Publications by authors named "Zeynep Y Yıldırım"
Background: Primary hyperoxaluria type 1 (PH1) is characterized by increased endogenous oxalate production and deposition as calcium oxalate crystals. The main manifestations are nephrocalcinosis/nephrolithiasis, causing impaired kidney function. We aimed to evaluate the clinical characteristics and overall outcomes of paediatric PH1 patients in Turkey.
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- The study focuses on urinary tract infections (UTIs) in children and investigates the potential use of soluble Toll-like receptors (sTLR4, sTLR5) and interleukin 8 (IL-8) as biomarkers for diagnosing UTIs.
- It involved 520 children, including those with UTIs, non-UTI infections, and healthy controls, measuring urine and serum levels of the biomarkers before and after treatment.
- Results show that urine sTLR4 levels are higher in UTI patients, with a cut-off level identified to predict UTIs, especially higher in cases of pyelonephritis compared to cystitis, and decreasing post-treatment.
While 44-83% of children with steroid-resistant nephrotic syndrome (SRNS) without a proven genetic cause respond to treatment with a calcineurin inhibitor (CNI), current guidelines recommend against the use of immunosuppression in monogenic SRNS. This is despite existing evidence suggesting that remission with CNI treatment is possible and can improve prognosis in some cases of monogenic SRNS. Herein, our retrospective study assessed response frequency, predictors of response and kidney function outcomes among children with monogenic SRNS treated with a CNI for at least three months.
View Article and Find Full Text PDFBackground: Compared with the general population, the immune response to COVID-19 mRNA vaccines is lower in adult kidney transplant recipients (KTRs). However, data is limited for pediatric KTRs. In this study, we aimed to assess humoral and cellular immune responses to the COVID-19 mRNA vaccine in pediatric KTRs.
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- A new study looked at a special urine test called uHSP70 to help tell if kids have a urinary tract infection (UTI) instead of just using regular tests that might not be very reliable.
- The study involved 802 kids and found that uHSP70 levels were much higher in kids with UTI compared to those with other infections or who were healthy.
- Using uHSP70 could help doctors correctly diagnose UTIs and might stop about 80% of kids from getting unnecessary antibiotics.
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- This study examined parathyroid hormone (PTH) levels and phosphate balance in 589 patients with Bartter and Gitelman syndromes, which are conditions that cause salt loss from the kidneys.
- It found that 56% of patients with Bartter syndrome type I and II had elevated PTH levels, indicating frequent hyperparathyroidism, which was linked to lower serum calcium levels.
- Additionally, 22% of the patients had low serum phosphate levels, particularly those with Bartter syndrome type III, suggesting renal phosphate wasting as a common issue in these syndromes.
The study aims to present the incidence of COVID-19 in pediatric patients undergoing renal replacement therapy (RRT) and to compare the severity and outcomes of the disease between the dialysis and kidney transplant (KTx) groups. This multicenter observational study was conducted between 1 April and 31 December 2020 in Istanbul. Members of the Istanbul branch of the Turkish Pediatric Nephrology Association were asked to report all confirmed cases of COVID-19 who were on RRT, as well as the number of prevalent RRT patients under the age of 20.
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- C3 glomerulopathy (C3G) is a rare kidney disease impacting children, characterized by C3 protein buildup in the glomeruli and marked by variable clinical outcomes and symptoms.
- In a study of 60 pediatric patients in Turkey, findings showed common symptoms like hematuria and hypertension, with nephritic-nephrotic syndrome being the most frequent presentation.
- Key predictors of progression to chronic kidney disease stage 5 (CKD5) include lower baseline kidney function (eGFR) and serum albumin levels, highlighting the need for close monitoring in affected children.
Background: Peritoneal dialysis (PD) is the most common kidney replacement therapy in children. Complications associated with PD affect treatment success and sustainability. The aim of this study was to investigate the frequency of PD-related non-infectious complications and the predisposing factors.
View Article and Find Full Text PDFWhile children approaching end-stage kidney disease (ESKD) are considered at risk of uremic anorexia and underweight they are also exposed to the global obesity epidemic. We sought to investigate the variation of nutritional status in children undergoing chronic peritoneal dialysis (CPD) around the globe. The distribution and course of body mass index (BMI) standard deviation score over time was examined prospectively in 1001 children and adolescents from 35 countries starting CPD who were followed in the International Pediatric PD Network (IPPN) Registry.
View Article and Find Full Text PDFBackground: This study aims to identify epidemiological and clinical characteristics of patients and report our experience with eculizumab treatment during an outbreak of hemolytic uremic syndrome (HUS) caused by Shiga toxin-producing Escherichia coli (STEC) in Istanbul in 2015.
Methods: Thirty-two children (21 females, median age 3.25 years) were included in this study.
Background: Atypical hemolytic uremic syndrome (aHUS) is a chronic disease characterized by thrombotic microangiopathy and a high risk of end-stage kidney disease. Dysregulation and/or excessive activation of the complement system results in thrombotic microangiopathy. Interest in extrarenal manifestations of aHUS is increasing.
View Article and Find Full Text PDFBackground: Heat shock proteins (HSPs) are a multi-family group of proteins which are upregulated by the cell in response to exposure to hazardous (stress) factors, including infectious agents, to prevent changes in protein structure. The aim of our study was to assess whether urine levels of the 70-kDa family of HSPs (HSP70s) increase in children with urinary tract infection (UTI) and to determine the optimal urine (u) HSP70 cut-off level to predict UTI in children.
Methods: Forty patients with symptomatic UTI (UTI group), 30 healthy children (control group), 21 asymptomatic patients with proven bacterial contamination in their urine culture (contamination group) and 30 patients with fever caused by other infections (non-UTI infection group) were enrolled in the study.