1.
Evidence-Based Minireview: Should warfarin or a direct oral anticoagulant be used in patients presenting with thrombosis in the splanchnic or cerebral veins?
Mathew, C, Zumberg, M
Hematology. American Society of Hematology. Education Program. 2021;(1):100-105
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Abstract
Case 1: A 23-year-old female third-year medical student who has no medical history seeks treatment for abdominal distention. She takes an estrogen-containing birth control pill and does not smoke or consume alcohol. Family history is unremarkable. Physical examination is significant for abdominal distention, and an abdominal fluid wave is detected. Complete blood count is normal. Imaging confirms occlusive thrombosis of the main portal vein. On endoscopy, grade 1 to 2 esophageal varices are noted and banded. Unfractionated heparin is begun. Subsequent workup reveals a homozygous factor V Leiden mutation. Long-term anticoagulation is planned, and she asks if warfarin can be avoided given her hectic ward rotations, erratic diet, and need for monitoring. Case 2: A 35-year-old woman who has no medical history seeks treatment for progressively worsening posterior headaches for 1 week. Magnetic resonance imaging of the brain shows dural sinus thrombosis with associated small areas of petechial cerebral hemorrhage. She is started on a continuous unfractionated heparin infusion and admitted to the hospital for further observation. Her grandmother is on warfarin for atrial fibrillation, and the patient would prefer to avoid warfarin because she does not think she can comply with the frequent monitoring that will be required. She inquires about other oral anticoagulant options for her condition.
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Evidence-Based Minireview: Are DOACs an alternative to vitamin K antagonists for treatment of venous thromboembolism in patients with MPN?
Schieppati, F, Falanga, A
Hematology. American Society of Hematology. Education Program. 2021;(1):448-452
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Overview of Current Evidence on the Impact of the Initial High Dose of the Direct Factor Xa Inhibitor Rivaroxaban on Thrombus Resolution in the Treatment of Venous Thromboembolism.
Bauersachs, R, Koitabashi, N
International heart journal. 2017;(1):6-15
Abstract
Incomplete thrombus resolution in patients with venous thromboembolism (VTE) may increase the risk of recurrent thromboembolic events and other complications, such as post-thrombotic syndrome. Various options exist for thrombus resolution, including systemic thrombolytic agents, catheter-directed thrombolysis, and traditional anticoagulants such as heparins or vitamin K antagonists (VKAs). Data are accumulating on the use of non-VKA oral anticoagulants, such as rivaroxaban, and these may provide greater thrombus resolution compared with VKAs. Data from the phase III rivaroxaban studies presented here show that a 21-day intensive dosing regimen of rivaroxaban 15 mg twice daily is effective during the acute treatment phase for VTE, with similar recurrence rates and thrombus resolution to standard anticoagulation. Pooled analyses of phase III studies have also indicated that rivaroxaban 20 mg once daily monotherapy for up to 12 months after this initial intensive treatment period may provide effective prevention of recurrent VTE and a reduction in the risk of major bleeding, irrespective of clot burden. Four case studies from the Darmstadt Academic Teaching Hospital, Germany, and Gunma University Hospital, Japan, are also provided. Further clinical studies and real-world data may improve our understanding of initial intensive dose regimens, and assess the full significance of thrombus burden in VTE.
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Fatal intracerebral bleeding under rivaroxaban.
Stöllberger, C, Bastovansky, A, Finsterer, J
International journal of cardiology. 2015;:110-2
Abstract
Rivaroxaban is a factor-Xa-inhibitor which has been shown to be non-inferior to the vitamin-K-antagonist (VKA) warfarin in atrial fibrillation patients. In the manufacturer-sponsored trial, the rate of intracranial hemorrhage in rivaroxaban-treated patients was lower than in VKA-treated. It is unknown if this advantage of rivaroxaban is also present outside clinical trials. We report a patient with fatal cerebral bleeding 4months after initiation of rivaroxaban. Bleeding might be favored by hypertension, hypoalbuminemia, renal impairment, hepatopathy and drug-drug interactions of rivaroxaban with amiodarone and bisoprolol. Patients have to be monitored closely after initiation of rivaroxaban, especially if they are treated with possibly interacting drugs. Additionally, hepatic function, albumin level, and renal function have to be closely monitored. Therapy with VKA seems more convenient, safer and more favorable for the patient than rivaroxaban with its associated uncertainties concerning metabolization and drug-drug interactions and no possibility to reverse its activity in emergency situations.