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Comparative Study
Journal Article
Prevalence of factor V Leiden and prothrombin 20210 A variant in Bulgarian patients with pulmonary thromboembolism and deep venous thrombosis.
Blood Coagulation & Fibrinolysis : An International Journal in Haemostasis and Thrombosis 2001 December
Factor V Leiden mutation and prothrombin variant 20210 A are well-known risk factors for venous thrombosis (DVT). Recent papers have reported a lower prevalence of factor V Leiden in patients with pulmonary thromboembolism (PTE) than in patients with deep venous thrombosis. The aim of the present study was to compare the prevalence of factor V Leiden and the prothrombin 20210 G <-- A mutation in patients with DVT and in patients with PTE. We studied 128 consecutive patients (45 with DVT, 40 with PTE, and 43 with DVT and PTE) for factor V Leiden and prothrombin 20210 A. One hundred healthy persons matched by age and sex were used as controls. Factor V Leiden was present in five of the patients with PTE [12.5%; 95% confidence interval (CI), 1.5-23.5%; not significant], 15 of the patients with DVT (33.3%; 95% CI, 9.6-38.7%; P < 0.001), and 12 of the patients with DVT and PTE (27.9%; 95% CI, 4.8-33%; P = 0.001). Results for the prothrombin 20210 A mutation were as follows: four of 40 patients with PTE (10%; 95% CI, 0-13.3%; P = 0.46), nine of 45 (20%) of the patients with DVT (95% CI, 0.5-25.5%; P < 0.05) and eight of 43 with DVT and PTE were heterozygous (18.6%; 95% CI, 0-23.9%; P = 0.02). In conclusion, there is a significantly higher frequency of factor V Leiden among patients with DVT than in patients with PTE. However, there is no significant difference of factor V Leiden or 20210 A prothrombin mutation in patients with DVT than in patients with combined DVT/PTE, therefore patients with DVT, carriers of the mutations, do not appear to be at lower risk for pulmonary embolism.
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