[Disseminated intravascular coagulation induced by endotoxin in rabbits: effect of treatment with t-PA and urokinase].
OBJECTIVE
To assess the therapeutic efficacy of agents capable of stimulating the fibrinolytic system, such as tissue plasminogen activator (t-PA) and urokinase (UK) on endotoxin-induced disseminated intravascular coagulation (DIC) in the rabbit.


METHODS
DIC was induced by intravenous administration of endotoxin, 20 micrograms/kg/hr during 6 hr. Four different groups were established: a) control group, receiving only saline solution; b) t-PA group receiving 0.2 mg/kg; c) t-PA group receiving 0.7 mg/kg, and d) UK group, which was given 3,000 IU/kg/hr for 6 hr. Blood samples were drawn before and after 2 hr and 6 hr of endotoxin administration. Platelet count, and fibrinogen, factor XII and antithrombin III concentrations, were assessed in each sample. Mean, standard deviation and percentage of increase or decrease with respect to the basal value, this considered 100%, were used to evaluate the findings. For comparison of values, Student's t and Mann Whitney's U were used; the Fisher test was used for mortality studies.


RESULTS
No statistical differences appeared for any of the values in the rabbits under basal conditions. The rabbits in the control group developed DIC. No doses of t-PA modified the changes appearing in blood coagulation. UK reduced the fibrinogen and factor XII consumption induced by endotoxin. The mortality rate in the control group reached 70%. High-dose t-PA decreased such figure to 50%, while low-dose t-PA or UK failed to reduce mortality.


CONCLUSIONS
High-dose t-PA has beneficial effects on endotoxin-induced DIC in rabbits. UK failed to achieve such effect at the doses given in this experimental DIC model.
Paloma
M J
MJ
Servicio de Hematología, Clínica Universitaria, Facultad de Medicina, Universidad de Navarra, Pamplona.
Páramo
J A
JA
Rifón
J
J
Rocha
E
E
D000818:Animals; D000990:Antithrombin III / Q000032:analysis; D004211:Disseminated Intravascular Coagulation / Q000097:blood / Q000139:chemically induced / Q000188:drug therapy*; D004731:Endotoxins / Q000633:toxicity*; D005174:Factor XII / Q000032:analysis; D005340:Fibrinogen / Q000032:analysis; D010976:Platelet Count / Q000187:drug effects; D011817:Rabbits; D010959:Tissue Plasminogen Activator / Q000008:administration & dosage / Q000627:therapeutic use*; D014568:Urokinase-Type Plasminogen Activator / Q000008:administration & dosage / Q000627:therapeutic use*
D004731:Endotoxins; C044101:endotoxin, Escherichia coli; D000990:Antithrombin III; D005174:Factor XII; D005340:Fibrinogen; D010959:Tissue Plasminogen Activator; D014568:Urokinase-Type Plasminogen Activator
Coagulación intravascular diseminada inducida por endotoxina en conejos: efecto del tratamiento con t-PA y uroquinasa.