Dyspnea Clinical Trial
Official title:
A Randomized Multicentre Trial to Evaluate the Utilization of Revascularization or Optimal Medical Therapy for the Treatment of Chronic Total Coronary Occlusions
CTOs are common among patients with angina, and are detected in around 20% of patients
undergoing coronary angiography. Treatment of CTO has been found to constitute only 7% of PCI
practice on average. One of the reasons for the under-presentation of CTOs in PCI target
lesions is the lack of evidence-based medical data on treatment indications, and the
continued low level of accepted evidence for the treatment of CTOs by PCI in PCI guidelines.
Patients with a CTO represent patients with stable coronary artery disease. The COURAGE trial
comparing PCI with optimal medical therapy in stable coronary disease did not show a
difference in mortality or myocardial infarction between the two treatment options. However,
CTOs were not included in the COURAGE trial. But that trial did confirm the superiority of
PCI over OMT in controlling symptoms of angina, with a high cross-over rate to PCI. Whether
PCI for CTO is superior to OMT in reducing MACE in those patients with a large ischaemic
burden has never been tested in a randomized controlled trial.
While there is compelling evidence from registry studies of a clinical and prognostic benefit
following successful PCI of CTO compared with PCI failure, there has been no randomized
controlled trial of contemporary PCI using drug-eluting stents versus optimal medical
therapy. The COURAGE trial nuclear sub-study confirms both that prognosis is closely related
to the extent of residual ischaemia and that PCI is more effective in reducing residual
ischaemia than optimal medical therapy alone. This confirms earlier retrospective data
suggesting that the benefit of PCI is greatest in patients with moderate (10-20%) or severe
(>20%) ischaemia.
Study hypothesis: PCI with Biolimus eluting stent implantation plus OMT will be superior to
OMT alone in improving health status at 12-month follow-up, and will be noninferior with
respect to the composite of all cause death/ non fatal MI at 36-month follow up, in patients
with a CTO in an epicardial coronary artery >2.5 mm diameter and chronic stable angina with
evidence of ischemia and viability in the territory subtended by the CTO
n/a
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