Summary
It has been established that inflammation and enhanced procoagulant activity are associated
with the pathogenesis of atherosclerotic vascular disease. We evaluated and compared
the contributions of the factor (F)XIa and tissue factor (TF) activity in plasma of
patients with coronary artery disease (CAD). Citrate plasma was obtained prior to
therapy from 53 patients with stable angina (29 with a history of previous myocardial
infarction; CAD-MI) and 30 with acute coronary syndrome (ACS) within 12 hours from
pain onset. Four ACS patients treated with heparin were excluded. FXIa andTF activity
were determined in clotting assays based upon the prolongation of clotting time by
inhibitory monoclonal antibodies. Twenty-five of 26ACS patients (96%) and 22 of 29
CAD-MI patients (76%) had quantifiable FXIa (50 ± 33 and 42 ± 45pM, respectively).Ten
of 26 (38%) ACS patients and only three of 53 (6%) stable CAD patients showedTF activity
(<0.4pM). No FXIa or TF activity was observed in agematched healthy controls (n=12).For
both CAD-MI andACS patients, there were correlations (p<0.05) between FXIa and interleukin-6
(R2= 0.59 and 0.39, respectively) and between FXIa and TAT (R2= 0.64 and 0.63, respectively). In conclusion, the majority of ACS and CAD-MI patients
have circulating FXIa that correlates with markers of coagulation and inflammation.
Keywords
Coronary artery disease - factor XIa - tissue factor - inflammation markers - coagulation
markers