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In vitro evaluation of the effect of hypothermia on coagulation in dogs via thromboelastography

Authors

  • Ryan Taggart DVM,

    Corresponding author
    • Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Purdue University, West Lafayette, IN
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  • Brenda Austin DVM, MS, DACVS,

  • Eric Hans BS,

  • Daniel Hogan DVM, DACVIM


  • The authors declare no conflicts of interest.

Address correspondence and reprint requests to

Dr. Ryan Taggart, Lynn Hall 625 Harrison St, College of Veterinary Medicine, Purdue University, West Lafayette, IN 47907, USA.

Email: rtaggart@purdue.edu

Abstract

Objective

To evaluate the effect of temperature alterations on in vitro coagulation in healthy dogs using thromboelastography (TEG).

Design

In vitro study.

Setting

University teaching hospital.

Animals

Six healthy purpose-bred laboratory dogs.

Interventions

None.

Measurements and Main Results

Thromboelastograph tracings were created daily for all test subjects and used to generate control values for R, K, α, and MA. Control values were compared to test samples incubated at 42, 39, 36, 33, 30, and 27°C. At temperatures ≤ 30°C, a significant increase in K values and a significant decrease in the α values were noted. There were no significant differences detected for R and MA among any of the test temperatures.

Conclusions

Hypothermia results in in vitro coagulation changes in healthy dogs as determined by whole blood analysis using TEG. The data suggest that while clots may form more slowly at decreased temperatures, the ultimate strength of the clot appears unaffected.

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