Influence of anticoagulant therapy with vitamin K antagonists on plasma levels of coagulation factor VIII.
Vitamin K-antagonists (VKA) decreases vitamin K coagulation factors. To counterbalance this effect, it has been postulated that non-vitamin K proteins increase during VKA treatment. To investigate if VKA affect FVIII, a cohort of 1772 patients referred from Jan 1997 to Oct 2008 to our Thrombosis Center for a thrombophilia screening after at least 3 months from diagnosis of first venous thrombosis was studied. At the time of blood sampling, 1303 patients had discontinued VKA for at least one month, whereas the remaining 469 were still taking VKA. FVIII was significantly higher in patients on VKA than in those who had discontinued VKA (mean+/-SD: 144+/-41 IU/dL and 134+/-40 IU/dL, respectively, p<0.0001), also after adjustment for sex, age, body mass index, thrombophilia and time elapsed from thrombosis in a multiple linear regression analysis. In order to avoid overestimation of FVIII levels, patients should be preferentially tested after VKA discontinuation.
Angelo Bianchi Bonomi Hemophilia and Thrombosis Centre, Department of Internal Medicine and Medical Specialties, IRCCS Maggiore Hospital, Mangiagalli and Regina Elena Foundation and University of Milan, Italy.
Serena Maria
SM
Passamonti
Paolo
P
Bucciarelli
Rossella
R
Bader
Ida
I
Martinelli
D000328:Adult; D000925:Anticoagulants / Q000008:administration & dosage*; D015415:Biomarkers / Q000097:blood; D001777:Blood Coagulation / Q000187:drug effects*; D001780:Blood Coagulation Tests; D016009:Chi-Square Distribution; D004334:Drug Administration Schedule; D005169:Factor VIII / Q000378:metabolism*; D005260:Female; D006801:Humans; D007558:Italy; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D018570:Risk Assessment; D012307:Risk Factors; D013997:Time Factors; D016896:Treatment Outcome; D020246:Venous Thrombosis / Q000097:blood / Q000188:drug therapy*; D014812:Vitamin K / Q000037:antagonists & inhibitors*
D000925:Anticoagulants; D015415:Biomarkers; D014812:Vitamin K; D005169:Factor VIII