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Quantitative measurements of balloon-to-artery ratios in coronary angioplasty
1Second Department of Medicine, Kyoto Prefectural University of Medicine.
Insights
Choosing the right balloon size in percutaneous transluminal coronary angioplasty (PTCA) is key. A balloon-to-artery ratio above 1.0 reduces residual stenosis and repeat procedures for coronary artery disease.
Area of Science:
- Cardiology
- Interventional Cardiology
- Medical Imaging
Background:
- Percutaneous transluminal coronary angioplasty (PTCA) is a common procedure for treating coronary artery stenosis.
- Determining the optimal balloon-to-artery ratio is crucial for successful PTCA outcomes.
- Accurate measurement of coronary dimensions is essential for optimizing balloon selection.
Purpose of the Study:
- To investigate the impact of the balloon-to-artery ratio on PTCA outcomes.
- To evaluate the relationship between balloon size and residual stenosis, coronary dissection, and restenosis rates.
- To identify the optimal balloon-to-artery ratio for treating left anterior descending coronary artery lesions.
Main Methods:
- Retrospective analysis of 50 patients undergoing elective PTCA for simple, discrete left anterior descending coronary artery lesions.
- Development of a novel quantitative coronary angiography method combining cinevideodensitometry and edge detection for precise arterial measurements.
- Calculation of the balloon-to-artery ratio using cross-sectional areas of the control arterial segment and the angioplasty balloon.
Main Results:
- A significant inverse correlation (r = -0.51) was found between the balloon-to-artery ratio and residual stenosis.
- Patients with a balloon-to-artery ratio < 1.0 experienced greater residual stenosis (59.9% vs 46.0%) and higher rates of repeat PTCA (26% vs 4%).
- Coronary dissection rates were similar between groups, irrespective of the balloon-to-artery ratio.
Conclusions:
- An optimal balloon-to-artery ratio slightly exceeding the control arterial segment dimensions is recommended for PTCA of the left anterior descending artery.
- Utilizing accurate coronary arterial dimension measurement methods is vital for selecting the optimal balloon size.
- A balloon-to-artery ratio > 1.0 is associated with improved PTCA outcomes, reducing residual stenosis and the need for reintervention.
Abstract:
To determine the optimal balloon-to-artery ratio in percutaneous transluminal coronary angioplasty (PTCA), the effects of balloon size on the extent of residual stenosis, the incidence of coronary dissection, and the percentage of cases requiring repeat PTCA for restenosis were examined retrospectively. Fifty consecutive patients who underwent elective PTCA for simple and discrete lesion localized in the left anterior descending coronary artery were selected for this study. To measure the absolute cross-sectional area of the adjacent control segment of the artery, we developed a new method of quantitative coronary angiography, a hybrid of cinevideodensitometry and the edge detection method. The balloon-to-artery ratio was calculated as the cross-sectional area ratio between the control segment adjacent to the stenosis and the balloon which was visually selected by the operator during PTCA. Residual stenosis was determined as the percent area of stenosis by our hybrid method using cinevideodensitometry. The balloon-to-artery ratio ranged from 0.4 to 2.4, and a weak but significant inverse correlation (r = -0.51) was observed between the balloon-to-artery ratio and the extent of residual stenosis. In 23 patients whose balloon-to-artery ratios were less than 1.0, residual stenosis was greater (59.9 +/- 11.9% vs 46.0 +/- 19.6%, p < 0.05), and the percentage of repeat PTCA was higher (26% vs 4%, p < 0.05) than in the group of 27 patients whose balloon-to-artery ratios were higher than 1.0. The incidence of coronary dissection was similar in the 2 groups (9% vs 15%, ns). The percent area of stenosis before PTCA, the number of inflations, the inflation pressures, and the inflation times were also similar between these 2 groups. We concluded that the optimal balloon size is slightly more than the control segment dimensions of simple and discrete isolated stenoses of the left anterior descending artery treated at lower inflation pressures, and that an accurate measurement method of the coronary arterial dimensions is necessary to determine this optimal balloon size.