Complex Right Coronary Artery CTO PCI After a Previous Failed Attempt: A Structured Case Report
Introduction
Chronic total occlusions (CTOs) remain among the most technically demanding lesions in contemporary coronary intervention. Successful CTO PCI requires more than crossing an occluded segment; it depends on careful anatomical assessment, adequate guide support, deliberate wire selection, microcatheter control, and the ability to adapt the strategy as the procedure evolves.
This case describes successful treatment of a complex, long-segment right coronary artery (RCA) CTO involving a previously stented ostial-to-proximal segment in a patient with significant left ventricular systolic dysfunction and a history of unsuccessful CTO PCI.
Presentation
The patient presented with chest pain in the setting of stable angina despite optimal medical therapy.
Echocardiography demonstrated severe left ventricular systolic dysfunction, increasing the procedural risk and complexity.
Coronary angiography showed a dominant RCA with a 100% occlusion involving the previously stented ostial-to-proximal segment. A separate, nonoverlapping stent was present in the mid RCA. The distal RCA was visualized through retrograde collateral filling from the left coronary circulation, providing an important roadmap for CTO intervention.
The patient had also undergone a previous unsuccessful attempt at RCA CTO PCI, adding to the complexity of the repeat intervention.
Anatomy
Preprocedural anatomical assessment was performed using dual-injection coronary angiography. Simultaneous visualization of the proximal and distal aspects of the CTO allowed assessment of:
* The proximal cap
* CTO length
* Distal RCA anatomy
* The distal landing zone
* Collateral circulation
* The relationship between the occlusion and the previously implanted stents
Dual injection is particularly valuable in complex CTOs because the distal vessel may otherwise be poorly visualized from the occluded artery. In this case, retrograde filling of the distal RCA provided useful information for planning the antegrade crossing strategy.
The ostial-to-proximal location of the CTO, the presence of a previous stent, and the long occluded segment also indicated that strong guide support would be required for equipment delivery.
Strategy
The intervention was planned as an antegrade CTO crossing procedure with emphasis on guide-support optimization, controlled wire escalation, and microcatheter support.
An AL1 guide catheter was selected for RCA engagement. To improve guide stability and facilitate advancement of CTO equipment, an anchor wire-and-balloon technique was used.
The CTO crossing strategy incorporated Finecross microcatheter support. Initial crossing attempts were performed with a Gladius CTO wire, followed by escalation to a Gaia II Next wire to achieve more controlled penetration and tracking through the occluded segment.
The microcatheter provided:
* Improved wire control
* Support for wire exchange
* Controlled wire escalation
* Maintenance of guidewire position during equipment exchanges
After successful CTO crossing, the Gaia II Next wire was exchanged for a Rinato wire to facilitate lesion preparation and stent delivery.
Execution
After the CTO was crossed, the occluded segment underwent balloon lesion preparation.
Because of the long, previously stented RCA segment and the challenging proximal anatomy, additional support was required for stent delivery. A GuideLiner catheter was used to facilitate advancement of a 2.75 × 48 mm Biomime drug-eluting stent.
The stent was deployed successfully. Post-dilatation was then performed to optimize the treated segment and achieve an appropriate angiographic result.
The combination of anchor support, microcatheter-assisted wire escalation, and GuideLiner assistance allowed the procedure to proceed despite the limitations imposed by the complex proximal anatomy.
Outcome
Final coronary angiography demonstrated successful RCA CTO revascularization with TIMI grade 3 flow.
No periprocedural complications were reported.
Learning Points
Conclusion
This case demonstrates the importance of a structured and adaptable approach to complex CTO PCI.
A long RCA CTO involving a previously stented ostial-to-proximal segment was successfully treated despite a previous unsuccessful intervention and significant left ventricular systolic dysfunction.
The procedure relied on several complementary techniques:
Dual injection → guide-support optimization → dedicated CTO wiring → microcatheter support → wire escalation → lesion preparation → GuideLiner-assisted stent delivery → post-dilatation
Complex CTO PCI is rarely dependent on a single technique. Successful intervention often results from combining careful anatomical planning with appropriate equipment selection, guide support, wire escalation, and the ability to modify the strategy according to the anatomy encountered during the procedure.