Summary
Plasma levels of fibrin D-dimer, tissue plasminogen activator (tPA) and plasminogen
activator inhibitor (PAI) have been associated with ischaemic heart disease (IHD).
However their associations with incident IHD in samples of the general population
are not established. D-dimer antigen, tPA antigen and PAI activity were measured in
stored, fasting plasma samples from 1,998 men aged 45-65 examined between 1984 and
1988, during the first re-examination of the Caerphilly Study cohort. These variables
were related to major IHD events (myocardial infarction or IHD death) which occurred
in 129 men during a follow-up period which averaged 61 months. Mean fibrin D-dimer
was higher in men who developed IHD events (90 vs. 71 ng/ml; age-adjusted logarithmic
mean difference 0.21; 95% CI 0.11, 0.30; p <0.0001). This association remained after
adjusting for baseline IHD and for other risk factors including fibrinogen: the adjusted
relative odds of IHD in the highest fifth of D-dimer were 3.5 (95% CI 1.8, 6.9; p
= 0.0003). Mean tPA antigen was also higher in men who developed IHD (12.6 vs. 11.6
ng/ml; mean difference 0.9; 95% CI 0.2, 1.7; p = 0.02); however this difference largely
disappeared after adjusting for other risk factors. PAI activity was not associated
with risk of IHD.