The effect of hetastarch 670/0.75 administered in vivo as a constant rate infusion on platelet closure time in the dog

Kim A. Helmbold, Matthew S. Mellema, Katrina Hopper, Steven E Epstein

Research output: Contribution to journalArticle

4 Scopus citations


MEASUREMENTS AND MAIN RESULTS: At 1 mL/kg/h, mean CT was significantly increased at the 12- and 24-hour time point relative to the baseline value, although mean CT never rose to a value above the reference interval during the 24-hour infusion. At 2 mL/kg/h, median CT was also significantly increased at the 12- and 24-hour time point relative to the baseline value. Administration of 2 mL/kg/h did progressively prolong the median CT value though only exceeded the reference interval at the 24-hour time point. Despite the prolongation of median CT, there was no clinical evidence of spontaneous bleeding in any dog during the 24-hour infusion at either CRI rate.

CONCLUSIONS: Hetastarch 670/0.75 when used as a 24-hour CRI at 1 and 2 mL/kg/h prolongs CT in healthy dogs at 6, 12, and 24 hours. Median CT only exceeded the reference interval at 24 hours at 2 mL/kg/h.

OBJECTIVE: To evaluate the effects of hetastarch 670/0.75 on canine platelet function and clinical bleeding following its administration as a constant rate infusion (CRI) at 1 mL/kg/h and 2 mL/kg/h for 24 hours.

DESIGN: In vivo, prospective, open-label, crossover study.

SETTING: Research laboratory at a university veterinary facility.

ANIMALS: Eight healthy, adult male research dogs.

INTERVENTIONS: Each dog received 1 mL/kg/h hetastarch for 24 hours then 2 mL/kg/h with a washout period of 10 weeks between each experiment. Platelet closure time (CT) was measured using a platelet function analyzer with collagen adenosine diphosphate (ADP) cartridges. CT measurements were performed at baseline and 6, 12, and 24 hours following initiation of hetastarch infusion.

Original languageEnglish (US)
Pages (from-to)381-387
Number of pages7
JournalJournal of veterinary emergency and critical care (San Antonio, Tex. : 2001)
Issue number4
StatePublished - Jul 1 2014
Externally publishedYes



  • coagulation
  • colloid
  • fluid therapy
  • hydroxyethyl starch
  • platelet function

ASJC Scopus subject areas

  • veterinary(all)

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