Study of the Coronary Microcirculation After Primary Angioplasty : Analysis of Absolute Coronary Blood Flow Rates and Resistance, Index of Microcirculatory Resistance and Comparison With Magnetic Resonance Imaging
试验速览
- 阶段
- 不适用
- 状态
- 终止
- 入组人数
- 31
- 试验地点
- 2
- 主要终点
- Microvascular obstruction on MRI
研究概览
简要总结
In the management of acute myocardial infarction treated with primary angioplasty, despite effective epicardial clearance obtained in 95% of cases, microvascular obstruction (MVO) in the damaged territory concerns 50% of patients. The Index of Microvascular Resistance (IMR) allows early assessment of the microcirculatory state during the angioplasty procedure. A value of IMR>40 indicates MVO and is correlated with morbi-mortality. A new method for immediate evaluation of MVO using thermodilution with a new Rayflow® microcatheter has been described: it no longer allows the estimation but the measurements of absolute coronary resistance and coronary flow. We hypothesize that these measurements allows a better evaluation of the microcirculatory state after primary angioplasty, comparing to IMR.
The main objective is to study the diagnostic performance of Rayflow® to predict MVO - no reflow (NR) - in ST-Elevation Myocardial Infarction (STEMI) patients in order to determine an absolute coronary resistance threshold by thermodilution for early diagnosis of MVO.
The main secondary objectives will be to compare the different microcirculatory assessment parameters with each other, not indexed and indexed to the myocardial mass at risk (coronary resistance, IMR, CFR, Resistance Reserve Ratio) and to establish a link between high resistance or IMR and the occurrence of rhythm disorders at D1, D2 and D3.
详细描述
All patients presenting for STEMI by occlusion of a proximal coronary artery, vascularizing a large volume of myocardium corresponding to an APPROACH score> 21, in the first 12 hours following the onset of chest pain, will be included.
Data relating to medical history, lifestyle (sedentary lifestyle, smoking, drug use), cardiovascular risk factors will be collected.
The management of acute coronary syndrome will be carried out in accordance with the European Society of Cardiology guidelines of 2015. An emergency coronary angiography will be used to revascularise the patient as indicated. Thromboaspiration, stenting, antithrombotic agents and other treatments will be administered according to angiographic and clinical criteria.
The FFR guide (PressureWire® Certus® from St Jude Medical Abbott) will be used to make pressure and temperature measurements. It has been used in daily practice since the FAME study in 2011 to guide the therapeutic decision in patients with an intermediate lesion.
An injected cardiac magnetic resonance imaging (MRI) will be performed between 48 hours and 7 days following the infarction in accordance with current practices.The initial trans-thoracic ultrasonography as well as the various blood samplings will be performed according to standard practice.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Diagnostic
- 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
- •Acute ST + coronary syndrome seen within 12 hours after the initial pain: ST offset in 2 contiguous leads ≥ 1mm or ≥ 2mm in precordial or inaugural left branch block, permanent or transient with chest pain > 20 min
- •Patient with an indication for emergency coronary angiography with angioplasty
- •Acute occlusion of a large caliber artery corresponding to an APPROACH score ≥21: proximal or mean anterior interventricular artery, proximal circumflex artery or proximal right coronary artery
- •Final Thrombolysis In Myocardial Infarction (TIMI) of 2 or 3 at the end of the angioplasty procedure regardless of the initial TIMI score
- •Free and informed written consent to participate in the study
排除标准
- •Known history of infarction in the same territory : STEMI or NSTEMI (angioplasty programmed for angina does not constitute a criterion for non-inclusion)
- •Haemodynamic instability requiring the initial use of vasopressive amines or circulatory assistance (counterpulse balloon or extracorporeal membrane oxygenation) or mechanical ventilation (a recovered cardiopulmonary arrest does not constitute an exclusion criterion)
- •Technical impossibility of performing IMR or Rayflow® measurements (tortuous or calcified artery)
- •Persistent high-grade atrioventricular block after primary angioplasty
- •Cardiomyopathy or severe valvulopathy which can induce microcirculatory abnormalities (congenital heart diseases, dilated cardiomyopathy, cardiac amyloidosis, hypertrophic heart disease, mitral regurgitation, aortic regurgitation, tricuspid regurgitation or pulmonary regurgitation grade 3 or 4, tight aortic stenosis or pulmonary stenosis with average gradient > 40 mmHg or vmax > 4m/sec , tight mitral stenosis or tricuspid stenosis with average gradient > 10mmHg)
- •Contraindication to performing cardiac MRI: wearing a pacemaker, intracerebral clip, intraocular foreign body, neurostimulator, severe renal failure with glomerular filtration rate < 30 mL/min, body weight > 150 kg
- •Age < 18 years
- •Pregnant or breastfeeding woman
- •Inclusion in another research protocol < 30 days
- •Patient not affiliated to a social security scheme
- •Patient under guardianship or curatorship
结局指标
主要结局
Microvascular obstruction on MRI
时间窗: Day 7
Establishment of a correlation between absolute coronary resistance and microvascular obstruction on MRI
Absolute coronary resistance
时间窗: Immediately after angioplasty
Threshold value correlated with microvascular obstruction on magnetic resonance imaging (MRI)
次要结局
- Absolute coronary resistance indexed to the myocardial mass(Immediately after angioplasty)
- Index of microvascular resistance(Immediately after angioplasty)
- Mean value of absolute coronary resistances corresponding to an IMR > 40(Immediately after angioplasty)
- Microvascular obstruction in patients with IMR > 40(Day 7)
- IMR indexed to the myocardial mass(Immediately after angioplasty)
- Occurrence of early ventricular rhythm disorders(Day 3)