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KMID : 1103720120660030221
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Journal of the Korean Society of Radiology
2012 Volume.66 No. 3 p.221 ~ p.228
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Variation of the Degree of Coronary Artery Stenosis during the Cardiac Cycle: Influence of Heart Rate or Calcium Score on Coronary CT Angiography
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Lee Hyun-Kyung
Jin Gong-Yong
Park Jae-Keun
Han Young-Min
Lee Young-Sun
Cha Seong-Jae
Kim Song-Soo
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Abstract
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Purpose: To assess the stenotic coronary artery diameter in systole and end-diastole by coronary CT angiography and to evaluate the change in diameter according to heart rate and calcium score.
Materials and Methods : Twenty-seven patients with coronary artery stenosis that underwent a coronary CT angiography and invasive coronary angiography were enrolled in the study. We assessed the percentage of diameter change in the stenotic coronary artery between the systolic and end-diastolic phase and evaluated its relationship with heart rate or Agatston score using a linear regression analysis.
Results: The mean difference in the change of vessel diameter was 12.9% for a heart rate of 50?59 beats/min (bpm), 11.3% for 60?69 bpm, 10% for 70?79 bpm, 20% for 80?89 bpm, 13% for 90?99 bpm, and 6.7% for 100?109 bpm, none of which were statistically significant (p = 0.760). For the Agatston score, the mean difference in the change of vessel diameter was 8.3% for a score < 100, 12.4% for 100-400, and 20% for > 400. The relationship between the change in diameter and Agatston score was statistically significant (p = 0.004).
Conclusion: The data suggest that a change in diameter of the stenotic coronary artery in systole and end-diastole might be affected by the Agatston score.
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KEYWORD
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Diagnosis, Computer-Assisted, Dual Source Computed Tomography, Coronary Angiography, Coronary Stenosis
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