Acute Myocardial Infarction With HyperOxemic Therapy II
试验速览
- 阶段
- 3 期
- 状态
- 已完成
- 发起方
- 入组人数
- 317
- 试验地点
- 2
- 主要终点
- A single SPECT scan will be used to determine whether or not the treatment results in a significant reduction in infarct size in the treatment group. The scan is performed 14 days post-event.
研究概览
简要总结
To determine whether or not HyperOxemic therapy rendered to patients (that meet the study inclusion criteria) with anterior acute myocardial infarction < 6 hours from symptom onset to reperfusion, results in a significant reduction in infarct size as measured by SPECT @ 14 days post event.
详细描述
The AMIHOT II clinical trial is designed as a focused study of a promising patient subset from the completed AMIHOT study. A brief synopsis of the AMIHOT experience is provided below, followed by a description of the AMIHOT II study.
The pivotal AMIHOT clinical study for the TherOx® Aqueous Oxygen (AO) System in treating post acute myocardial infarction (AMI) patients was approved by FDA on January 10, 2002 under IDE G980257/S011. The study objective was to determine whether the adjunctive administration of AO Therapy immediately after successful PCI in a group of patients presenting less than 24 hours from AMI symptom onset improves left ventricular function and reduces the area of infarction, with no increased incidence of 30-day Major Adverse Cardiac Events (MACE) when compared to a control group receiving only PCI standard-of-care treatment. 30-day MACE comprises the combined incidence of death, reinfarction, target vessel revascularization, and stroke.
Two hundred eighty-nine (289) patients were enrolled from January 16, 2002 through December 24, 2003, including 20 run-in subjects and 269 randomized patients. Three independent biomarkers (infarct size reduction, regional wall motion score improvement at three months, and reduction in ST segment elevation) were designated as co-primary endpoints to evaluate the effectiveness of AO Therapy. The study was designed to demonstrate superiority of the AO Therapy group as compared to controls for each of these endpoints, and to demonstrate non-inferiority of the AO Therapy group as compared to Control with respect to 30-day MACE. The study population was comprised of qualifying AMI patients treated with either PCI alone or with AO Therapy as an adjunct to successful PCI within 24 hours of symptom onset.
The observed 30-day MACE rates were comparable between the AO Therapy and Control groups. The AMIHOT trial results revealed positive trends for the overall study population in favor of the AO Therapy test group in each of the three co-primary endpoints. These favorable results did not demonstrate the required level of statistical significance to claim superiority. However, an examination of a pre-specified patient subset, anterior AMI subjects treated within six hours of symptom onset, showed promising results after analysis of the surrogate endpoint data, forming the basis for this IDE supplement that requests approval to conduct a new trial focused on this further defined patient population.
TherOx has designed a follow-up clinical trial focused on these anterior AMI subjects treated within six hours, utilizing a Bayesian statistical design that incorporates both the existing AMIHOT data, and the new proposed AMIHOT II study data, into a hierarchical model for combined analysis.
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
- •Candidates for this study must meet ALL of the following criteria:
- •Patient must be >= 18 years of age
- •AMI must be anterior
- •Patient is experiencing clinical symptoms consistent with anterior AMI of < 6 hour duration from time of symptom onset until admission to the emergency room
- •Complete medical history, history of AMI, previous coronary interventions, list of medications given within last 24 hours
- •12-lead qualifying ECG criteria: Anterior infarction (ST-segment elevation > 1 mm in two or more contiguous leads between V1 and V4 or new left bundle branch block (LBBB) with documentation of LAD system culprit lesion)
- •Patient provides written, Informed Consent
- •Patient and his/her physician agree to all required follow-up procedures and visits
- •Women of childbearing potential who have a negative pregnancy test (applies to female patients only)
- •ANGIOGRAPHIC INCLUSION CRITERIA: These are evaluated after the subject has provided signed Informed Consent but prior to randomization:
- •Based on coronary anatomy, PCI is indicated for culprit lesion with anticipated use of an Intra-Coronary Stent
- •TIMI 0, I, or II flow is present on the initial angiographic injection of the infarct-related artery
- •Successful angioplasty as documented by < 50% diameter residual angiographic stenosis within and associated with the culprit lesion and ³ TIMI II flow and no major complications such as perforation or shock
- •Documented time of reperfusion is < 6 hours from the documented time of symptom onset
排除标准
- •Candidates will be excluded from this study if ANY of the following conditions apply:
- •Patients with ventricular pseudoaneurysm, VSD, or papillary muscle rupture.
- •Absolute contraindications to anticoagulant therapy, including hemorrhagic diathesis or thrombocytopenia
- •Systemic Arterial pO2 is < 80 mmHg with supplemental oxygen
- •Placement of an intra-aortic balloon pump (IABP)
- •Patient has had coronary bypass surgery during the 30 day period preceding PCI
- •Severe known cardiac valvular stenosis or insufficiency, pericardial disease, or non-ischemic cardiomyopathy
- •Patients requiring cardiopulmonary resuscitation for > 10 minutes
- •Cardiogenic shock (SBP < 80 mm Hg for more than 30 minutes unresponsive to fluids or requiring intravenous pressors or placement of an IABP)
- •Expected survival of less than 6 months due to non-cardiac condition
- •Current participation in other investigational device or drug trials that have not finished the primary efficacy endpoint follow-up parameters
- •Patient has had a hemorrhagic stroke during the 6 month period preceding PCI
- •Physician discretion regarding unacceptability for enrollment
- •ANGIOGRAPHIC EXCLUSION CRITERIA: These are evaluated after the subject has provided signed Informed Consent but prior to randomization:
- •Any proximal coronary diameter stenosis > 40 % that would restrict native flow with the Tracker-38 infusion catheter in place
- •Infarct-related vessels that are either saphenous vein grafts and/or small second order coronary vessels that do not supply significant areas of myocardium
- •Presence of a non-stented coronary dissection upon completion of the PCI procedure
- •Unprotected left main diameter stenosis > 60%
- •Severe target vessel calcification or tortuosity
- •Multi - vessel disease that in the judgment of the investigator is best treated with emergent or urgent CABG or additional PCI within 30 days
- •In the investigator's opinion, the target vessel is unsuitable for either placing the infusion catheter or treatment with PCI
结局指标
主要结局
A single SPECT scan will be used to determine whether or not the treatment results in a significant reduction in infarct size in the treatment group. The scan is performed 14 days post-event.
时间窗: 14 +/- 7 days
Safety will be determined by comparing 30-day MACE (Major Adverse Cardiac Events) rates, where MACE is comprised by the combined incidence of death, stroke, repeat MI, and target vessel revascularization.
时间窗: 30 days
次要结局
- ST elevation reduction will be compared between the two randomized groups at 3, 4, and 6 hours post-intervention(3, 4, and 6 hrs post-intervention)