Occluded Artery Trial (OAT)
Note that you will be prompted to log in or register an account
Open BioLINCC Study See bottom of this webpage for request information
September 1999 – May 2011
August 1, 2012
Clinical Trial URLs
Primary Publication URLs
Commercial Use Data Restrictions No
Data Restrictions Based On Area Of Research No
To test the hypothesis that opening an occluded infarct artery 3-28 days after an acute MI (day 1= date of index MI) in stable patients who are at increased long-term risk (ejection fraction <50% or proximal occlusion of a large coronary artery) will reduce the composite endpoint of mortality, recurrent MI, and New York Heart Association (NYHA) Class IV congestive heart failure (CHF) over an average three-year follow-up.
The benefits of establishing early coronary perfusion in acute myocardial infarction (MI) have been unequivocally established. However, often due to late presentation, a substantial number of acute MI patients are ineligible for reperfusion therapy by exceeding the time for which acute reperfusion therapy provides a documented benefit. The best strategy of care for those with persistent total occlusion of the infarct-related artery, identified after the currently accepted period for administration of reperfusion, was therefore unclear. Late PCI may improve outcomes over medical management alone, by reducing left ventricular remodeling with preservation of left ventricular function, improving electrical stability, potentially decreasing ventricular arrhythmia, or providing collateral blood flow to coronary territories at risk of future occlusion.
2166 stable patients who had total occlusion of the infarct-related artery 3 to 28 days after myocardial infarction and who met a high-risk criterion (an ejection fraction of <50% or proximal occlusion). Of these patients, 1082 were assigned to routine PCI and stenting with optimal medical therapy, and 1084 were assigned to optimal medical therapy alone. An additional 35 patients were enrolled in 2006 as part of the OAT-NUC (nuclear ancillary study).
Patients at approximately 320 clinical sites in the United States and Canada were randomly allocated to two treatment arms over two years. One treatment consisted of conventional medical management including aspirin, beta blockers, angiotensin converting enzyme (ACE) inhibitors, and risk factor modification. The other treatment consisted of conventional medical therapy plus percutaneous coronary intervention and coronary stenting. Clinical outcomes were compared using an intention-to-treat analysis. The primary composite endpoint was mortality, recurrent myocardial infarction, and hospitalization for NYHA Class IV congestive heart failure over a three year follow-up. An additional 3 years of follow-up was conducted extending the follow-up to a maximum of 9 years (average approximately 5.5 years). Individual components of the study composite endpoint were compared in the two treatment arms, as were the medical costs of the two treatments and the health-related quality of life. The cost-effectiveness of percutaneous revascularization was assessed in the study population.
PCI did not reduce the occurrence of death, reinfarction, or heart failure, and there was a trend toward excess reinfarction during 4 years of follow-up. Extended follow-up continued to show no reduction in clinical events after PCI (NEJM, 2006; 355(23):2395-407, Circulation, 2011; 124(21):2320-8)
Please note that researchers must be registered on this site to submit a request, and you will be prompted to log in. If you are not registered on this site, you can do so via the Request button. Registration is quick, easy and free.
Resources AvailableStudy Datasets Only
- Data Dictionary (PDF - 1.4 MB)
- EQOL Manual (PDF - 495.9 KB)
- Forms List (PDF - 362.5 KB)
- Procedures Manual (PDF - 1.7 MB)
- Publications (PDF - 142.5 KB)
- Quality of Life International Protocol (PDF - 265.0 KB)
- Schedule Of Measurements (PDF - 35.8 KB)
- Study Protocol (PDF - 897.2 KB)
Persons using assistive technology may not be able to fully access information in the study documents. For assistance, Contact BioLINCC and include the web address and/or publication title in your message. If you need help accessing information in different file formats such as PDF, XLS, DOC, see Instructions for Downloading Viewers and Players.