Changes in myocardial perfusion after catheter-based percutaneous laser revascularisation

Area of Science:

• Cardiovascular Medicine
• Interventional Cardiology
• Nuclear Cardiology

Background:

• Coronary artery disease (CAD) poses significant challenges for patients unresponsive to traditional revascularization.
• Percutaneous laser revascularisation (PMR) is an emerging therapy showing promise for angina relief and improved exercise tolerance.
• The impact of PMR on myocardial perfusion has not been previously documented in clinical studies.

Purpose of the Study:

• To investigate the effect of PMR on regional myocardial blood flow in patients with end-stage CAD.
• To assess changes in myocardial perfusion using thallium-201 single-photon emission tomography (SPECT) before and after PMR.

Main Methods:

• Thirty-six patients with end-stage CAD underwent SPECT studies at baseline and 3, 6, and 12 months post-PMR.
• Studies included pharmacological stress and rest scintigraphy, with semiquantitative evaluation of 14 standardized myocardial wall segments.
• Segments were classified by PMR treatment location and baseline perfusion deficit severity (none, slight, moderate, severe).

Main Results:

• In treated segments with moderate or severe baseline perfusion deficits, stress scintigraphic densities increased significantly at 12 months post-PMR (P<0.05).
• Segments with no baseline deficit showed a decrease in stress scintigraphic densities (P<0.05), indicating a normalization effect.
• Rest perfusion remained unchanged, but stress-rest differences within target areas diminished, suggesting improved myocardial flow reserve.

Conclusions:

• PMR leads to improved regional myocardial flow reserve in segments with initially reduced stress perfusion.
• The observed improvements in myocardial perfusion correlate with the reported clinical benefits of PMR in angina patients.
• PMR represents a viable therapeutic option for enhancing myocardial perfusion in select CAD patients.