International Randomized Trial on the Effect of Revascularization or Optimal Medical Therapy of Chronic Total Coronary Occlusions With Myocardial Ischemia - ISCHEMIA-CTO Trial
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 发起方
- 入组人数
- 1,560
- 试验地点
- 49
- 主要终点
- Major Adverse Cerebral and Cardiovascular Events
研究概览
简要总结
Study design
Prospective randomized open labeled multicenter study
Hypotheses
- In asymptomatic patients with ≥ 10% of myocardial ischemia: PCI (Percutaneous Coronary Intervention) with latest generation of drug eluting stents is superior to optimal medical therapy in terms of relative reduction in MACCE (Major Adverse Cardiovascular and Cerebrovascular events).
- In symptomatic patients with ≥ 5% of myocardial ischemia: PCI with latest generation of drug eluting stents is superior to optimal medical therapy (OMT) in terms of improved life quality measured as an increase of SAQ (Self Assessment Questionnaire) score of 8 points after 6 months.
Inclusion Criteria
- CTO in native coronary artery
- Myocardial ischemia in a territory supplied by CTO assessed by nuclear imaging.
- Age ≥18 yrs.
- Able to provide written Informed consent and willing to comply with the specified follow-up contacts
- Target artery ≥ 2.5 mm
Prior to randomization all patients undergo 3 months of OMT. Subsequently the population will be divided into:
Cohort A: Asymptomatic (CCS < 2 and SAQ QoL > 60) patients with myocardial ischemia (≥ 10% of LV) in a territory supplied by CTO
Cohort B: Symptomatic patients (CCS class ≥ 2 and/or SAQ QoL score ≤ 60 after treating non CTO lesions and after OMT) with Myocardial ischemia (5% of LV) in a territory supplied a CTO
Cohort C: patients enrolled but not randomized in cohort A or B
Exclusion criteria (for both cohort A and B)
- NSTEMI or STEMI within 1 month
- Coronary anatomy not suitable for CTO-procedure
- Coronary artery disease involving the left main/three-vessel disease with indication for CABG following heart team conference
- Life expectancy < 2 years
- Severe chronic pulmonary disease (FEV1 < 30 % of predicted value)
- Contraindication to dual anti-platelet therapy
- Pregnancy
- eGFR < 30 mL/min/1.73 m2
- In multi-vessel disease: if it is deemed unsafe to treat the non-CTO lesion first.
- Severe valvular heart disease
Primary endpoint
Cohort A: Composite endpoint of MACCE (all-cause mortality, stroke, any myocardial infarction, clinically driven revascularization*), hospitalization for heart failure or incidence of malignant arrhythmias.
*CCS class ≥ 2 and/or QoL score < 60. Same criteria used as for allocation to Cohort B
Cohort B: SAQ Quality of Life Assessment after 6 months.
Number of patients
1,560 (1200 in cohort A/360 in cohort B
Follow up time
Cohort A: 5 years Cohort B: 6 months
详细描述
A chronic total occlusion (CTO) is observed in up to (1) 30 % of patients undergoing diagnostic coronary angiography. The presence of a CTO is associated with worse outcome compared to non-occlusive coronary artery disease.
Percutaneous Coronary Intervention (PCI) treatment of CTO lesions has gained much attention over the last decade due to introduction of new techniques and devices resulting in high success rates in dedicated centers. However the scientific evidence is mainly based on observational studies and expert consensus. The current European and American guidelines on revascularization does not provide any clear recommendations how to manage patients with CTO.
The indication of treating a CTO lesion, or any other lesion with PCI for that matter, is either to relieve symptoms or improve prognosis. However, to date, there are no randomized clinical trials showing any prognostic benefit from CTO revascularization. Data from randomized clinical trials are also scarce regarding improvement of symptoms and Quality of life (QoL). In the recently presented DECISION-CTO study, patients were randomized to PCI vs. OMT, and the study failed to demonstrate a prognostic or symptomatic benefit of PCI vs. OMT. However, the study was prematurely terminated due to slow inclusion rate and had a high crossover rate and a high proportion did not have a quality of life score at follow-up. The fact that both the Decision CTO and the Euro CTO trial failed to include the pre-specified number of patients, makes it difficult to draw any conclusions on how to treat these patients. The preliminary results from both trials indicate that CTO PCI seems to be a safe procedure and might improve symptoms and QoL. In the randomized EXPLORE trial, patients with ST-elevation myocardial infarction (STEMI)and a concomitant CTO in a non infarct related artery was investigated. This study showed no benefit in terms of improving left ventricular function due to CTO-PCI of the concomitant CTO, although the procedure was safe.
Meta-analysis of observational studies comparing the prognosis after successful vs. unsuccessful CTO PCI indicate prognostic and symptomatic benefit of successful CTO PCI. However, these studies often lack data regarding ischemia burden and viability. The fact that the non-successful PCI patients consistently in these studies have higher risk profile, indicating the presence of residual confounders not accounted for in the multivariate statistical models, makes the interpretation of these data in a clinical setting difficult. The non-randomized FACTOR trial demonstrated a positive outcome for quality of life, but only in symptomatic patients. Data from the OPEN-CTO registry demonstrated an improvement of the Seattle Angina Questionnaire for quality of life by 10.8 points after a successful CTO-procedure. In addition to symptomatic improvement, a successful CTO procedure can reduce the amount of myocardium susceptible to ischemia in patients with at least mild to moderate ischemia at baseline and by that the prognosis can be improved (mortality, myocardial infarction, ventricular arrhythmias).
Hence, the interventional management of CTO lesions must address whether it is indicated on symptomatic and/or prognostic basis. These questions have not been sufficiently addressed in the previous trials and we need evidence from randomized clinical trials on how to treat these patients. We therefore designed this randomized clinical trial addressing the impact of CTO PCI on outcome. Patients are included in 2 different patient cohorts depending on level of symptoms and level of myocardial ischemia. From previous studies, we know that it is most probably only patients with at least moderate myocardial ischemia who will benefit from CTO PCI in terms of improving MACCE, and only symptomatic patients who will benefit with regard to improvement of quality of life following CTO PCI.
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
- •CTO in native coronary artery
- •Myocardial ischemia in a territory supplied by CTO assessed by nuclear imaging.
- •Age ≥18 yrs.
- •Able to provide written informed consent and willing to comply with the specified follow-up contacts.
- •Target artery ≥ 2.5 mm
- •Prior to randomization all patients undergo 3 months of OMT. Subsequently the population will be divided into:
- •Cohort A: Asymptomatic (CCS < 2 and SAQ QoL > 60) patients with myocardial ischemia (≥ 10% of LV) in a territory supplied by CTO
- •Cohort B: Symptomatic patients (CCS class ≥ 2 and/or SAQ QoL score ≤ 60 after treating non CTO lesions and after OMT) with Myocardial ischemia (5% of LV) in a territory supplied a CTO assess by nuclear imaging.
- •Cohort C: Screening population not eligible for randomization in cohort A or B
排除标准
- •NSTEMI or STEMI within 1 month
- •Coronary anatomy not suitable for CTO-procedure
- •Coronary disease involving the left main/three vessel disease with indication for CABG following heart team conference.
- •Life expectancy < 2 years
- •Severe chronic pulmonary disease (FEV1 < 30 % of predicted value)
- •Contraindication to dual anti-platelet therapy
- •Pregnancy
- •eGFR < 30 mL/min/1.73 m2
- •In multi-vessel disease: if it is deemed unsafe to treat the non-CTO lesion first.
- •Severe valvular heart disease
研究组 & 干预措施
PCI
干预措施: Percuteneous Coronary Intervention (Procedure)
OMT
干预措施: Optimal Medical Therapy (Other)
结局指标
主要结局
Major Adverse Cerebral and Cardiovascular Events
时间窗: 5 Year
Primary outcome in the Cohort A.
Quality of life - Seattle Angina Questionnaire
时间窗: 6 months
Primary outome in the Cohort B
次要结局
未报告次要终点
研究者
Evald Hoej Christiansen
Consultant MD PhD
Aarhus University Hospital Skejby