December 2, 1997Circulation
Bimodal Distribution of Angiographic Measures of Restenosis Six Months After Coronary Stent Placement
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Discussion
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Implication
Cohort study reveals bimodal angiographic restenosis patterns in stented coronary lesions, indicating two distinct patient populations with differing renarrowing risks.
Key Points
- To assess the frequency distribution of angiographic indexes of restenosis at six months following coronary stent implantation to test whether lesion renarrowing follows a bimodal pattern.
- Quantitative coronary angiography was performed before, immediately after, and 6 months after successful Palmaz-Schatz stent placement in 1,084 lesions across 1,084 patients (80.4% follow-up rate).
- Deconvolution analysis was applied to frequency distributions of diameter stenosis, minimal luminal diameter (MLD), and lumen loss at follow-up, excluding 22 totally occluded lesions from most analyses.
- Diameter stenosis, MLD, and lumen loss at 6 months deviated from normal distributions and exhibited a bimodal pattern consisting of two distinct normal subcomponents.
- The larger subgroup exhibited mild renarrowing with a mean diameter stenosis of 27% and mean MLD of 2.19 mm, whereas the higher-restenosis subgroup had a mean diameter stenosis of 68% and mean MLD of 0.76 mm.
- The intersection cutoff between the two theoretical distributions occurred at 53.5% for diameter stenosis and 1.09 mm for MLD at follow-up.
Cite This Study
Schömig et al. (1997) studied this question.