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Identification of advanced coronary artery disease with exercise myocardial perfusion imaging: the clinical value of a novel approach for assessing lung thallium-201 uptake

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Abstract

Introduction

The precise clinical utility of lung 201Tl uptake in exercise SPECT myocardial perfusion imaging remains open to research. This study validates an optimal index for lung 201Tl uptake measurement and assesses its value in the prediction of higher-risk coronary artery disease (CAD).

Method

Three hundred and ninety-eight patients underwent exercise SPECT myocardial perfusion imaging. They were separated into derivation (n = 217) and validation (n = 186) groups, both including sub-populations of lower- and higher-risk CAD, according to coronary angiography. Another 56 individuals with a low probability of CAD comprised the control group. From a planar, anterior, post-exercise acquisition, the lung (L) to heart (H) maximal (L/Hmax), total (L/Hmean) and background-subtracted total (L/Hnet) ratios were calculated. These were also adjusted for confounding variables, as assessed from the control group. ROC analysis was used to compare the L/H ratios and define thresholds of abnormality. The performance of the optimal index was assessed in the derivation group and was then tested in the validation population. Subsequently, it was compared with other scintigraphic, exercise electrocardiography and clinical variables.

Results

In the derivation group L/Hnet was a better discriminator for higher-risk CAD than both L/Hmax and L/Hmean. Similarly, the adjusted L/Hnet was a better discriminator than both the adjusted L/Hmax and the adjusted L/Hmean. No significant difference was attained between L/Hnet and the adjusted L/Hnet. At the upper defined threshold of abnormality, sensitivity and specificity of L/Hnet in the detection of higher-risk CAD in the derivation and the validation cohorts were 52% and 92% versus 47% and 94%, respectively (p =  ns). The results were similar at other defined thresholds. Moreover, L/Hnet was found to be a significant predictor of higher-risk CAD, superior to myocardial perfusion images, transient ventricular dilation measurements, and clinical and exercise testing variables (ROC analysis and logistic regression). By raising the threshold of abnormality of L/Hnet, specificity and positive predictive value increased, whereas sensitivity and negative predictive value decreased.

Conclusion

Lung 201Tl assessment assists substantially in the identification of higher-risk CAD in exercise SPECT myocardial perfusion imaging and this is best achieved by L/Hnet. This index is a significant predictor of higher-risk CAD, superior to myocardial perfusion images, and its value is associated with the probability of a disease state.

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Authors and Affiliations

  1. Nuclear Medicine Department, Hippokration Hospital, 49 Konstantinoupoleos Str, Thessaloniki, 546 42, Greece

    Efstratios Moralidis & Georgios Arsos

  2. Hippokration Medical Center, Larissa, Greece

    Efstratios Moralidis & Tryfon Spyridonidis

  3. Nuclear Medicine Department, Royal Brompton Hospital, London, UK

    Constantinos Anagnostopoulos

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  1. Efstratios Moralidis
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  2. Tryfon Spyridonidis
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  3. Georgios Arsos
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  4. Constantinos Anagnostopoulos
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Correspondence to Efstratios Moralidis.

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Moralidis, E., Spyridonidis, T., Arsos, G. et al. Identification of advanced coronary artery disease with exercise myocardial perfusion imaging: the clinical value of a novel approach for assessing lung thallium-201 uptake. Eur J Nucl Med Mol Imaging 34, 573–583 (2007). https://doi.org/10.1007/s00259-006-0255-7

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