PT  - JOURNAL ARTICLE
AU  - Marie Hudson
AU  - Andrée-Laure Herr
AU  - Joyce Rauch
AU  - Carolyn Neville
AU  - Erika Chang
AU  - Reda Ibrahim
AU  - Chantal Séguin
AU  - Jeannine Kassis
AU  - Lambert Busque
AU  - Paul R Fortin
TI  - The presence of multiple prothrombotic risk factors is associated with a higher risk of thrombosis in individuals with anticardiolipin antibodies.
DP  - 2003 Nov 01
TA  - The Journal of Rheumatology
PG  - 2385--2391
VI  - 30
IP  - 11
4099  - http://www.jrheum.org/content/30/11/2385.short
4100  - http://www.jrheum.org/content/30/11/2385.full
SO  - J Rheumatol2003 Nov 01; 30
AB  - OBJECTIVE: To explore the effect of multiple prothrombotic risk factors in individuals with anticardiolipin antibodies (aCL), we evaluated immunologic, coagulation, and genetic prothrombotic abnormalities in a cohort of individuals with different aCL titers. METHODS: We recruited 87 individuals into 4 categories (normal, low, intermediate, or high) based on their baseline IgG aCL (aCL-IgG) titers. We measured at followup: repeat aCL-IgG, IgM aCL (aCL-IgM), antibodies to beta2-glycoprotein I (anti-beta2-GPI), lupus anticoagulant (LAC) antibodies, protein C, protein S, activated protein C resistance, factor V506 Leiden mutation, methyl tetrahydrofolate reductase (MTHFR) C677T genotype, and prothrombin 20210A gene mutation. Thrombotic events were confirmed. RESULTS: At recruitment, 20 individuals were negative for aCL-IgG and 67 were positive (22 low, 20 intermediate, and 25 high titer). Twenty of the 87 participants had experienced a previous thrombotic event: 4 in the aCL-IgG negative group and 16 in the aCL-IgG positive group. Among the 87 individuals, the number of those with concomitant prothrombotic risk factors was as follows: 5 had no other prothrombotic risk factors, 32 had 1 risk factor, 24 had 2 risk factors, 10 had 3 risk factors, 10 had 4 risk factors, and 6 had 5 risk factors. Thrombotic events were observed in 20%, 13%, 33%, 10%, 30%, and 50% of these groups, respectively, and the odds ratio associated with a previous thrombotic event was 1.46 per each additional prothrombotic risk factor (95% confidence interval: 1.003-2.134). CONCLUSION: In individuals with positive aCL-IgG, we observed an association between the number of prothrombotic risk factors and history of thrombotic events.