Current opinion in critical care
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Curr Opin Crit Care · Aug 2013
ReviewReappraising Starling: the physiology of the microcirculation.
Vascular permeability is traditionally explained by Starling's principle, describing two opposing forces across the endothelial cell line to maintain compartments in balance. Several contradictions to this principle have recently questioned its validity. ⋯ Starling's principle requires an adaptation to recognize that there is no inward-directed oncotic pressure gradient across the whole anatomical vessel wall. The carrier of vascular barrier competence is the intact endothelial surface layer which might be protected by avoiding intravascular hypervolaemia and limiting inflammation.
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To review recent studies and information on the relationship between fluid administration and kidney function in critically ill patients. ⋯ Clinicians need to weigh the balance between adequate resuscitation of cardiac output and avoidance of fluid overload. Protocolized resuscitation to hemodynamic goals may help achieve these conflicting goals at least in the early phases of critical illness. In critically ill patients with, or at risk of, AKI, clinicians should avoid starch and, possibly, saline solutions.
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This review examines the long-term influence of postoperative complications on survival. Although it is intuitive that complications after surgery worsen short-term outcomes, it is not clear to what extent and why a longer-term relationship may exist. ⋯ Patients that develop postoperative complications and survive the immediate risk period, demonstrate worsened long-term mortality. The field of perioperative medicine is increasingly mandated to identify vulnerable individuals, develop and implement strategies to prevent and treat complications, and provide better care pathways after hospital discharge.
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We presume that biomarkers will improve identification of patients at risk, leading to interventions and treatments that reduce perioperative adverse events. Risk stratification is multifactorial, and a biomarker must add information to this process, thereby redistributing patients to either higher or lower risk categories, to improve the allocation of expensive and risky interventions. This review focuses on the utility of three cardiac biomarkers in perioperative management. ⋯ The findings here suggest an expanded role for postoperative cTn surveillance; however, the precise populations that benefit, or the interventions required, are not yet defined. The encouraging data for the other two biomarkers need more investigations before adopting them into routine clinical use.