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In vivo comparison of different quantitative edge detection systems used for measuring coronary arterial diameters
W Desmet1, I De Scheerder, K Beatt
1Department of Cardiology, University Hospital Gasthuisberg, Leuven, Belgium.
Insights
Different quantitative coronary analysis (QCA) systems yield significantly different results for measuring coronary artery dimensions and changes after angioplasty. These variations impact clinical interpretation, highlighting the need for system standardization in cardiovascular research.
Area of Science:
- Cardiology
- Medical Imaging
- Interventional Cardiology
Background:
- Quantitative coronary analysis (QCA) is crucial for assessing coronary artery disease and treatment outcomes.
- Variability in QCA system performance can affect patient management and research findings.
Purpose of the Study:
- To compare the performance of three distinct QCA systems: Cardiovascular Measurement System (CMS), Polytron 1000, and Angiographic Workstation (AWOS).
- To evaluate inter-system agreement and identify systematic differences in measuring minimal luminal diameter (MLD) and changes post-angioplasty.
Main Methods:
- A comparative study involving 109 patients undergoing coronary angioplasty.
- Coronary angiography was performed before, immediately after, and at follow-up.
- Measurements of MLD and diameter changes were analyzed across CMS, Polytron 1000, and AWOS.
Main Results:
- Low correlation coefficients and wide 95% limits of agreement were observed between the QCA systems.
- CMS showed a tendency for lower values in small vessels and higher values in larger vessels.
- AWOS reported significantly smaller acute gains in MLD compared to Polytron and CMS (P < .0001).
- Long-term gains were substantially larger with Polytron (18.8%) and CMS (20.7%) compared to AWOS (11.5%) (P < .001).
Conclusions:
- Significant systematic differences exist between QCA systems, leading to divergent results in individual patients.
- The choice of QCA system critically influences the assessment of acute and long-term outcomes after coronary angioplasty.
- Standardization of QCA systems is essential for reliable clinical interpretation and comparative research.
Abstract:
Three different systems for quantitative coronary analysis [Cardiovascular Measurement System (CMS); Polytron 1000; Angiographic Workstation (AWOS)] were compared in 109 patients before and after coronary angioplasty and at follow-up coronary angiography. Correlation coefficients were low and 95% limits of agreement were wide. In general, CMS exhibited a tendency to yield lower values for very small diameters and higher values for larger vessels. The acute gain in minimal luminal diameter was considerably smaller when assessed by AWOS as compared to Polytron (0.52 vs. 0.71 mm, P < .0001) and to CMS (0.52 vs. 0.75 mm, P < .0001). Long-term gain was much larger when assessed by Polytron as compared to AWOS (18.8 vs. 11.5%, P < .001) and it was almost double for CMS as compared to AWOS (20.7 vs. 11.5%, P < .0001). In conclusion, in the individual patient very different results can be obtained when different QCA systems are used, and systematic differences between the systems are encountered.