Immediate Versus Delayed Stenting in Patients With ST-Elevation Myocardial Infarction Undergoing Mechanical Intervention
试验速览
- 阶段
- 4 期
- 入组人数
- 100
- 试验地点
- 1
- 主要终点
- Myocardial blush grade (MBG) equal or greater than 2
研究概览
简要总结
The goal of primary PCI is to restore anterograde myocardial flow. Stenting a largely thrombotic lesion may determine distal embolisation of thrombotic material therefore deteriorating myocardial perfusion.
详细描述
In the setting of largely thrombotic lesions such as those treated in the context of primary PCI, stenting often results in distal micro and macro-embolisation which hampers coronary flow and microvascular recovery. Interestingly in some of these studies comparing BMS versus balloon angioplasty an early hazard associated to the use of stent has been reported.
Thus, investigators hypothesize in this protocol that refraining from stenting during the acute phase of ST segment myocardial infarction is safe and associated to improved myocardial recovery as compared to acute stenting.
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
- Single (Outcomes Assessor)
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
- •chest pain for >30 min with ST-segment elevation of one mm or more in 2 or more contiguous ECG leads or with presumably new left bundle-branch block
- •admission either within 12 h of symptom onset or between 12 and 24 h with evidence of continuing ischaemia
排除标准
- •the exclusion criteria will include history of bleeding diathesis or documented allergy/intolerance or contraindication to clopidogrel or ticlopidine or prasugrel
- •inability to assume an oral P2Y12 receptor blocker on a consecutive daily basis for a minimum of 6 months, or to heparin or aspirin
- •uncontrolled hypertension (systolic or diastolic arterial pressure >180 mmHg or 120, respectively, despite medical therapy)
- •limited life expectancy, e.g. neoplasms, others
- •inability to obtain informed consent
- •pregnancy
- •patients were not enrolled if they were clinically unstable, presented with severe arrhythmia, or had known contraindications to CMR (claustrophobia, pacemakers, or implantable defibrillator devices)
研究组 & 干预措施
Immediate stenting
Patients being randomized to the immediate stenting arm will be managed according to the guidelines. Irrespective of TIMI flow at presentation, investigators will be requested to thrombus aspirate immediately after successful wiring of the culprit vessel followed by direct stenting. In cases where insertion of thrombus removal catheter and/or direct stenting is not successful, balloon angioplasty will be allowed.
干预措施: Immediate stenting (Procedure)
Delayed stenting
Patients being randomized to the delayed/staged stenting arm will be managed with the aim to obtain stable TIMI 3 flow with no considerations given at the percentage of residual stenosis at the culprit lesion.
In patients presenting with TIMI 3 flow, investigators will be left free to wire the vessel and proceed to thrombus aspiration to decrease thrombus burden in the culprit lesion or to leave the vessel untreated at the time of index PCI. Patients presenting with suboptimal TIMI flow (i.e. less than 3), investigators are required to wire the vessel and thrombus aspirate. If stable (persisting for at least 5 minutes) TIMI 3 flow is obtained, investigators are requested to stop the procedure. The goal is to achieve s table TIMI 3 flow with no considerations given to the percentage of residual stenosis. Stenting in this arm will be allowed only on a bail-out strategy.
干预措施: Delayed stenting (Procedure)
结局指标
主要结局
Myocardial blush grade (MBG) equal or greater than 2
时间窗: post-procedure
The MBG will be estimated visually by 2 experienced observers, as previously described.
次要结局
- ST segment elevation resolution(30 minutes after the procedure)
- ST segment elevation Resolution(90 minutes after the procedure)
- infarct size(5 days)
- Infarct size(6 months)
- microvascular obstruction(6 months)
- Mortality(6 months)
- microvascular obstruction(5 days)
研究者
Marco Valgimigli
Head of the Catheterization laboratory
Università degli Studi di Ferrara