Percutaneous revascularization of coronary chronic total occlusion: Toward a reappraisal of the available evidence

Area of Science:

• Cardiology
• Interventional Cardiology

Background:

• Chronic total occlusion (CTO) is a significant challenge in coronary artery disease, linked to poorer prognoses.
• Existing observational studies on percutaneous coronary intervention (PCI) for CTO show mixed results regarding clinical benefits and hard endpoints.
• Comparisons often lack true control groups, focusing instead on successful vs. failed PCI outcomes.

Purpose of the Study:

• To evaluate the current evidence regarding the clinical utility and outcomes of CTO-PCI.
• To highlight the limitations of existing observational data and the need for randomized trials.
• To contextualize CTO-PCI within current treatment guidelines and its comparison to surgical revascularization.

Main Methods:

• Review of observational studies comparing CTO-PCI with medical management and surgical revascularization.
• Analysis of studies examining successful versus failed CTO-PCI.
• Identification of ongoing randomized controlled trials in the CTO-PCI space.

Main Results:

• Observational data suggest CTO-PCI may improve ischemia and quality of life, but evidence on hard clinical outcomes is conflicting.
• Studies comparing CTO-PCI to optimal medical treatment show comparable long-term mortality.
• Coronary artery bypass grafting is often favored for complete revascularization in multi-vessel disease with CTO, based on SYNTAX scores and guidelines.

Conclusions:

• The definitive benefit of CTO-PCI remains unclear due to inconsistent evidence and lack of robust randomized trials.
• Current guidelines reflect this uncertainty, with ongoing trials expected to provide crucial evidence.
• The role of CTO-PCI in relation to optimal medical treatment and surgical options requires further clarification through high-quality research.