Modification Procedures for Chronic Total Occlusion Percutaneous Coronary Intervention: Insights From the...

Area of Science:

• Interventional Cardiology
• Cardiovascular Research
• Medical Device Technology

Background:

• Chronic Total Occlusion (CTO) modification procedures involve intentional balloon dilatation of the entire CTO segment.
• These procedures are performed during percutaneous coronary intervention (PCI) for complex CTOs.
• Understanding the impact of prior modification on repeat PCI outcomes is crucial for treatment optimization.

Purpose of the Study:

• To compare outcomes of repeat CTO PCI in patients with and without prior CTO modification.
• To evaluate the association of CTO modification with lesion characteristics and procedural success.
• To compare different CTO modification techniques, specifically STAR versus SPM.

Main Methods:

• Retrospective analysis of 2869 CTOs from 2829 patients undergoing repeat CTO PCI after a failed initial attempt.
• Comparison of baseline characteristics, procedural success, and major adverse cardiac events (MACE) between CTOs with and without modification.
• Subgroup analysis of modification techniques: Subintimal Tracking and Re-entry (STAR) versus Subintimal Plaque Modification (SPM).

Main Results:

• CTO modification was performed in 20.9% of repeat CTO PCI cases.
• Modified CTOs exhibited higher complexity: increased calcification, tortuosity, length, and J-CTO scores.
• No significant differences in technical success (84.1% vs. 85.4%), procedural success (82.7% vs. 84.2%), or MACE (1.7% vs. 1.8%) were observed between groups.
• STAR demonstrated significantly higher technical success (82.5%) compared to SPM (60.0%).

Conclusions:

• CTO modification during repeat PCI is associated with similar technical and procedural success and MACE compared to no prior modification, despite increased lesion complexity.
• Subintimal Tracking and Re-entry (STAR) is a more effective modification technique than Subintimal Plaque Modification (SPM).
• These findings support the utility of CTO modification in complex cases, highlighting STAR as a preferred method.