Critical care medicine
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Critical care medicine · Jul 2009
ReviewHypothermia for the treatment of ischemic and hemorrhagic stroke.
Hypothermia is considered nature's "gold standard" for neuroprotection, and its efficacy for improving outcome in patients with hypoxic-ischemic brain injury as a result of cardiac arrest is well-established. Hypothermia reduces brain edema and intracranial pressure in patients with traumatic brain injury. By contrast, only a few small pilot studies have evaluated hypothermia as a treatment for acute ischemic stroke, and no controlled trials of hypothermia for hemorrhagic stroke have been performed. ⋯ Sustained fever control is feasible in patients with intracerebral and subarachnoid hemorrhage, but has yet to be tested in a phase III study. Important observations from studies investigating the use of hypothermia for stroke to date include the necessity for proactive antishivering therapy for successful cooling, the importance of slow controlled rewarming to avoid rebound brain edema, and the high risk for infectious and cardiovascular complications in this patient population. More research is clearly needed to bring us closer to the successful application of hypothermia in the treatment for stroke.
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Critical care medicine · Jul 2009
ReviewHypothermia after cardiac arrest: expanding the therapeutic scope.
Therapeutic hypothermia for 12 to 24 hrs following resuscitation from out-of-hospital cardiac arrest is now recommended by the American Heart Association for the treatment of neurological injury when the initial cardiac rhythm is ventricular fibrillation. However, the role of therapeutic hypothermia is uncertain when the initial cardiac rhythm is asystole or pulseless electrical activity, or when the cardiac arrest is primarily due to a noncardiac cause, such as asphyxia or drug overdose. ⋯ Given that the side effects of therapeutic hypothermia are generally easily managed in the critical care setting, and there is benefit for anoxic brain injury demonstrated in laboratory studies, consideration may be given to treat comatose post-cardiac arrest patients with therapeutic hypothermia in this setting. Because the induction of therapeutic hypothermia has become more feasible with the development of simple intravenous cooling techniques and specialized equipment for improved temperature control in the critical care unit, it is expected that therapeutic hypothermia will become more widely used in the management of anoxic neurological injury whatever the presenting cardiac rhythm.
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Critical care medicine · Jul 2009
ReviewPrinciples of antibacterial dosing in continuous renal replacement therapy.
To outline the concepts involved in optimizing antibacterial dosing in critically ill patients with acute renal failure undergoing continuous renal replacement therapy (CRRT), provide a strategy for optimizing dosing, and summarize the data required to implement the strategy. ⋯ Appropriate dose calculation requires knowledge of the pharmacokinetic target and the usual minimum inhibitory concentration of the suspected organism in the patient's locality (or if unavailable, the break point for the organism), published pharmacokinetic data (volume of distribution, non-CRRT clearance) on critically ill patients receiving CRRT (which may differ substantially from noncritically ill patients or those without renal failure), the sieving or saturation coefficient of the relevant drug in critically ill patients, the dose and mode of CRRT being used, and the actual dose of CRRT that is delivered. This large number of variables results in considerable inter- and intrapatient heterogeneity in dose requirements. This article provides basic principles and relevant data to guide the clinician in prescribing individualized dosing regimes.
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Critical care medicine · Jul 2009
ReviewTherapeutic hypothermia after cardiac arrest in clinical practice: review and compilation of recent experiences.
We sought to review findings from recent literature on the postresuscitation care of cardiac arrest patients using therapeutic hypothermia as part of nontrial treatment. ⋯ The survival and neurological outcomes benefit from therapeutic hypothermia are robust when compared over a wide range of studies of actual implementation.
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In this article, the role of modest hypothermia for the treatment of experimental and clinical spinal cord injury (SCI) is discussed. While early investigations evaluated the beneficial effects of more profound levels of local hypothermia treatment following SCI, recent studies have concentrated on the benefits of mild hypothermia in protecting and promoting functional recovery in established animal models. ⋯ Modest systemic hypothermia was reported to be both safe and achievable in severely injured SCI patients. This evidence-based review summarizes both experimental and clinical data to support the use of modest hypothermia in the acute SCI setting.