Chronic Total Occlusions: Current Approaches, Evidence and Outcomes

Area of Science:

• Cardiology
• Interventional Cardiology
• Vascular Medicine

Background:

• Chronic total occlusions (CTOs) are complete coronary artery blockages present for over three months, found in up to 25% of angiograms.
• Percutaneous coronary intervention (PCI) for CTOs is technically demanding but success rates exceed 90% in expert centers due to technological and operator advancements.

Purpose of the Study:

• To review the current evidence and strategies for percutaneous coronary intervention (PCI) in chronic total occlusions (CTOs).
• To highlight the benefits, challenges, and future directions in CTO treatment.

Main Methods:

• Review of observational studies and randomized controlled trials (RCTs) on CTO-PCI.
• Discussion of interventional techniques, imaging modalities, and current guideline recommendations.
• Emphasis on the need for future adequately powered RCTs with extended follow-up.

Main Results:

• Successful CTO-PCI is associated with improved angina relief, quality of life, and left ventricular function.
• Observational data suggest long-term reductions in cardiac and all-cause mortality.
• RCTs have primarily shown symptomatic benefits, with inconsistent reductions in major adverse cardiac events (MACE) or mortality.

Conclusions:

• CTO-PCI offers significant symptomatic relief and quality of life improvements.
• While observational data suggest mortality benefits, robust RCT evidence is still lacking.
• Individualized treatment decisions, guided by a Heart Team, are crucial for selected symptomatic patients.