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. 1987 Apr;51(2):189–193.

The effects of desmopressin on plasma factor VIII/von Willebrand factor activity in dogs with von Willebrand's disease.

I B Johnstone, S Crane
PMCID: PMC1255301  PMID: 3111674

Abstract

Eight unanesthetized normal dogs and seven dogs with von Willebrand's disease (vWD) were given desmopressin (0.6 micrograms/kg, IV) in order to determine the effects of this drug on plasma Factor VIII/vWF activity. Seven of the normal dogs and four of the vWD dogs were administered an equal volume of saline (control infusion) on another occasion. The other three vWD dogs underwent major surgery after treatment with desmopressin. Plasma FVIII coagulant activity (FVIII:C), von Willebrand factor antigen (vWF:Ag), and FVIII-ristocetin co-factor activity (FVIII:RC) were quantitated before infusion and at 60 minutes postinfusion. Activities were expressed as a percentage of the activity of a pooled canine plasma (12 dogs) arbitrarily designated as having 100% FVIII:C, vWF:Ag, and FVIII:RC activity. Plasma FVIII:C activity increased by 28% in the normal dogs and by 37% in the dogs with vWD. Plasma vWF:Ag increased more than twofold in normal dogs after desmopressin treatment. In the vWD dogs the average increase was also twofold, however there was much greater variability between dogs with increases ranging from 1.2 fold to 2.4 fold. Plasma FVIII:RC activity almost doubled in normal dogs, however like vWF:Ag, the increases in vWD dogs were more variable. One vWD dog had no increase in FVIII:RC while in the remaining six dogs FVIII:RC increases ranged from 1.8 to 2.9 fold. The results of this study indicate that a single intravenous dose of desmopressin (0.6 micrograms/kg) causes a significant elevation in plasma vWF:Ag and FVIII:RC activity and a much lesser increase in FVIII:C activity in normal unanesthetized dogs.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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