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Coronary risk equivalence of diabetes assessed by SPECT-MPI

Abstract

Background

Several publications and guidelines designate diabetes mellitus (DM) as a coronary artery disease (CAD) risk equivalent. The aim of this investigation was to examine DM cardiac risk equivalence from the perspective of stress SPECT myocardial perfusion imaging (MPI).

Methods and Results

We examined cardiovascular outcomes (cardiac death or nonfatal MI) of 17,499 patients referred for stress SPECT-MPI. Patients were stratified into four categories: non-DM without CAD, non-DM with CAD, DM without CAD, and DM with CAD, and normal or abnormal perfusion. Cardiac events occurred in 872 (5%), with event-free survival best among non-DM without CAD, worst in DM with CAD, and intermediate in DM without CAD, and non-DM with CAD. After multivariate adjustment, risk remained comparable between DM without CAD and non-DM with CAD [AHR 1.0 (95% CI 0.84–1.28), P =0.74]. Annualized event rates for normal subjects were 1.4% and 1.6% for non-DM with CAD and DM without CAD, respectively (P = 0.48) and 3.5% (P = 0.95) for both abnormal groups. After multivariate adjustment, outcomes were comparable within normal [AHR 1.4 (95% CI 0.98–1.96) P = 0.06] and abnormal [AHR 1.1 (95% CI 0.83–1.50) P = 0.49] MPI.

Conclusions

Diabetic patients without CAD have comparable risk of cardiovascular events as non-diabetic patients with CAD after stratification by MPI results. These findings support diabetes as a CAD equivalent and suggest that MPI provides additional prognostic information in such patients.

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Abbreviations

CAD:

Coronary artery disease

DM:

Diabetes mellitus

SPECT-MPI:

Single photon emission computed tomography myocardial perfusion imaging

SSS:

Summed stress score

MET:

Metabolic equivalent

AHR:

Adjusted hazard ratio

MI:

Myocardial infarction

ACC/AHA:

American College of Cardiology/American Heart Association

ACE:

Angiotensin converting enzyme

mCi:

Millicurie

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Disclosure

This evaluation was not funded, and the authors have no conflicts of interest to disclose.

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Correspondence to Donna Chelle V. Morales DO.

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Morales, D.C.V., Bhavnani, S.P., Ahlberg, A.W. et al. Coronary risk equivalence of diabetes assessed by SPECT-MPI. J. Nucl. Cardiol. 26, 1093–1102 (2019). https://doi.org/10.1007/s12350-017-1114-6

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  • DOI: https://doi.org/10.1007/s12350-017-1114-6

Keywords

  • diabetes mellitus
  • coronary artery disease equivalent
  • myocardial perfusion imaging