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Query: UMLS:C0020672 (hypothermia)
 17,327 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We are entering an era in which hypothermia will be used in combination with other novel neuroprotective interventions. The targeting of multiple sites in the cascade leading to brain injury may prove to be a more effective treatment strategy after hypoxic-ischemic encephalopathy in newborn infants than hypothermia alone.
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PMID:Hypothermia for hypoxic-ischemic encephalopathy. 1902 36

Clinicians who are convinced by the available evidence that cooling is a safe and effective treatment of hypoxic-ischemic encephalopathy in the term or near-term infant are now faced with a series of decisions around implementation of therapeutic hypothermia in their neonatal ICU or region. There is currently uncertainty about the efficacy of cooling or at least the magnitude of the effect, and precise estimates of the benefit of cooling must await the publication of the results of the several pending trials. This article assumes that clinicians are sufficiently convinced by the available evidence of safety and efficacy to proceed to the implementation step and offers guidelines for starting a neonatal cooling program.
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PMID:Technical aspects of starting a neonatal cooling program. 1902 39

Neonatal encephalopathy is associated with a high risk of morbidity and mortality in the neonatal period and of long-term neurodevelopmental disability in survivors. Advanced magnetic resonance techniques now play a major role in the clinical care of newborns with encephalopathy and in research addressing this important condition. From conventional magnetic resonance imaging, typical patterns of injury have been defined in neonatal encephalopathy. When applied in contemporary cohorts of newborns with encephalopathy, the patterns of brain injury on magnetic resonance imaging distinguish risk factors, clinical presentation, and risk of abnormal outcome. Advanced magnetic resonance techniques such as magnetic resonance spectroscopy, diffusion-weighted imaging, and diffusion tensor imaging provide novel perspectives on neonatal brain metabolism, microstructure, and connectivity. With the application of these imaging tools, it is increasingly apparent that brain injury commonly occurs at or near the time of birth and evolves over the first weeks of life. These observations have complemented findings from trials of emerging strategies of brain protection, such as hypothermia. Application of these advanced magnetic resonance techniques may enable the earliest possible identification of newborns at risk of neurodevelopmental impairment, thereby ensuring appropriate follow-up with rehabilitation and psychoeducational resources.
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PMID:Advanced neuroimaging techniques for the term newborn with encephalopathy. 1921 31

Neonatal brain injury remains a common cause of developmental disability, despite tremendously enhanced obstetrical and neonatal care. The timing of brain injury occurs throughout gestation, labor, and delivery, providing an evolving form of brain injury and a moving target for therapeutic intervention. Nonetheless, markedly improved methods are available to identify those infants injured at birth, via clinical presentation with neonatal encephalopathy and neuroimaging techniques. Postischemic hypothermia has been shown to be of tremendous clinical promise in several completed and ongoing trials. As part of this approach to the treatment of the newborn, other parameters of physiologic homeostasis can and should be attended to, with strong animal and clinical evidence that their correction will have dramatic influence on the outcome of the newborn infant. This review addresses aspects of newborn care to which we can direct our attention currently, and which should result in a safe and efficacious improvement in the prognosis of the newborn with neonatal encephalopathy.
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PMID:Treatment of the term newborn with brain injury: simplicity as the mother of invention. 1921 37

It has been proposed that proinflammatory mechanisms are involved in the pathogenesis of brain edema in acute liver failure (ALF). The aim of this study was to assess the contribution of cerebral inflammation to the neurologic complications of ALF and to assess the antiinflammatory effect of mild hypothermia. Upregulation of CD11b/c immunoreactivity, consistent with microglial activation, was observed in the brains of ALF rats at coma stages of encephalopathy. Interleukin-1beta (IL-1beta), tumor necrosis factor-alpha (TNF-alpha), and interleukin-6 (IL-6) mRNAs were increased two to threefold in the brains of ALF rats compared with that in sham-operated controls. The magnitude of increased expression of proinflammatory cytokines in the brain was correlated with the progression of encephalopathy and the onset of brain edema. Significant increases in IL-1beta, IL-6, and TNF-alpha levels were also found in the sera and cerebrospinal fluid (CSF) of these animals. Mild hypothermia delayed the onset of encephalopathy, prevented brain edema, and concomitantly attenuated plasma, brain, and CSF proinflammatory cytokines. These results show that experimental ALF leads to increases in brain production of proinflammatory cytokines, and afford the first direct evidence that central inflammatory mechanisms play a role in the pathogenesis of the cerebral complications of ALF. Antiinflammatory agents could be beneficial in the management of these complications.
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PMID:Direct evidence for central proinflammatory mechanisms in rats with experimental acute liver failure: protective effect of hypothermia. 1925 10

In this article, the role of hypothermia and neuroprotection for neonatal encephalopathy will be discussed. The incidence of encephalopathy due to hypoxia ischemia as well as the pathophysiology will be presented. The diagnosis of encephalopathy in full-term neonates will be discussed. The current management of brain injury that occurs with hypoxia ischemia and the role of hypothermia in preventing brain injury in fetal and neonatal animal models will be reviewed. The current data from randomized control trials of hypothermia as neuroprotection for full-term infants will be presented along with the results of meta-analyses of these trials. Lastly, the status of ongoing neonatal hypothermia trials will be summarized.
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PMID:Neonatal encephalopathy: treatment with hypothermia. 1928 15

Therapeutic moderate hypothermia has been advocated for use in traumatic brain injury, stroke, cardiac arrest-induced encephalopathy, neonatal hypoxic-ischemic encephalopathy, hepatic encephalopathy, and spinal cord injury, and as an adjunct to aneurysm surgery. In this review, we address the trials that have been performed for each of these indications, and review the strength of the evidence to support treatment with mild/moderate hypothermia. We review the data to support an optimal target temperature for each indication, as well as the duration of the cooling, and the rate at which cooling is induced and rewarming instituted. Evidence is strongest for prehospital cardiac arrest and neonatal hypoxic-ischemic encephalopathy. For traumatic brain injury, a recent meta-analysis suggests that cooling may increase the likelihood of a good outcome, but does not change mortality rates. For many of the other indications, such as stroke and spinal cord injury, trials are ongoing, but the data are insufficient to recommend routine use of hypothermia at this time.
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PMID:Current and future role of therapeutic hypothermia. 1929 97

Therapeutic hypothermia has recently emerged from bench to bedside. Three large multicenter trials from industrialized countries and three independent meta-analyses have shown its efficacy in reducing death and disability following neonatal encephalopathy due a perinatal hypoxic event. Many neonatal units in well-resourced settings now offer hypothermia as standard care in neonatal encephalopathy. However, these results cannot be extrapolated to low resource settings due to differences in population, risk benefits and high cost. Use of therapeutic hypothermia in low resource settings should be considered experimental and should therefore be restricted to well equipped level 2 and 3 neonatal units. The safety and efficacy of hypothermia using novel low technology methods need to be examined in rigorously controlled multicenter randomized controlled trials in these neonatal units before it can be offered as a standard care, as the risks may outweigh the benefits. The current practice of maintaining normothermia should continue, until such evidence is available.
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PMID:Therapeutic hypothermia for neonatal encephalopathy implications for neonatal units in India. 1938 87

Increasing evidence in animal models and clinical trials for stroke, hypoxic encephalopathy for children, and traumatic brain injury have shown that mild hypothermia may attenuate ischemic damage and improve neurological outcome. However, it is less clear if mild intraoperative hypothermia during vascular neurosurgical procedures results in improved outcomes for patients. This review examines the scientific evidence behind hypothermia as a treatment and discusses factors that may be important for the use of this adjuvant technique, including cooling temperature, duration of hypothermia, and rate of rewarming.
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PMID:Intraoperative hypothermia during vascular neurosurgical procedures. 1940 3

Amplitude-integrated electroencephalography (aEEG) is used for determination of severity of hypoxic-ischemic encephalopathy and eligibility for hypothermia therapy in infants. We evaluate susceptibility of the aEEG to machine differences, impedance mismatch, electrode placement, and interelectrode distance in preparation for further clinical studies. Frequency-response curves were obtained from manufacturers of aEEG systems. The mean of the quantified aEEG and the median lower border of amplitude were derived from digital EEG recordings. Impedance effects were evaluated by inserting resistors ranging from 1 kOmega to1 MOmega into inputs G1/G2 while recording from a looped-signal generator. Interelectrode distance effects were evaluated from simultaneous recordings from electrodes placed at 5% to 30% of the preauricular notch distance from a healthy human subject. Electrode location effects were evaluated by comparing Q-aEEG from C3-C4 versus P3-P4 from 10 term infants. Frequency-response curves differed up to 20 dB for particular frequencies. Impedance mismatch distorted EEG and aEEG, but did not significantly change Q-aEEG. Increasing interelectrode distances significantly increased Q-aEEG. Central Q-aEEG values were significantly higher than parietal. Comparisons of aEEG must carefully account for differences in machines, interelectrode distances, and electrode locations. Q-aEEG may offer a rigorous method of evaluating hypoxic-ischemic encephalopathy.
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PMID:Engineering aspects of the quantified amplitude-integrated electroencephalogram in neonatal cerebral monitoring. 1942 83


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