Browsing by Author "Vogel, Andrea"

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    Decreased Nitric Oxide Products in the Urine of Patients Undergoing Cardiac Surgery
    (W B SAUNDERS CO-ELSEVIER INC, 2009) Lema, Guillermo; Urzua, Jorge; Jalil, Roberto; Canessa, Roberto; Vogel, Andrea; Moran, Sergio; Fajuri, Alejandro; Carvajal, Claudia; Aeschlimann, Nicolas; Jaque, Maria P.
    Objective: Renal vasoconstriction has been blamed as a cause of perioperative renal dysfunction after cardiac surgery. Endothelial function is a critical determinant of vascular tonus, including vasoconstriction. The objective of this study was to establish whether the release of the endothelial vasodilator nitric oxide (NO) or NO products is altered in patients undergoing surgery with cardiopulmonary bypass in 3 different clinical conditions.
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    Management of Anemia in Children Receiving Chronic Peritoneal Dialysis
    (2013) Borzych-Duzalka, Dagmara; Bilginer, Yelda; Ha, Il Soo; Bak, Mustafa; Rees, Lesley; Cano, Francisco; Loza Munarriz, Reyner; Chua, Annabelle; Pesle, Silvia; Emre, Sevinc; Urzykowska, Agnieszka; Quiroz, Lily; Dario Ruscasso, Javier; White, Colin; Pape, Lars; Ramela, Virginia; Printza, Nikoleta; Vogel, Andrea; Kuzmanovska, Dafina; Simkova, Eva; Mueller-Wiefel, Dirk E.; Sander, Anja; Warady, Bradley A.; Schaefer, Franz
    Little information exists regarding the efficacy, modifiers, and outcomes of anemia management in children with CKD or ESRD. We assessed practices, effectors, and outcomes of anemia management in 1394 pediatric patients undergoing peritoneal dialysis (PD) who were prospectively followed in 30 countries. We noted that 25% of patients had hemoglobin levels below target (<10 g/dl or <9.5 g/dl in children older or younger than 2 years, respectively), with significant regional variation; levels were highest in North America and Europe and lowest in Asia and Turkey. Low hemoglobin levels were associated with low urine output, low serum albumin, high parathyroid hormone, high ferritin, and the use of bioincompatible PD fluid. Erythropoiesis-stimulating agents (ESAs) were prescribed to 92% of patients, and neither the type of ESA nor the dosing interval appeared to affect efficacy. The weekly ESA dose inversely correlated with age when scaled to weight but did not correlate with age when normalized to body surface area. ESA sensitivity was positively associated with residual diuresis and serum albumin and inversely associated with serum parathyroid hormone and ferritin. The prevalence of hypertension and left ventricular hypertrophy increased with the degree of anemia. Patient survival was positively associated with achieved hemoglobin and serum albumin and was inversely associated with ESA dose. In conclusion, control of anemia in children receiving long-term PD varies by region. ESA requirements are independent of age when dose is scaled to body surface area, and ESA resistance is associated with inflammation, fluid retention, and hyperparathyroidism. Anemia and high ESA dose requirements independently predict mortality. J Am Soc Nephrol 24: 665-676, 2013. doi: 10.1681/ASN.2012050433
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    Renal function and cardiopulmonary bypass in pediatric cardiac surgical patients
    (2006) Lema, Guillermo; Vogel, Andrea; Canessa, Roberto; Jalil, Roberto; Carvajal, Claudia; Becker, Pedro; Jaque, Maria Paz; Fajardo, Christian; Urzua, Jorge
    We studied prospectively the perioperative changes of renal function in nine children undergoing cardiac surgery with cardiopulmonary bypass (CPB). Glomerular filtration rate (GFR) and effective renal plasma flow (ERPF) were measured with inulin and I-131-hippuran clearances before CPB, during hypo and normothermic CPB, following sternal closure and 1 h postoperatively. Urinary alpha glutathione S-transferase (alpha GS-T) was measured pre- and postoperatively as a marker for tubular cellular damage. Plasma and urine creatinine and electrolytes were measured. Free water, osmolal and creatinine clearances, as well as fractional excretion of sodium (FeNa) and potassium transtubular gradient (TTKG) were calculated. GFR was normal before and after surgery. ERPF was low before and after surgery; it increased significantly immediately after CPB. Filtration fraction (FF) was abnormally elevated before and after surgery; however, a significant decrease during normothermic CPB and sternal closure was found. Alpha GS-T presented a moderate, but nonsignificant increase postoperatively. FeNa also increased in this period, but not significantly. Creatinine, osmolal, free water clearances, as well as TTKG, were normal in all patients pre- and postoperatively. We conclude that there is no evidence of clinically significant deterioration of renal function in children undergoing repair of cardiac lesions under CPB. Minor increases of alpha GS-T in urine postoperatively did not confirm cellular tubular damage. There was no tubular dysfunction at that time.
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    Syncope A Rare Presentation of Massive Pulmonary Embolism in a Previously Healthy Girl
    (LIPPINCOTT WILLIAMS & WILKINS, 2010) Ronco, Ricardo; Catalan, Javiera; Salgado, Carmen; Vogel, Andrea
    Pulmonary embolism is a very infrequent event in previously healthy children, particularly in the outpatient scenario.
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    The bone and mineral disorder of children undergoing chronic peritoneal dialysis
    (ELSEVIER SCIENCE INC, 2010) Borzych, Dagmara; Rees, Lesley; Ha, Il Soo; Chua, Annabelle; Valles, Patricia G.; Lipka, Maria; Zambrano, Pedro; Ahlenstiel, Thurid; Bakkaloglu, Sevcan A.; Spizzirri, Ana P.; Lopez, Laura; Ozaltin, Fatih; Printza, Nikoleta; Hari, Pankaj; Klaus, Guenter; Bak, Mustafa; Vogel, Andrea; Ariceta, Gema; Yap, Hui Kim; Warady, Bradley A.; Schaefer, Franz; IPPN
    The mineral and bone disorder of chronic kidney disease remains a challenging complication in pediatric end-stage renal disease. Here, we assessed symptoms, risk factors and management of this disorder in 890 children and adolescents from 24 countries reported to the International Pediatric Peritoneal Dialysis Network Registry. Signs of this disease were most common in North American patients. The prevalence of hyperphosphatemia increased with age from 6% in young infants to 81% in adolescents. Serum parathyroid hormone (PTH) was outside the guideline targets in the majority of patients and associated with low calcium, high phosphorus, acidosis, dialysis vintage and female gender. Serum calcium was associated with dialytic calcium exposure, serum phosphorus with low residual renal function and pubertal status. PTH levels were highest in Latin America and lowest in Europe. Vitamin D and its active analogs were most frequently administered in Europe; calcium-free phosphate binders and cinacalcet in North America. Clinical and radiological symptoms markedly increased when PTH exceeded 300 pg/ml, the risk of hypercalcemia increased with levels below 100 pg/ml, and time-averaged PTH concentrations above 500 pg/ml were associated with impaired longitudinal growth. Hence, the symptoms and management of the mineral and bone disorder of chronic kidney disease in children on peritoneal dialysis showed substantial regional variation. Our findings support a PTH target range of 100-300 pg/ml in the pediatric age group. Kidney International (2010) 78, 1295-1304; doi:10.1038/ki.2010.316; published online 1 September 2010