XENITH: Rivaroxaban for Pulmonary Embolism Managed With Catheter Directed Thrombolysis
试验速览
- 阶段
- 4 期
- 状态
- 终止
- 发起方
- 入组人数
- 10
- 主要终点
- Change in Markers of NETosis at 12h Compared to Baseline
研究概览
简要总结
The trial is an open-label, randomized, trial examining novel biomarkers of thrombosis in patients managed with rivaroxaban vs. standard care following treatment of pulmonary embolism (PE) with catheter-guided alteplase. Patients >18 years old who present with PE and are managed with catheter-guided alteplase will be screened for study inclusion. Patient's meeting inclusion/exclusion criteria will undergo informed consent. Immediately following completion of alteplase infusion, patients will be randomized to receipt of rivaroxaban 15 mg oral bid for 21 days followed by 20mg oral daily or continuation on unfractioned heparin or low-molecular weight heparin with initiation of warfarin adjusted to INR of 2-3. Blood samples will be taken within 2 hours of CDT completion prior to receipt of study treatment (study day 1), at 8h-12h, 24h, 48h, 5d (or prior to hospital discharge), and at 30 day follow-up. Clinical endpoints, including bleeding, evidence of thrombosis progression, and death will be tracked during index hospitalization and at follow-up 30 days post-discharge.
详细描述
Catheter-guided alteplase has a growing role in the management of acute pulmonary embolism (PE). Following a 12-24 hour alteplase infusion (for bilateral or unilateral PE, respectively) patients are routinely managed with therapeutic unfractionated heparin (UFH) as a bridge to chronic warfarin therapy. It is our desire to study the effects of rivaroxaban vs. standard care following catheter-guided alteplase thrombolytic therapy (CDT) in patients with acute pulmonary embolism. Use of rivaroxaban may offer several important advantages compared to standard therapy in this setting. Among these is the potential for rivaroxaban to improve novel biomarkers of thrombosis including inhibition neutrophil extracellular traps (NETs), tissue factor-positive microparticles, and markers of inflammation. Neutrophil release of extracellular DNA may provide a scaffold upon which venous thrombosis propagates. NETs are associated with thrombus organization. Their dissolution may facilitate thrombolysis. Circulating DNA, a surrogate marker for NETs, is elevated 2-3 fold in patients with venous thromboembolism (VTE) and correlates strongly with plasma myeloperoxidase (MPO), an inflammatory marker of neutrophil and monocyte activation. The investigators have previously demonstrated that heparin can trigger MPO release from leukocytes. Thus, it is resonable to speculate that anti-Xa therapy may reduce inflammation, MPO, and NET levels in circulation. Further, the investigators have observed that catheter-directed thrombolysis may increase length of stay (time frame = 8 hours to 30 days following administration of study drugs) and the investigators would also propose treatment with rivaroxaban may balance this by eliminating a "bridging" period.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Provisions of informed consent prior to any study specific procedure
- •Diagnosis of acute PE
- •Evidence of RV strain as defined by one of the following:
- •an RV-to-LV diameter ratio>0.9
- •elevated troponin
- •elevated BNP
- •Plan for CDT for PE.
排除标准
- •Arterial hypotension and cardiogenic shock at the time of enrollment. Arterial hypotension defined as a systolic arterial pressure <90mm Hg or a drop in systolic arterial pressure of at least 40 mm Hg for at least 15 minutes with tissue hypoperfusion and/or hypoxia)
- •Hypersensitivity or other reaction to rivaroxaban
- •Other indication for VKA than PE
- •Creatinine clearance <30 ml/min
- •Significant liver disease (e.g. acute hepatitis, chronic active hepatitis, cirrhosis) or ALT > 3 x ULN
- •Life expectancy <3 months
研究组 & 干预措施
rivaroxaban
For the first 3 weeks, patients will receive rivaroxaban 15mg twice-daily; thereafter they will take rivaroxaban 20mg once-daily as per the drug label. Rivaroxaban will be initiated immediately following completion of alterplase infusion, and heparin will be discontinued at the time of rivaroxaban administration.
干预措施: rivaroxaban (Drug)
heparin-warfarin
Unfractioned heparin (UFH), following hospital protocol to achieve a target PTT or enoxaparin, 1.0mg/kg twice-daily, for a minimal duration of treatment of 5 days. Warfarin may be started on the night after CDT. UFH or enoxaparin should continue until the INR is >= 2.0 on two consecutive measurements at least 24 hours apart with an advised overlap with VKA for 4 to 5 days. VKA dosages will be adjusted to maintain the INR within the therapeutic range (target 2.5, range 2.0 - 3.0).
干预措施: warfarin (Drug)
结局指标
主要结局
Change in Markers of NETosis at 12h Compared to Baseline
时间窗: 12h
Change in Markers of NETosis at 12h Compared to Baseline
Change in Markers of NETosis at 24h Compared to Baseline
时间窗: 24h
Values will be reported in comparison to baseline in the two treatment groups.
Change in Markers of NETosis at 48h Compared to Baseline
时间窗: 48h
Values will be reported in comparison to baseline in the two treatment groups.
Change in Markers of NETosis at 5 Days (or Day of Hospital Discharge) Compared to Baseline
时间窗: 5 days (or day of hospital discharge)
Change in Markers of NETosis at 5 days (or day of hospital discharge) Compared to Baseline. Values will be reported in comparison to baseline in the two treatment groups.
Change in Markers of NETosis at 30 Days Compared to Baseline
时间窗: 30 days
Values will be reported in comparison to baseline in the two treatment groups.
次要结局
未报告次要终点
研究者
Susan Smyth
Principle Investigator
University of Kentucky