Difference Between Low-Speed and High-Speed Rotational Atherectomy Using Two Types of Guidewires

Area of Science:

• Cardiovascular Interventions
• Medical Device Technology
• Interventional Cardiology

Background:

• Severe calcified lesions require debulking devices for effective treatment.
• Rotational atherectomy (RA) modifies calcified plaques, but procedural variables' impact is unclear.

Purpose of the Study:

• To evaluate guidewire type and rotational speed effects on RA ablation performance.
• Utilized an in vitro simulation system with HEARTROID and optical coherence tomography (OCT).

Main Methods:

• Tested two guidewire types (floppy, extra-support) at high (190,000 rpm) and low (140,000 rpm) speeds in 20 calcified lesions.
• Pre- and post-ablation OCT assessed lumen area, directional discrepancy, and debulked regions.

Main Results:

• High-speed RA with floppy wires increased directional discrepancy; extra-support wires showed the opposite.
• Extra-support wires with high-speed ablation yielded the most predictable and controlled debulking.
• Debulked area trends varied by wire type and speed but lacked statistical significance.

Conclusions:

• Guidewire type and rotational speed significantly influence directional control in RA.
• High-speed ablation combined with an extra-support wire minimizes directional discrepancy for controlled lesion modification.