1/7. Renal vein thrombosis in a newborn with prothrombotic genetic risk factors.Environmental and genetic risk factors interact to cause venous thromboembolism. Renal vein thrombosis in the newborn has been frequently associated with "risk factors" as catheters, surgery or trauma, but it has also been demonstrated a pathogenetic role of genetic prothrombotic risk factors, i.e. activated protein c resistance and FV Leiden. The treatment of neonatal venous thrombosis varies worldwide and different approaches have been proposed. We present a case of renal vein thrombosis in a female newborn with normal plasma levels of protein C, protein s and antithrombin iii, but with her genotype characterized by the presence of three prothrombotic risk factors: factor v Leiden, methylentetrahydrofolate reductase and platelet glycoprotein IIIa polymorphisms. The treatment with recombinant tissue plasminogen determined complete thrombus dissolution.- - - - - - - - - - ranking = 1keywords = thromboembolism (Clic here for more details about this article) |
2/7. Coexistence of factor v G1691A and factor II G20210A gene mutations in a thrombotic family is associated with recurrence and early onset of venous thrombosis.Two G-to-A mutations at positions 1691 of the factor v (FV) gene and 20210 of the prothrombin (FII) gene have been associated with an increased risk of venous thromboembolism. We report a thrombosis-prone family in which one subject--the propositus who exhibited combined heterozygous FV G1691A and FII G20210A mutations--showed spontaneous and early clinical onset (at 23 years), recurrences of deep-vein thrombosis and pulmonary embolism. His asymptomatic father carried the FII G20210A substitution and his mother, characterized by an isolated thrombotic episode on occasion of surgery (at 48 years), carried the FV G1691A substitution. In the maternal lineage, one of the propositus' uncles had thrombosis on occasion of a bone fracture (at 65 years) despite the absence of known prothrombotic defects. A sister of the propositus carried the FII G20210A and the brother the FV G1691A mutation. They have been asymptomatic until now. The propositus' two children, 20 and 16 years old, both carry the FV G1691A substitution and have been asymptomatic until now. The plasma levels of FII were higher in carriers of the FII G20210A allele if compared with noncarriers, and the activated protein c resistance phenotype, associated with the FV Leiden mutation, showed a complete correlation with the FV G1691A mutation. Despite the very limited number of thrombotic cases involved in this survey, which does not allow statistically sound conclusions, the data obtained from this family suggest that the synergy of inherited factors and transient risk conditions could play a key role in the occurrence of thrombotic accidents.- - - - - - - - - - ranking = 1keywords = thromboembolism (Clic here for more details about this article) |
3/7. Homozygous antithrombin deficiency type II (99 Leu to Phe mutation) and childhood thromboembolism.We report 5 children from 3 families with homozygous antithrombin deficiency type II affecting the heparin binding site (99 Leu to Phe mutation). Four children had severe spontaneous thromboembolic events (deep leg or caval vein thrombosis, ischaemic stroke) at one week, 3 months, 13 and 14 years of age. The fifth patient, a 17 year-old boy was asymptomatic. Early manifestation of homozygous deficiency calls for prompt and accurate diagnosis. In doubtful cases genetic analysis is required. Long-term oral anticoagulation should be considered in affected individuals.- - - - - - - - - - ranking = 4keywords = thromboembolism (Clic here for more details about this article) |
4/7. Recurrent thromboembolism in a patient with beta-thalassemia major associated with double heterozygosity for factor v R506Q and prothrombin G20210A mutations.Double heterozygosity for factor v R506Q and prothrombin G20210A mutations was identified in a 24-year-old man with beta-thalassemia major. The patient experienced a first thrombotic event at the age of 19 years and three recurrent thromboses in a short time interval, the third occurring while the patient was receiving long-term anticoagulant treatment. This case suggests that patients with major thalassemia and congenital thrombophilic mutations need intensive and long-lasting anticoagulant treatment. Thus, even if thrombotic events could be explained by a hypercoagulable state observed in patients with major thalassemia, after a first thrombotic event has occurred these patients should be screened for acquired and congenital thrombophilia.- - - - - - - - - - ranking = 4keywords = thromboembolism (Clic here for more details about this article) |
5/7. Homozygous and double heterozygous factor v Leiden and Factor II G20210A genotypes predispose infants to thromboembolism but are not associated with an increase of foetal loss.Prospective and controlled data about the individual risk profile in asymptomatic children with homozygous or double heterozygous risk genotypes for factor v Leiden (FVL) and factor II (FII) G20210A are currently unavailable. The systematic and prospective observational study presented here was designed to determine the impact of the homozygous and double heterozygous FVL and FII G20210A genotypes on the prenatal and postnatal risk profiles of affected children. Risk infants and heterozygous controls were identified by screening of 85,304 neonates. Follow-up included the comparison of prenatal and postnatal development, ultrasonography of brain and kidneys, and a panel of independent determinants of thrombophilia. The numbers of identified or expected FVL homozygotes and double heterozygotes did not differ significantly (FVL: 116 versus 91, p=0.08; FVL/FII: 94 versus 76, p=0.17), indicating the absence of a prenatal disadvantage. A prenatal advantage was suggested in FII homozygotes, whose identified number far exceeded the expected (19 versus 4, p=0.002). Clinical and/or imaging abnormalities indicated spontaneous thromboembolic events in 4 of 129 risk infants (3%) but in none of the 178 controls (p=0.02). Physical and neurological development was normal in both groups during the first 2 years of life. The risk genotypes appear to confer a significant predisposition for spontaneous thromboembolic events in infancy without impeding development within the first two years of life. Foetal risk genotypes do not cause an increased foetal loss rate. Moreover, homozygous FII G20210A appears to be associated with a prenatal advantage.- - - - - - - - - - ranking = 4keywords = thromboembolism (Clic here for more details about this article) |
6/7. Risk-factor profile in severe, generalized, obliterating vascular disease.A 74-year-old woman had a history over 25 years of endarterectomy of both renal arteries, iliac venous thrombosis, pulmonary embolism, left internal carotid artery endarterectomy, coronary angioplasty, aortocoronary bypass grafting, occlusion of the right axillary artery, lower-limb claudication due to common iliac artery aneurysm, external iliac artery stenosis, multiple femoral artery stenoses, bifurcational stent grafting, occlusion of the left brachial artery and the right external iliac artery, and stroke. Assessment of the risk-factor profile revealed an absence of classic risk factors but the presence of the factor v Leiden mutation, the methylenetetrahydrofolate reductase AI298C mutation, the HFE C282Y mutation, plasminogen activator inhibitor-1 gene mutation, the -455 G/A fibrinogen gene polymorphism, the epsilon3/epsilon4 apolipoprotein E -675 4G gene polymorphism, and hyperhomocysteinemia. This case shows that severe, generalized, occlusive vascular disease may be due to the combination of various genetic risk factors for atherosclerosis and venous thromboembolism.- - - - - - - - - - ranking = 1keywords = thromboembolism (Clic here for more details about this article) |
7/7. Combined thrombophilic risk factors and essential thrombocythemia in patient with recurrent venous thromboembolic episodes-thirty-three-year follow-up.We present the case of a 64 year-old female patient, with a clearly positive family history of venous thromboembolism (VTE), multiple VTE episodes (massive pulmonary embolism, ovarian venous plexus thrombosis, deep venous thrombosis with submassive pulmonary embolism and second deep venous thrombosis) and myocardial infarction.Laboratory tests revealed the resistance to the activated protein C, elevated FVIII and PAI-1. The patient was found to be a heterozygous carrier of FV Leiden, MTHFR C677T and PAI-1 4G/5G mutations. She was diagnosed with essential thrombocythemia at the age of 60.The thirty-three-year follow-up of our patient and detection of recurrent thrombotic episodes in the light of multiple coagulation defects with proved acquired risk factors, contributes to the risk stratification in the group of patients with very high risk. In case of our patient, we stress inadequacy of widely-accepted standard prevention measures. In our opinion, patients with very high risk require additional mechanic and specific medicament methods of VTE prevention.- - - - - - - - - - ranking = 1keywords = thromboembolism (Clic here for more details about this article) |