Korean Journal of Radiology

The Korean Society of Radiology (대한영상의학회)
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Diagnostic Accuracy of Electrocardiogram-Gated Thoracic Computed Tomography Angiography without Heart Rate Control for Detection of Significant Coronary Artery Stenosis in Patients with Acute Ischemic Stroke: A Comparative Study

  • Song, Inyoung (Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine) ;
  • Kang, Ji Hun (Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine) ;
  • Kim, Mi Young (Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine) ;
  • Hwang, Hweung Kon (Department of Cardiology, Konkuk University Medical Center, Konkuk University School of Medicine) ;
  • Kim, Han Young (Department of Neurology, Konkuk University Medical Center, Konkuk University School of Medicine) ;
  • Ko, Sung Min (Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine)
  • Received : 2017.08.26
  • Accepted : 2018.03.03
  • Published : 2018.10.01
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Abstract

Objective: To compare the diagnostic performance of electrocardiogram (ECG)-gated thoracic computed tomography angiography (TCTA) without heart rate (HR) control in ischemic stroke patients with coronary CTA (CCTA) in non-stroke patients for detection of significant coronary artery stenosis. Materials and Methods: From September 2009 through August 2014, we retrospectively enrolled 138 consecutive patients diagnosed with acute ischemic stroke who had undergone ECG-gated TCTA and conventional coronary angiography (CCA). Over the same period, we selected 167 non-stroke patients with suspected or known coronary artery disease who had undergone CCTA and CCA. With CCA as the reference standard, the diagnostic performance of TCTA and CCTA for identification of significant coronary stenosis (diameter reduction ${\geq}50%$) was calculated. Results: There was no significant difference in baseline characteristics between TCTA (n = 132) and CCTA (n = 164), except for the higher prevalence of atrial fibrillation in the stroke group. There was significant difference (p < 0.001) between TCTA and CCTA in average HR ($68{\pm}12$ vs. $61{\pm}10$ beats per minute) and image quality score ($1.3{\pm}0.6$ vs. $1.2{\pm}0.6$). Significant coronary stenosis was identified in 101 (77%) patients, 179 (45%) vessels, and 293 (15%) segments of stroke patients, and in 136 (83%) patients, 259 (53%) vessels, and 404 (16%) segments of non-stroke patients. Diagnostic performance on a per-vessel and per-patient basis was similar in both TCTA and CCTA groups. There was only significant difference in area under receiver-operating characteristic curve between TCTA and CCTA groups (0.79 vs. 0.87, p < 0.001) on per-segment basis. Conclusion: Electrocardiogram-gated TCTA without HR control facilitates the identification of significant coronary stenosis in patients with ischemic stroke.

Keywords

Acknowledgement

Supported by : Konkuk University Medical Center

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