Abstract

Background: Some studies suggest that increased homocystein in blood leads to alterations in coagulation; however, the precise mechanism is not clear. The aim of this study was to compare different concentrations of homocysteine and aspirin on coagulation parameters and permeability coefficient of clot in the plasma of healthy individuals in vitro. Methods: Different concentrations of homocysteine (50, 100, 200 µM) and aspirin (1, 10, 100 mg/l) were added to the plasma citrate. They were incubated at 37°C for 24 hours. Then, coagulation parameters were analyzed by the turbidimetric procedure at 405 nm and permeability coefficient of clot was determined. The independent samples t-test was utilized to compare the results. Findings: Homocysteine at 200 µM with aspirin 100 mg/l had significant changes in the total coagulation time (820.00 ± 1.15 s), maximum coagulation velocity (0.232 ± 0.003), the permeability coefficient of clot (1.108 x 10-6) ± 0.151 compared to homocysteine at 200 µM 555.00 ± 12.89, 0.258 ± 0.008, (0.493 x 10-6) ± 0.038, respectively (P < 0.05). Homocysteine at 200 µM with aspirin 1 mg/l did not significantly change in either parameter (P > 0.05). Homocysteine at 100 µM with aspirin 1 mg/l significantly changed only in the permeability coefficient (0.787 x 10-6) ± 0.071 compared to homocysteine at 100 µM (0.636 x 10-6) ± 0.053 (P < 0.05). Conclusion: Aspirin with the dose more than 1 mg/l had more effect on higher concentrations of homocysteine and delayed forming clot by impeding the coagulation. It increased clot permeability, too. © 2014, Isfahan University of Medical Sciences(IUMS). All rights reserved.