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The Influence of Heart Rate and Coronary Calcification on the Diagnostic Accuracy of 64-slice Multidetector Cardiac CT in Coronary Artery Disease

심박동수 및 관상동맥 석회화가 64 절편 다중검출기 심장 CT의 관상동맥 질환 진단일치도에 미치는 영향

  • 강영한 (대구가톨릭대학교병원 영상의학과) ;
  • 박종삼 (대구보건대학 방사선과)
  • Received : 2009.08.31
  • Accepted : 2009.11.06
  • Published : 2009.12.28

Abstract

Purpose : This study was to investigate the influence of heart rate and coronary calcification on diagnostic accuracy of 64-slice multidetector CT(MDCT) in coronary artery disease. Methods : 178 patients(84 men, 94 women) undergoing cardiac CT were included in this study. 3 coronary arteries(LAD, LCX, RCA) were assessed the presence of significant stenosis($\geq50%$) and the results compared with those of coronary angiography. Results : On a patient-based analysis, the diagnostic accuracy of 64-slice MDCT was 96.6%. The diagnostic accuracy on left anterior descending, left circumflex, right coronary artery were 86.5%, 84.3%, 92.1% respectively. Body mass index and blood pressure were not influenced on diagnostic accuracy of 64-slice MDCT. In less than 60/min of heart rate, accuracy was 90.1% and $\kappa$ value was 0.78. While in more than 70/min of heart rate, accuracy was 75.8% and $\kappa$ value was 0.52. In less than 100 of coronary calcification, accuracy was 91.3% and $\kappa$ value was 0.81. While in more than 400, accuracy was 68.6% and $\kappa$ value was 0.33. Conclusion : 64-slice MDCT shows similar diagnostic accuracy as coronary angiography. But in the context of more than 70/min of heart rate and 400 of coronary calcification, diagnostic accuracy was decreased. So there needs to identify heart rate and coronary calcification in cardiac CT, and if heart rate shows more than 70/min, use beta-blocker to regulate it.

Keywords

64-slice Multidetector CT;Coronary Artery Disease;Heart Rate;Coronary Calcification

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