Comparison of intravascular ultrasound and quantitative coronary angiography for the assessment of coronary artery...

Area of Science:

• Cardiovascular Imaging
• Interventional Cardiology
• Medical Technology Assessment

Background:

• The comparative effectiveness of quantitative coronary analysis (QCA) and intravascular ultrasound (IVUS) for assessing coronary artery disease (CAD) progression or regression remains unclear.
• This study analyzes QCA and IVUS data from a contemporary clinical trial to address this uncertainty.

Purpose of the Study:

• To compare the diagnostic accuracy of QCA and IVUS in evaluating coronary artery disease progression and regression.
• To investigate the correlation between QCA and IVUS measurements at baseline and over time.

Main Methods:

• Analysis of angiographic (QCA) and intravascular ultrasound (IVUS) data from 525 patients at single time points and 432 patients for changes over time.
• Central laboratory analysis of QCA and IVUS data to assess correlations between lumen dimensions, stenosis scores, and atheroma volume.

Main Results:

• Significant correlations were found between QCA scores and IVUS-derived lumen and vessel volumes at baseline (r=0.65 and r=0.55, respectively).
• Correlations between changes over time in lumen dimensions (QCA vs. IVUS) were statistically significant but weak (P=0.005).
• Angiographic progression identified by QCA was associated with a significant increase in IVUS-measured plaque volume (9.13 mm3) compared to no angiographic progression (0.20 mm3, P=0.028).

Conclusions:

• QCA and IVUS measures of lumen dimensions demonstrate correlation both at single time points and for longitudinal changes.
• Despite weak correlations in continuous variables for atheroma volume changes, QCA-detected disease progression aligns with substantial plaque volume increases on IVUS.