Blood purification
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Since the introduction of the new pathophysiological concept of pathogen-associated molecular patterns (PAMPS) and alarmins, endotoxin has been recognized as only one of the PAMPS. It is widely accepted that hypercytokinemia plays a pivotal role in the pathophysiology of sepsis. ⋯ We report that continuous hemodiafiltration (CHDF) with a cytokine-adsorbing hemofilter (CAH), such as polymethyl methacrylate hemofilter and AN69ST hemofilter (CAH-CHDF), can remove many kinds of cytokines and has been very effective in the treatment of severe sepsis and septic shock. Based on the understanding of the recent pathophysiology, we suggest that CAH-CHDF is an alternate therapy to direct hemoperfusion with endotoxin-adsorbing column in the treatment of sepsis.
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Renal replacement therapy (RRT) is used in a wide variety of pediatric populations. In this article, we will review the advantages and disadvantages of the different RRT modalities and the technical aspects of providing pediatric RRT. In addition, we will review the use of RRT with extracorporeal membrane oxygenation, the use of continuous RRT in the critically ill child with acute kidney injury and fluid overload, and the use of RRT for the removal of toxins and treatment of inborn errors of metabolism.
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Review Historical Article
Extracorporeal carbon dioxide removal: the future of lung support lies in the history.
Extracorporeal organ support in patients with dysfunction of vital organs like the kidney, heart, and liver has proven helpful in bridging the patients to recovery or more definitive therapy. Mechanical ventilation in patients with respiratory failure, although indispensable, has been associated with worsening injury to the lungs, termed ventilator-induced lung injury. Application of lung-protective ventilation strategies are limited by inevitable hypercapnia and hypercapnic acidosis. ⋯ In particular, the venovenous approach to effective carbon dioxide removal, which involves minimal invasiveness comparable to renal replacement therapy, appears to be very promising. The clinical applications of these extracorporeal carbon dioxide removal therapies may extend beyond just lung protection in ventilated patients. This article summarizes the rationale, technology and clinical application of various extracorporeal lung assist techniques available for clinical use, and some of the future perspectives in the field.
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Mediator removal from tissue (capillary blood compartment, CABC) and transport to the central circulation (central blood compartment, CEBC) must be effective. Effectiveness through a passive mechanism seems unlikely as the surface of CEBC (30 m(2)) is smaller than CABC (300 m(2)) whereby the former will be a limiting factor in passive transport. According to studies, a high exchange volume can induce an 80-fold increase in lymphatic flow. ⋯ The DO-RE-MI trial underscored the importance of delivery which could be obtained by targeting doses between 5 and 10 ml/kg/h higher than prescribed. Until the IVOIRE trial becomes available, septic AKI should be treated by continuous veno-venous hemofiltration at 35 ml/kg/h. In non-septic AKI, 25 ml/kg/h remains optimal.
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Continuous renal replacement therapy (CRRT) is increasingly used for the management of critically ill patients. As a consequence, the incidence of complications that accompany CRRT is also rising. ⋯ A mainstay of this approach is the utilization of a dedicated checklist for improving CRRT quality and patient safety. In this context, we discuss the most important adverse effects of CRRT and review current strategies to minimize them.