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Wide Temperature Range Testing with ROTEM Coagulation Analyses.

Kander, Thomas LU ; Brokopp, Jens; Friberg, Hans LU and Schött, Ulf LU (2014) In Therapeutic hypothermia and temperature management 4(3). p.125-130
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Therapeutic hypothermia and temperature management
volume
4
issue
3
pages
125 - 130
publisher
Mary Ann Liebert, Inc.
external identifiers
  • pmid:24933403
  • wos:000352477600006
  • scopus:84929514307
ISSN
2153-7933
DOI
10.1089/ther.2014.0005
language
English
LU publication?
yes
id
41a5c48f-43e8-495c-a05c-104325cc78e7 (old id 4528408)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/24933403?dopt=Abstract
date added to LUP
2014-07-05 21:54:18
date last changed
2017-11-05 03:07:13
@article{41a5c48f-43e8-495c-a05c-104325cc78e7,
  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 &lt;0.05 was considered significant. CT-EXTEM(®) and CT-APTEM(®) were prolonged by hypothermia at 30°C (p&lt;0.01 for both) and 33°C (p&lt;0.05 for both). Hyperthermia at 42°C shortened CT-EXTEM (p&lt;0.05) and CT-APTEM (p&lt;0.01). CFT-EXTEM(®) and CFT-APTEM(®) were markedly prolonged by hypothermia at 30°C, 33°C, and 35°C (p&lt;0.01 for all except CFT-EXTEM, 35°C [p&lt;0.05]). The α-angle-EXTEM was markedly decreased at 30°C, 33°C, and 35°C (p&lt;0.01) but increased at 40°C (p&lt;0.05) and 42°C (p&lt;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.},
  author       = {Kander, Thomas and Brokopp, Jens and Friberg, Hans and Schött, Ulf},
  issn         = {2153-7933},
  language     = {eng},
  number       = {3},
  pages        = {125--130},
  publisher    = {Mary Ann Liebert, Inc.},
  series       = {Therapeutic hypothermia and temperature management},
  title        = {Wide Temperature Range Testing with ROTEM Coagulation Analyses.},
  url          = {http://dx.doi.org/10.1089/ther.2014.0005},
  volume       = {4},
  year         = {2014},
}