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Non-randomised studies have reported a prognostic advantage with percutaneous coronary intervention (PCI) in the treatment of chronic total occlusions (CTO). Failure to cross and successfully open a CTO confers a worse clinical outcome, however most trials have included occlusions of short duration (7-30 days). PCI success rates are inversely related to the age of vessel occlusion reflecting temporal, cellular changes within a CTO, namely progressive collagen deposition.

Impact of successful and failed revascularization of chronic total occlusion on left ventricular function and infarct size