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The effect of hetastarch 670/0.75 administered in vivo as a constant rate infusion on platelet closure time in the dog
Author(s) -
Helmbold Kim A.,
Mellema Matthew S.,
Hopper Kate,
Epstein Steven E.
Publication year - 2014
Publication title -
journal of veterinary emergency and critical care
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.886
H-Index - 47
eISSN - 1476-4431
pISSN - 1479-3261
DOI - 10.1111/vec.12209
Subject(s) - medicine , hetastarch , anesthesia , platelet , crossover study , bleeding time , washout , hemostasis , urology , surgery , platelet aggregation , resuscitation , placebo , pathology , alternative medicine
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. 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.