Reproducibility of Intravenous Intermittent Triggered Myocardial Contrast Echocardiography in Healthy Subjects

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概要

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• Few data have been published on the reproducibility of baseline subtracted peak intensity obtained from intravenous intermittent triggered myocardial contrast echocardiography. We investigated the reproducibility of the peak intensity measured from intravenous intermittent triggered myocardial contrast echocardiography in 10 young healthy males. The contrast echocardiography was obtained using the second harmonic mode with an intravenous bolus injection of Levovist (first study). The same myocardial contrast echocardiography was repeated after the first study (second study). The myocardial opacification and peak intensity in the 12 segments of the apical 4 and 2 chamber views were assessed visually and quantitatively. The differences in the peak intensity between the initial and repeated measurements in the first study (intraobserver reproducibility) and between the initial measurements in the first and second studies (interinjection reproducibility) were assessed using the Bland and Altman method. The degree of opacification was good or intermediate in 207/228 (91%) of the segments. The agreement of myocardial opacification between the first and second studies was 87/114 (76%). However, significantly higher peak intensity was obtained in apical septal (8200 ± 6300 au2) and mid septal (8500 ± 6000 au2) segments in the 4 chamber view and in the mid inferior (12400 ± 9300 au2) and apical inferior (10700 ± 6300 au2) segments in the 2 chamber view compared with other segments. The mean differences of the peak intensities according to the Bland and Altman analysis was -1600 ± 5000 au2 in the intraobserver reproducibility study, and -1100 ± 5300 au2 in the interinjection reproducibility study. Thus, the measurement error was determined to range from 8400 au2 to 9500 au2 in both studies. We conclude that the peak intensity obtained from intravenous intermittent triggered myocardial contrast echocardiography using Levovist varies significantly among segments in the left ventricular myocardium. Large intraobserver and interinjection variability exists in the measurement of peak intensity, suggesting that the reproducibility of this technique is limited for quantitative assessment of myocardial perfusion.

• International Heart Journal刊行会の論文

著者

• OTSUJI Yutaka

  First Department of Internal Medicine, Faculty of Medicine, Kagoshima University

• Yoshifuku Shiro

  First Department of Internal Medicine, Kagoshima University School of Medicine

• Takasaki Kunitsugu

  First Department of Internal Medicine, Kagoshima University School of Medicine

• Minagoe Shinichi

  First Department of Internal Medicine, Kagoshima University School of Medicine

• Kisanuki Akira

  School Of Health Sciences Kagoshima University

• Kuwahara Eiji

  First Department of Internal Medicine

• Tei Chuwa

  First Department Of Internal Medicine Faculty Of Medicine Kagoshima University

• Otsuji Yutaka

  First Department Of Internal Medicine Faculty Of Medicine Kagoshima University

• Kisanuki Akira

  School of Health Sciences, Faculty of Medicine, Kagoshima University

• Yuasa Toshinori

  First Department of Internal Medicine, Faculty of Medicine, Kagoshima University

• Minagoe Shinichi

  First Department of Internal Medicine, Faculty of Medicine, Kagoshima University

• Yoshifuku Shiro

  First Department of Internal Medicine, Faculty of Medicine, Kagoshima University

• Kuwahara Eiji

  First Department of Internal Medicine, Faculty of Medicine, Kagoshima University

• Takasaki Kunitsugu

  First Department of Internal Medicine, Faculty of Medicine, Kagoshima University

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