Clin Nephrol
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The cardiac biomarkers cardiac Troponin T (cTNT) and NT-proBNP tend to be elevated in nearly all hemodialysis patients. The high percentage and magnitude of these increased molecules is associated with cardiovascular morbidity and mortality in hemodialysis patients. This study investigates the impact of the dialysis procedure itself on cardiac biomarkers. ⋯ Asymptomatic chronic hemodialysis patients have significantly higher levels of the cardiac biomarkers cTNT and NT-proBNP relative to the general population. The levels are associated with the time of measurement (before and after a hemodialysis session). Dialysis modalities like high-flux dialyzers influence cTNT and NT-proBNP levels and should be taken into account, particularly in patients with acute onset of cardiac ischemia. The elevation of cTNT and NT-proBNP levels after hemodialysis using a low-flux dialyzer are partly due to hemoconcentration. The significant association of cTNT and NT-proBNP with non-native fistulas (catheter or graft) may be due to the chronic inflammation commonly caused by these devices. Both cardiac biomarkers are of prognostic value determining cardiovascular events and death.
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Acute kidney injury (AKI) is frequent in hospitalized critically ill patients and mortality associated with AKI is largely unchanged over many decades. The new nomenclature, AKI, reflects the entire spectrum of acute renal failure, recognizing that an acute decline in kidney function can be secondary to an injury that causes functional or structural changes in the kidneys [Mehta et al. 2007]. An abrupt change in serum creatinine level has been the primary method for diagnosing AKI for nearly 60 years despite its well recognized limitations [Addis et al. 1947, Barrett and Addis 1947, Fisher and Wilhelmi 1937, Star 1998]. ⋯ It is now widely believed that the availability of accurate and objective early biomarkers of AKI will stimulate progress in the development of early interventions in AKI. Recognition of this concept has led to a surge in preclinical, translational and clinical research for discovery and validation of biomarkers in AKI. In this review we will discuss the role of biomarkers in AKI and the promising biomarkers on the horizon.
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Clinical Trial
Efficacy and safety of intermittent hemodialysis using citrate as anticoagulant: a prospective study.
The use of trisodium-citrate for regional anticoagulation of the extracorporal circuit during renal replacement therapy (RRT) has received increased interest, particularly in critically ill patients with increased risk of bleeding. Continuous renal replacement therapies are the most extensively investigated and used procedures in this regard. However, when patients recover from critical illness, RRT is often switched to intermittent procedures. In this prospective study, we investigated the efficacy and safety of citrate anticoagulation during intermittent hemodialysis (IHD) performed with a standard roller blood pump device. ⋯ Intermittent hemodialysis with citrate anticoagulation can be safely applied in critically ill patients at high risk of bleeding.
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Case Reports
Sirolimus-associated diffuse alveolar hemorrhage in a renal transplant recipient on long-term anticoagulation.
Sirolimus (rapamycin, rapamune) is an effective immunosuppressant that has been widely used in solid organ transplantation. Recently, two disconcerting side effects, namely pulmonary toxicity, usually in the form of interstitial pneumonitis, and the onset of nephrotic range proteinuria, have been recognized. We report the case of a renal transplant recipient who had been on chronic anticoagulation therapy for a mechanical aortic valve, and who developed pulmonary distress necessitating emergent intubation 18 days after starting sirolimus therapy. ⋯ Urine protein/creatinine ratio at that time was 16.7. Upon discontinuation of sirolimus, alveolar hemorrhage and nephrotic range proteinuria resolved. We suggest that extra vigilance be paid in individuals who are on chronic anticoagulation and who are started on sirolimus.
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The hyperammonemia in distal renal tubular acidosis, previously only described in two cases, is considered an unusual occurrence. After the report published in 2005, we observed plasma ammonia levels above normal range during metabolic decompensation in two other consecutive pediatric patients suffering from distal renal tubular acidosis. ⋯ In distal renal tubular acidosis, hyperammonemia is probably the result of an imbalance between the increased ammonia synthesis, in response to metabolic acidosis, and the impaired ammonia excretion, typical of distal renal tubular acidosis. According to this physiopathological mechanism, our observation shows that hyperammonemia is not an uncommon finding in distal renal tubular acidosis, and should be included among differential diagnosis of hyperammonemia in infants and children.