbuminuria in patients diagnosed with HUS between January 2001 and March 2012, who evolved without hypertension and normal renal function (clearance greater than 90ml/min using Schwartz formula). Demographic factors (age, sex), clinical presentation at time of diagnosis, use of antibiotics prior to admission, and need for renal replacement therapy were evaluated. RESULTS Of the 24 patients studied, 54% were male. The mean age at diagnosis was two years. Peritoneal dialysis was required in 45%, and 33% developed persistent microalbuminuria. Antiproteinuric treatment was introduce in 4 patients, with good response. The mean follow-up was 6 years (range 6 months to 11 years). The serum creatinine returned to normal in all patients during follow up. CONCLUSIONS The percentage of persistent microalbuminuria found in patients with a previous diagnosis of HUS was similar in our group to that described in the literature. Antiproteinuric treatment could delay kidney damage, but further multicenter prospective studies are necessary.
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Affiliation(s)
- María Paz Cubillos C
- Becaria de Pediatría, Universidad de Chile, Campus Sur, Santiago de Chile, Chile.
| | - Paulina Del Salas
- Unidad de Nefrología Pediátrica, Hospital de niños Exequiel González Cortés, Santiago de Chile, Chile
| | - Pedro O Zambrano
- Unidad de Nefrología Pediátrica, Hospital de niños Exequiel González Cortés, Santiago de Chile, Chile; Unidad de Nefrología Pediátrica, División de Pediatría, Pontificia Universidad Católica de Chile, Santiago de Chile, Chile
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Tanaka S, Tanaka T, Nangaku M. Hypoxia as a key player in the AKI-to-CKD transition. Am J Physiol Renal Physiol 2014; 307:F1187-95. [PMID: 25350978 DOI: 10.1152/ajprenal.00425.2014] [Citation(s) in RCA: 189] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Recent clinical and animal studies have shown that acute kidney injury (AKI), even if followed by complete recovery of renal function, can eventually result in chronic kidney disease (CKD). Renal hypoxia is emerging as a key player in the pathophysiology of the AKI-to-CKD transition. Capillary rarefaction after AKI episodes induces renal hypoxia, which can in turn profoundly affect tubular epithelial cells, (myo)fibroblasts, and inflammatory cells, culminating in tubulointerstitial fibrosis, i.e., progression to CKD. Damaged tubular epithelial cells that fail to redifferentiate might supply a decreased amount of vascular endothelial growth factor and contribute to capillary rarefaction, thus aggravating hypoxia and forming a vicious cycle. Mounting evidence also shows that epigenetic changes are closely related to renal hypoxia in the pathophysiology of CKD progression. Animal experiments suggest that targeting hypoxia is a promising strategy to block the transition from AKI to CKD. However, the precise mechanisms by which hypoxia induces the AKI-to-CKD transition and by which hypoxia-inducible factor activation can exert a protective effect in this context should be clarified in further studies.
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Affiliation(s)
- Shinji Tanaka
- Division of Nephrology and Endocrinology, The University of Tokyo Graduate School of Medicine, Tokyo, Japan
| | - Tetsuhiro Tanaka
- Division of Nephrology and Endocrinology, The University of Tokyo Graduate School of Medicine, Tokyo, Japan
| | - Masaomi Nangaku
- Division of Nephrology and Endocrinology, The University of Tokyo Graduate School of Medicine, Tokyo, Japan
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18
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Keir LS, Saleem MA. Current evidence for the role of complement in the pathogenesis of Shiga toxin haemolytic uraemic syndrome. Pediatr Nephrol 2014; 29:1895-902. [PMID: 23843163 DOI: 10.1007/s00467-013-2561-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 05/21/2013] [Accepted: 06/21/2013] [Indexed: 12/30/2022]
Abstract
Shiga toxin-associated haemolytic uraemic syndrome (Stx HUS) is the leading cause of paediatric acute kidney injury. This toxin-mediated disease carries a significant morbidity and mortality but has no direct treatments. Rare familial atypical HUS (aHUS) is now understood to result from over-activation of the alternative complement pathway causing glomerular endothelial damage. By understanding the pathogenic mechanisms of this disease, the monoclonal antibody eculizumab, which blocks the final common pathway of complement, is now being used to treat aHUS. For this reason, clinicians and scientists are studying the role of the alternative complement pathway in Stx HUS with the aim of targeting treatment in a similar way. There is some evidence suggesting that complement plays a role in the pathogenesis of Stx HUS, but other mechanisms may also be important. Clinically, modulating the complement system using plasma exchange provides no proven benefit in Stx HUS, and the use of eculizumab has provided conflicting results. Understanding the local effect of Stx on the glomerulus, in particular regulation of the complement and coagulation systems, may lead to advances in defining the precise pathogenesis of this disease. Then, targeted treatment strategies could be devised and clinical trials undertaken.
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Affiliation(s)
- Lindsay S Keir
- Academic Renal Unit, University of Bristol-Southmead Hospital, Bristol, UK,
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19
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Abstract
PURPOSE OF REVIEW It has been argued that the existing epidemiologic data are insufficient to establish a causal link between acute kidney injury (AKI) and subsequent development or progression of chronic kidney disease (CKD), especially given that risk factors for the development of AKI overlap with those for progressive CKD. RECENT FINDINGS Multiple studies published over the past 5 years have demonstrated a strong epidemiologic association between episodes of AKI and subsequent development or progression of CKD, including evidence that severity of AKI and repeated episodes of AKI are associated with increased risk of CKD. In addition, animal models have provided evidence for a biological basis linking episodes of AKI with CKD. SUMMARY The preponderance of data support a causal link between episodes of AKI and subsequent development or progression of CKD.
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Sinert R, Brandler E. Contrast-induced acute kidney injury: time for a step backward. Acad Emerg Med 2014; 21:701-3. [PMID: 25039557 DOI: 10.1111/acem.12392] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Ethan Brandler
- Department of Emergency Medicine; State University of New York; Brooklyn New York
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21
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Keithlin J, Sargeant J, Thomas MK, Fazil A. Chronic sequelae of E. coli O157: systematic review and meta-analysis of the proportion of E. coli O157 cases that develop chronic sequelae. Foodborne Pathog Dis 2014; 11:79-95. [PMID: 24404780 PMCID: PMC3925333 DOI: 10.1089/fpd.2013.1572] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
OBJECTIVE This was a systematic review and meta-analysis to determine the proportion of Escherichia coli O157 cases that develop chronic sequelae. DATA SOURCES We conducted a systematic review of articles published prior to July 2011 in Pubmed, Agricola, CabDirect, or Food Safety and Technology Abstracts. STUDY SELECTION Studies were selected that reported the number of E. coli O157 cases that developed reactive arthritis (ReA), hemolytic uremic syndrome (HUS), irritable bowel syndrome, inflammatory bowel disease, or Guillain Barré syndrome. METHODS Three levels of screening and data extraction of articles were conducted using predefined data fields. Meta-analysis was performed on unique outcome measures using a random-effects model, and heterogeneity was assessed using the I² value. Meta-regression was used to explore the influence of nine study-level variables on heterogeneity. RESULTS A total of 82 studies were identified reporting 141 different outcome measures; 81 reported on HUS and one reported on ReA. Depending on the number of cases of E. coli O157, the estimate for the proportion of E. coli O157 cases that develop HUS ranged from 17.2% in extra-small studies (<50 cases) to 4.2% in extra-large studies (>1000 cases). Heterogeneity was significantly associated with group size (p<0.0001); however, the majority of the heterogeneity was unexplained. CONCLUSIONS High unexplained heterogeneity indicated that the study-level factors examined had a minimal influence on the variation of estimates reported.
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Affiliation(s)
- Jessica Keithlin
- Centre for Public Health and Zoonoses, University of Guelph, Guelph, Ontario, Canada
- Department of Population Medicine, Ontario Veterinary College, Guelph, Ontario, Canada
| | - Jan Sargeant
- Centre for Public Health and Zoonoses, University of Guelph, Guelph, Ontario, Canada
- Department of Population Medicine, Ontario Veterinary College, Guelph, Ontario, Canada
| | - M. Kate Thomas
- Centre for Food-borne, Environmental, and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, Ontario, Canada
| | - Aamir Fazil
- Laboratory for Foodborne Zoonoses, Public Health Agency of Canada, Guelph, Ontario, Canada
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22
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Goldstein SL, Chawla L, Ronco C, Kellum JA. Renal recovery. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2014; 18:301. [PMID: 24393370 PMCID: PMC4056087 DOI: 10.1186/cc13180] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Acute kidney injury (AKI) research in the past decade has mostly focused upon development of a standard AKI definition, validation of early novel biomarkers to predict AKI prior to serum creatinine rise and predict AKI severity, and assessment of aspects of renal replacement therapies and their impact on survival. Given the independent association between AKI and mortality in the acute phase, such focus makes imminent sense. More recently, the recognition that AKI is associated with subsequent development of chronic kidney disease and end-stage renal disease, with the attendant increase in mortality, has led to interest in the clinical epidemiology and the mechanistic understanding of renal recovery after an AKI episode in critically ill patients. We review the current knowledge surrounding renal recovery after an AKI episode, including renal replacement therapy initiation timing and modality impact, biomarker assessment and mechanistic targets to guide potential future clinical trials.
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Spinale JM, Ruebner RL, Copelovitch L, Kaplan BS. Long-term outcomes of Shiga toxin hemolytic uremic syndrome. Pediatr Nephrol 2013; 28:2097-105. [PMID: 23288350 DOI: 10.1007/s00467-012-2383-6] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Revised: 11/17/2012] [Accepted: 11/19/2012] [Indexed: 01/10/2023]
Abstract
Shiga toxin-producing Escherichia coli (STEC) hemolytic uremic syndrome (HUS) is an important cause of acute kidney injury (AKI). The outcomes of STEC HUS have improved, and the acute mortality rate in children is 1-4%. About 70% of patients recover completely from the acute episode and the remainder have varying degrees of sequelae. Only a few retrospective studies have reviewed these patients over long periods. Methodological flaws include a lack of strict definitions, changing modes of treatment, ascertainment bias and loss of subjects to follow-up. The kidneys bear the brunt of the long-term damage: proteinuria (15-30% of cases); hypertension (5-15%); chronic kidney disease (CKD; 9-18%); and end-stage kidney disease (ESKD; 3%). A smaller number have extra-renal sequelae: colonic strictures, cholelithiasis, diabetes mellitus or brain injury. Most renal sequelae are minor abnormalities, such as treatable hypertension and/or variable proteinuria. Most of the patients who progress to ESKD do not recover normal renal function after the acute episode. Length of anuria (more than 10 days) and prolonged dialysis are the most important risk factors for a poor acute and long-term renal outcome. After the acute episode all patients must be followed for at least 5 years, and severely affected patients should be followed indefinitely if there is proteinuria, hypertension or a reduced glomerular filtration rate (GFR).
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Affiliation(s)
- Joann M Spinale
- Division of Pediatric Nephrology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
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25
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Abstract
Acute kidney injury (AKI) has been implicated as an independent risk factor for the development of CKD in recent observational studies. The presumption in the nephrology community is that this association represents a causal relationship. However, because of potential problems related to residual confounding (shared risk factors), ascertainment bias (sicker patients have more follow-up assessments), misclassification of exposure (problems with defining baseline kidney function and AKI representing a discrete event versus progression of renal disease), and misclassification of outcome (de novo CKD versus CKD progression), it is difficult to conclude with certainty that AKI is truly causal for CKD. In this review we highlight several of the Hill causality criteria to examine the existing evidence and point out the missing elements that preclude defining AKI as a cause of CKD in the general population. Only well-designed studies with rigorous assessment of kidney function in all participants (AKI and non-AKI) before and after the episode or hospitalization or randomized, controlled trials demonstrating that prevention or treatment of AKI reduces the incidence of subsequent CKD can clarify the causal nature of the AKI-CKD relationship.
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Affiliation(s)
- Dena E Rifkin
- Harold Simmons Center for Chronic Disease Research and Epidemiology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 West Carson Street, C1-Annex, Torrance, CA 90509-2910, USA
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26
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Chronic renal disease is more prevalent in patients with hemolytic uremic syndrome who had a positive history of diarrhea. Kidney Int 2010; 78:598-604. [DOI: 10.1038/ki.2010.174] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Lumbreras Fernández J, Cruz Rojo J, Iñigo Martín G, Muley Alonso R, Vara Martín J. [Hemolytic uremic syndrome: long term renal injury]. An Pediatr (Barc) 2010; 72:309-16. [PMID: 20347408 DOI: 10.1016/j.anpedi.2009.12.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2009] [Revised: 12/19/2009] [Accepted: 12/21/2009] [Indexed: 10/19/2022] Open
Abstract
INTRODUCTION Hemolytic uremic syndrome (HUS) is the most frequent cause of non-pre-renal acute renal failure in pediatrics and it is usually secondary to acute infectious diarrhea, generally due to Shiga-toxin producing E. coli. It is characterized by acute renal failure, hemolytic anemia and thrombocytopenia. It can lead to renal sequels in the long term and to end-stage renal disease. METHODS The aim of this retrospective study is to describe and analyze renal sequels and their prognostic factors in pediatric patients suffering from HUS in a Spanish tertiary hospital during the last 28 years. RESULTS 43 children with this condition were admitted, with 38 of them having presented with diarrhea previously. Among those with a follow-up longer than 3 months, 21.6% (8/37) had a reduction in glomerular filtration rate (GFR) in the last visit. Including proteinuria and hypertension, we found up to 35.1% (13/37) prevalence of chronic kidney disease, with 8.1% (3/37) of the patients with end-stage renal disease. We found the following to be prognostic factors for renal injury in the long term in a univariate logistic regression: hypertension, a longer stay in the hospital, more prolonged anuria, more severe leukocytosis and lower GFR at discharge. Multivariate logistic regression showed an association with time in anuria. CONCLUSIONS Approximately one third of our cases of hemolytic uremic syndrome developed some degree of chronic kidney disease in the long term. A deeper and longer initial renal disfunction is associated with a higher probability of subsequent renal problems.
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Affiliation(s)
- J Lumbreras Fernández
- Sección de Nefrología Infantil, Hospital Universitario 12 de Octubre, Madrid, España.
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Abstract
PURPOSE OF REVIEW Albuminuria is a marker of present and future cardiovascular and renal morbidity, and mortality, in adults. Because the roots of these diseases extend back into childhood, assessment of albuminuria has become relevant to child and adolescent clinical care. RECENT FINDINGS Normal levels of albumin excretion in children are well below the cut-off for microalbuminuria. In healthy children, albuminuria relates to fasting insulin, but not blood pressure, BMI, lipid levels, fasting glucose, or insulin resistance. In obese children, albuminuria relates to multiple measures of insulin resistance. In children with type 1 diabetes, hemoglobin A1c seems to be the most consistent clinical predictor of microalbuminuria although multiple mechanisms seem to be involved, including genetic polymorphisms. Children with type 2 diabetes and hypertension already exhibit microalbuminuria. SUMMARY When considering the population as a whole, children make ideal subjects in which to study the natural history of albuminuria given their relative lack of multiple morbidities commonly seen in adults. The unfortunate rise in 'adult' diseases in the pediatric age group makes this especially relevant. There is a need for longitudinal studies examining predictors of elevated urinary albumin levels as well as potential treatment strategies.
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Garg AX, Salvadori M, Moist LM, Suri RS, Clark WF. Renal prognosis of toxigenic Escherichia coli infection. Kidney Int 2009:S38-41. [DOI: 10.1038/ki.2008.617] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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