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Long-term prognostic value of low-dose normal stress-only myocardial perfusion imaging by wide beam reconstruction: A competing risk analysis

Abstract

Background

A normal stress myocardial perfusion single-photon emission computed tomography (MPS) is associated with a good clinical outcome. New iterative algorithms, such as wide beam reconstruction (WBR), which improve image interpretation with half-dose or half-time acquisition, have been proposed for cardiac MPS. The aim of this study was to assess the long-term predictive value of a low-dose normal stress-only MPS with WBR using conventional Anger camera in patients with known or suspected coronary artery disease (CAD).

Methods and Results

A total of 2106 patients with known or suspected CAD and normal perfusion at half-dose stress-only MPS protocol were followed for a mean of 6.6 ± 2.7 years. MPS data were reconstructed with WBR iterative algorithm. End-point events were cardiac death or nonfatal myocardial infarction. Noncardiac death was considered the competing event. During follow-up, 149 cardiac events occurred with an annualized event rate of 1.2%. Independent predictors of cardiac events at Cox analysis were age, male gender, diabetes mellitus, previous myocardial infarction and the need for pharmacologic stress testing. At Fine-Gray analysis the cumulative incidence of cardiac events progressively increases with age and in the presence of diabetes for any combination of gender and stress type. Survival tree analysis confirmed that long-term prognosis considerably varies according of risk factors profile.

Conclusions

Low-dose normal stress-only WBR MPS has a reliable long-term prognostic value in patients with suspected or known CAD. This finding supports the introduction of such a method into clinical practice with a consistent dose optimization in the interest of patients and exposed staff.

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Abbreviations

MPS:

Myocardial perfusion single-photon emission computed tomography

CAD:

Coronary artery disease

WBR:

Wide beam reconstruction

ECG:

Electrocardiography

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Disclosure

C. Nappi, W. Acampa, E. Nicolai, S. Daniele, E. Zampella, R. Assante, V. Gaudieri, T. Mannarino, M. Petretta, A. Cuocolo declare that they have no conflict of interest.

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Correspondence to Alberto Cuocolo MD.

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Nappi, C., Acampa, W., Nicolai, E. et al. Long-term prognostic value of low-dose normal stress-only myocardial perfusion imaging by wide beam reconstruction: A competing risk analysis. J. Nucl. Cardiol. 27, 547–557 (2020). https://doi.org/10.1007/s12350-018-1373-x

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Keywords

  • SPECT
  • MPI
  • diagnostic and prognostic application