A novel ultrasound-based method to evaluate hemostatic function of whole blood.
BACKGROUND
Unregulated hemostasis represents a leading cause of mortality and morbidity in the developed world. Being able to recognize and quantify defects of the hemostatic process is critical to reduce mortality and implement appropriate treatment.


METHODS
We describe a novel ultrasound-based technology, named sonorheometry, which can assess hemostasis function from a small sample of blood. Sonorheometry uses the phenomenon of acoustic radiation force to measure the dynamic changes in blood viscoelasticity during clot formation and clot dissolution. We performed in vitro experiments using whole blood samples of 1 ml to demonstrate that sonorheometry is indicative of hemostatic functions that depend on plasma coagulation factors, platelets, and plasma fibrinolytic factors.


RESULTS
Sonorheometry measurements show titration effects to compounds known to alter the coagulation factors (GPRP peptide, 0 to 8 mmol/l), platelets (abciximab, 0 to 12 microg/ml), and fibrinolytic factors (urokinase, 0 to 200 U). Repeated measurements of blood samples from the same subjects yielded reproducibility errors on the order of 5%.


CONCLUSIONS
These data indicate that sonorheometry accurately quantifies the functional role of the components of hemostasis in vitro.
Department of Biomedical Engineering, University of Virginia, 415 Lane Rd., Charlottesville, VA 29908, USA. fv7d@virginia.edu
Francesco
F
Viola
F William
FW
Mauldin
Xiefan
X
Lin-Schmidt
Doris M
DM
Haverstick
Michael B
MB
Lawrence
William F
WF
Walker
D001769:Blood; D001779:Blood Coagulation Factors / Q000032:analysis; D001792:Blood Platelets / Q000166:cytology; D005342:Fibrinolysis; D006487:Hemostasis; D006801:Humans; D015203:Reproducibility of Results; D012212:Rheology; D014465:Ultrasonics; D014783:Viscosity
D001779:Blood Coagulation Factors