Best practice & research. Clinical anaesthesiology
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Best Pract Res Clin Anaesthesiol · Dec 2008
ReviewThermal management during anaesthesia and thermoregulation standards for the prevention of inadvertent perioperative hypothermia.
Incidence of inadvertent perioperative hypothermia is still high, and thus thermoregulatory standards are warranted. This review summarizes current evidence of thermal management during anaesthesia, referring to recognized clinical queries (temperature measurement, definition of hypothermia, risk factors, warming methods, implementation strategies). Body temperature is a vital sign, and 37 degrees C is the mean core temperature of a healthy human. ⋯ The patient's body temperature should be above 36 degrees C before induction of anaesthesia, and should be measured continuously throughout surgery. Active warming should be applied intraoperatively. Postoperative patient temperature and outcomes should be evaluated.
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Perioperative hypothermia is a common and serious complication of anesthesia and surgery and is associated with many adverse perioperative outcomes. It prolongs the duration of action of inhaled and intravenous anesthetics as well as the duration of action of neuromuscular drugs. Mild core hypothermia increases thermal discomfort, and is associated with delayed post anaesthetic recovery. ⋯ Hypothermia adversely affects antibody- and cell-mediated immune defences, as well as the oxygen availability in the peripheral wound tissues. Furthermore mild hypothermia triples the incidence of postoperative adverse myocardial events. Thus, even mild hypothermia contributes significantly to patient care costs and needs to be avoided.
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Best Pract Res Clin Anaesthesiol · Dec 2008
ReviewTherapeutic hypothermia after cardiac arrest and myocardial infarction.
About 17 million people worldwide die from cardiovascular diseases each year. Impaired neurologic function after sudden cardiac arrest is a major cause of death in these patients. Up to now, no specific post-arrest therapy was available to improve outcome. ⋯ A broad implementation of this new therapy could save thousands of lives worldwide, as only 6 patients have to be treated to get one additional patient with favourable neurological recovery. At present, myocardial reperfusion by thrombolytic therapy or primary PCI as early as possible is the most effective therapy in patients with acute myocardial infarction. Mild therapeutic hypothermia might be a promising new therapy to prevent reperfusion injury after myocardial infarction, but its use in daily clinical routine cannot be recommended with the available evidence.
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Best Pract Res Clin Anaesthesiol · Dec 2008
ReviewHyperthermia during anaesthesia and intensive care unit stay.
Nosocomial hyperthermia (fever) occurs in about 30% of all medical patients at some time during their hospital stay. In patients admitted to the intensive care unit with severe sepsis the incidence of hyperthermia is greater than 90%, while in a specialized neurological critical care unit the incidence is reported as 47%. In contrast, hyperthermia during anaesthesia is rare owing to the impairment of thermoregulation by anaesthetic agents. This article is designed to give an overview on the various causes of hyperthermia with special emphasis on fever during general and regional anaesthesia in general and neurological critical care patients.
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This chapter describes the incidence, mechanisms and possible consequences of hypothermia during cardiac surgery, including protection against ischaemia, alteration of the coagulation cascade and the inflammatory response. Various temperature-specific topics related to cardiac surgery are discussed, including the use of hypothermia or normothermia during cardiopulmonary bypass, and the temperature reached during rewarming at the end of cardiopulmonary bypass and its deleterious consequences for the brain (postoperative neurocognitive dysfunction). ⋯ Modern cardiac techniques, such as off-pump surgery and minimal extracorporeal circulation, and their implications for temperature preservation are discussed. Finally, a protocol is proposed that combines mild intra-operative hypothermia with peripheral active warming in order to avoid the need for fast, intense rewarming, thus avoiding the potential incidence of brain damage.