Abstract
Background
Transient ischemic dilation (TID) of the left ventricle seen on myocardial perfusion imaging (MPI) is sometimes used as a marker of severe coronary artery disease. The prognostic value of TID obtained using regadenoson, a selective adenosine A2A receptor agonist, as a stress agent for MPI has not been studied.
Methods
TID ratio was measured using an automated software program on consecutive patients with normal and abnormal perfusion pattern on regadenoson MPI at a single institution. An abnormal TID was defined as greater than 1.33. The primary outcome was a composite of cardiac death, non-fatal myocardial infarction (MI), and late coronary revascularization (CR, >90 days after MPI).
Results
The study population consisted of 887 patients (62 ± 12 years, 66% male, 48% diabetes, 46% prior CR, 75% with abnormal perfusion pattern, left ventricular ejection fraction—LVEF 55 ± 6%). An abnormal TID was present in 51 (6%) patients. Baseline characteristics were not different based on the presence or absence of TID. Early CR (≤90 days) was performed in 11 (22%) patients with vs 92 (11%) patients without TID (P = .04). During a mean follow-up of 29 ± 19 months, the primary outcome occurred in 271 (31%) patients (22% cardiac death, 6% MI, 9% late CR). TID was associated with increased risk of the primary outcome (log-rank P = .017), an association largely driven by late CR. In a Cox proportional model adjusted for multiple variables including perfusion defect size (PDS) and LVEF, the hazard ratio for TID was 1.92 (95% CI 1.20-3.08, P = .007). In the subset of patients with normal perfusion pattern, there was no association between TID and outcomes.
Conclusions
TID on regadenoson MPI carries important prognostic information that is independent from PDS and LVEF, but this association is restricted to patients with abnormal perfusion on imaging.
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Abbreviations
- CAD:
-
Coronary artery disease
- CR:
-
Coronary revascularization
- HR:
-
Hazard ratio
- LV:
-
Left ventricle
- LVEF:
-
Left ventricular ejection fraction
- MI:
-
Myocardial infarction
- MPI:
-
Myocardial perfusion imaging
- PDS:
-
Perfusion defect size
- TID:
-
Transient ischemic dilation
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Disclosures
Drs. Hage and Iskandrian have received research grants from Astellas Pharma USA.
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See related editorial, doi:10.1007/s12350-015-0299-9.
Davis Lester and Stephanie El-Hajj have contributed equally.
All editorial decisions for this article, including selection of reviewers and the final decision, were made by guest editor Alberto Cuocolo, MD.
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Lester, D., El-Hajj, S., Farag, A.A. et al. Prognostic value of transient ischemic dilation with regadenoson myocardial perfusion imaging. J. Nucl. Cardiol. 23, 1147–1155 (2016). https://doi.org/10.1007/s12350-015-0272-7
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DOI: https://doi.org/10.1007/s12350-015-0272-7