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Thrombotic events in severe FXII deficiency in comparison with unaffected family members during a long observation period
AbstractTo investigate the occurrence of thrombotic events (myocardial infarction, deep vein thrombosis or ischemic stroke) in a group of 39 cases of severe FXII deficiency during a mean 22.5  years follow-up. All patients seen in Padua during the years 1968–2006 will the object of this investigation. FXII was less than or 1% of normal in all cases. Factor FXII activity in unaffected family members was 98% (range 90–140%). No patient or control had a thrombotic event in the past and none were on anticoagulant therapy. FV Leiden was present in one patient and in two controls whereas the G to A20210 prothrombin polymorp...
Source: Journal of Thrombosis and Thrombolysis - January 29, 2019 Category: Hematology Source Type: research

Drug interactions and pharmacogenetic factors contribute to variation in apixaban concentration in atrial fibrillation patients in routine care
In this study, we assessed the impact of interacting medication and pharmacogenetic variation to better explain apixaban concentration differences among 358 Caucasian AF patients. Genotyping (ABCG2,ABCB1,CYP3A4*22,CYP3A5*3) was performed by TaqMan assays, and apixaban quantified by mass spectrometry. The typical patient was on average 77.2  years old, 85.5 kg, and had a serum creatinine of 103.1 µmol/L. Concomitant amiodarone, an antiarrhythmic agent and moderate CYP3A/ABCB1 inhibitor, the impaired-function variantABCG2 c.421C  >  A, and sex predicted higher apixaban concentrations when controlling for age, weig...
Source: Journal of Thrombosis and Thrombolysis - January 18, 2020 Category: Hematology Source Type: research