title: Prevalence of factor V Leiden and prothrombin 20210 A variant in Bulgarian patients with pulmonary thromboembolism and deep venous thrombosis.
abstract: 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.
authors.affiliation: Clinical Center of Allergology, Medical University, Sofia, Bulgaria. bbboya2@pop.uky.edu
authors.forename: B
authors.initials: B
authors.lastname: Boyanovsky
authors.forename: M
authors.initials: M
authors.lastname: Russeva
authors.forename: V
authors.initials: V
authors.lastname: Ganev
authors.forename: M
authors.initials: M
authors.lastname: Penev
authors.forename: M
authors.initials: M
authors.lastname: Baleva
authors.forename: M
authors.initials: M
authors.lastname: Russev
mesh_terms: D000328:Adult; D000368:Aged; D002031:Bulgaria / Q000453:epidemiology; D016022:Case-Control Studies; D005165:Factor V / Q000235:genetics*; D005260:Female; D005820:Genetic Testing; D014644:Genetic Variation; D006579:Heterozygote; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation; D015995:Prevalence; D011516:Prothrombin / Q000235:genetics*; D011655:Pulmonary Embolism / Q000453:epidemiology / Q000235:genetics*; D012307:Risk Factors; D020246:Venous Thrombosis / Q000453:epidemiology / Q000235:genetics*
chemical_list: C095381:factor V Leiden; D005165:Factor V; D011516:Prothrombin