title: DDAVP-induced increases in coagulation factor VIII and von Willebrand factor in the plasma of conscious dogs.
abstract: Infusion of the vasopressin analogue DDAVP into five normal dogs at doses of 0.1-2.0 micrograms DDAVP per kg body weight induced dose-dependent increases in the plasma content of coagulation factor VIII and von Willebrand factor. Plasma concentrations of von Willebrand factor (determined antigenically as factor VIII-related antigen and functionally as coagglutinin cofactor activity) and coagulation factor VIII were measured immediately before and at 10, 30, and 120 min after 10-min intravenous infusions of DDAVP. The greatest increases in coagulation factor VIII were produced with the 2.0 micrograms/kg dose. Ten minutes after infusion the mean increase in coagulation factor VIII was 32 units/dl (concentrations of all indices were reported relative to concentrations in a standard canine plasma pool, arbitrarily assigned a concentration of 100 units/dl) and this increase did not change significantly throughout the duration of the experiment. At 10 min post-infusion, the mean factor VIII-related antigen concentration increased 81 units/dl (dose = 2.0 micrograms/kg) and did not change significantly for the duration of the experiment. The maximum mean increase in coagglutinin cofactor activity, 141 units/dl, occurred 10 min after infusion (dose = 1.0 microgram/kg). Coagglutinin cofactor activity decreased significantly from peak activity by 120 min post-infusion.
mesh_terms: D000818:Animals; D003894:Deamino Arginine Vasopressin / Q000494:pharmacology*; D004285:Dogs; D005169:Factor VIII / Q000378:metabolism*; D005260:Female; D007700:Kinetics; D008297:Male; D010052:Ovariectomy; D014841:von Willebrand Factor / Q000378:metabolism*
chemical_list: D014841:von Willebrand Factor; D005169:Factor VIII; D003894:Deamino Arginine Vasopressin