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Hemostasis and the complement system in Argentine hemorrhagic fever
F C Molinas1, M M de Bracco, J I Maiztegui
1Instituto de Investigaciones Médicas Alfredo Lanari, Faculty of Medicine, University of Buenos Aires, Argentina.
Reviews of Infectious Diseases
|May 1, 1989
Summary
Argentine hemorrhagic fever (AHF) causes blood clotting abnormalities, including low platelets and altered clotting factors, but not disseminated intravascular coagulation (DIC). Complement system activation was also observed during the acute phase.
Area of Science:
- Hematology
- Immunology
- Infectious Diseases
Background:
- Argentine hemorrhagic fever (AHF) is a severe viral illness.
- Understanding its hemostatic and complement system disturbances is crucial for patient management.
Purpose of the Study:
- To investigate the specific abnormalities in blood coagulation and complement activation during the acute phase of AHF.
- To determine if disseminated intravascular coagulation (DIC) is responsible for the observed hemostatic derangements.
- To explore potential animal models for studying AHF.
Main Methods:
- Analysis of coagulation parameters including platelet count, activated partial thromboplastin time, Factor VIII:C, and von Willebrand factor.
- Assessment of complement system components (C1q, C2, C3, C4, C5) and their degradation products.
- Development and evaluation of animal models (guinea pigs, Callitrix jacchus) for AHF.
Main Results:
- Patients exhibited thrombocytopenia, prolonged activated partial thromboplastin time, low Factor VIII:C with high von Willebrand factor, and elevated Factor V.
- No evidence of DIC was found, indicating AHF's hemostatic issues are not DIC-related.
- Complement activation was evident, with reduced total complement and C2 activity, low C1q, C3, C5, and high C4, along with C3 and B degradation products.
- Animal models partially replicated human coagulation and complement abnormalities.
Conclusions:
- The hemostatic abnormalities in AHF are distinct from DIC.
- Complement activation plays a significant role in the acute phase of AHF.
- Existing animal models offer limited but potentially useful insights into AHF pathophysiology.