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- W1972376732 abstract "Mild induced hypothermia is used for neuroprotection in patients successfully resuscitated after cardiac arrest. Temperature-dependent effects on rotational thromboelastometry (ROTEM®) assays with EXTEM®, FIBTEM®, or APTEM® in cardiac arrest patients have not previously been studied. Ten patients with out-of-hospital cardiac arrest who underwent induced hypothermia were studied during stable hypothermia at 33°C. ROTEM temperature effects on EXTEM, FIBTEM, and APTEM assays were studied at temperatures set between 30°C and 42°C. Citrated whole blood test tubes were incubated in temperature-adjusted heating blocks and then investigated at respective temperature in the temperature-adjusted ROTEM. The following variables were determined: clotting time (CT), clot formation time (CFT), α-angle, and maximum clot firmness (MCF). The results from hypo- and hyperthermia samples were compared with the samples incubated at 37°C using the Wilcoxon matched-pairs signed-rank test. A p-value of <0.05 was considered significant. CT-EXTEM® and CT-APTEM® were prolonged by hypothermia at 30°C (p<0.01 for both) and 33°C (p<0.05 for both). Hyperthermia at 42°C shortened CT-EXTEM (p<0.05) and CT-APTEM (p<0.01). CFT-EXTEM® and CFT-APTEM® were markedly prolonged by hypothermia at 30°C, 33°C, and 35°C (p<0.01 for all except CFT-EXTEM, 35°C [p<0.05]). The α-angle-EXTEM was markedly decreased at 30°C, 33°C, and 35°C (p<0.01) but increased at 40°C (p<0.05) and 42°C (p<0.01); α-angle-APTEM showed similar results. MCF was unchanged at different temperatures for all tests. ROTEM (EXTEM, FIBTEM, and APTEM assays) revealed a hypocoagulative response to in vitro-applied hypothermia in the blood of cardiac arrest patients reflected in the prolonged clot initiation and decreased clot propagation. Hyperthermia showed the opposite effects. Clot firmness was not affected by temperature." @default.
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- W1972376732 date "2014-09-01" @default.
- W1972376732 modified "2023-10-16" @default.
- W1972376732 title "Wide Temperature Range Testing with ROTEM Coagulation Analyses" @default.
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- W1972376732 doi "https://doi.org/10.1089/ther.2014.0005" @default.
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