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Accurate measures of left ventricular ejection fraction using electron beam tomography: A comparison with radionuclide angiography, and cine angiography

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Abstract

Background: Quantitative determination of ejection fraction is predicated on precise measurement of end-diastolic and end-systolic volumes of the left ventricle. Contrast enhanced electron beam tomography (EBT), with excellent temporal and spatial resolution, has the potential for highly accurate measures of ejection fraction. Methods: EBT protocol used a short axis scan of the left ventricle (8–12 levels, apex to base) during infusion of iodinated contrast. To assess the accuracy of the measured left ventricular ejection fraction (LVEF), we compared EBT with first-pass radionuclide angiography (RNA) and cine angiography (CINE). Results: A total of 41 patients (26 men and 15 women) underwent all three tests within 1 week. Resting ejection fraction using each modality was assessed in a linear regression model to assess inter-test correlation with the other two modalities. Correlation between CINE and EBT was high (r = 0.90, intercept 4.67, p < 0.001). Similarly, correlation of CINE and RNA (r = 0.87, intercept −5.48, p < 0.001) and between EBT and RNA (r = 0.87, intercept −4.6, p < 0.001) were high. In a subset of those patients with LVEF ≤ 40%, correlation was consistently high between EBT and CINE. However, correlations were poor for the comparisons between RNA and CINE (r = 0.40), and between the RNA and EBT (r = 0.47). The mean differences of measured ejection fractions between each of the imaging modality were small. However, there was only modest agreement between each of the comparisons as measured using 95% confidence interval (CI) on Bland–Altman plots. Conclusion: These data indicate that the LVEF results are comparable among EBT, RNA, and CINE and can be used interchangeably to assess ventricular function for LVEF > 40%. For LVEF ≤ 40%, we demonstrated some disparate results between cine angiography and RNA and between EBT and RNA, indicating that CINE or EBT may provide more accurate assessment.

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Authors and Affiliations

  1. Harbor-UCLA Medical Center, USA

    Howard K. Baik, Matthew J. Budoff, Kathleen L. Lane, Hamid Bakhsheshi & Bruce H. Brundage

  2. The Saint John's Cardiovascular Research Center, Torrance, California, USA

    Howard K. Baik, Matthew J. Budoff, Kathleen L. Lane, Hamid Bakhsheshi & Bruce H. Brundage

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  1. Howard K. Baik
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  2. Matthew J. Budoff
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  3. Kathleen L. Lane
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  4. Hamid Bakhsheshi
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  5. Bruce H. Brundage
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Baik, H.K., Budoff, M.J., Lane, K.L. et al. Accurate measures of left ventricular ejection fraction using electron beam tomography: A comparison with radionuclide angiography, and cine angiography. Int J Cardiovasc Imaging 16, 391–398 (2000). https://doi.org/10.1023/A:1026536510821

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