Abstract
Background
The photon sensitivity and spatial resolution of single-photon emission-computed tomography (SPECT) has been significantly improved by solid-state camera systems using cadmium zinc telluride (CZT) detectors. While the diagnostic accuracy of these systems is well established, there is little evidence directly comparing the prognostic utility to conventional NaI cameras.
Methods and Results
Retrospective analysis of patients undergoing SPECT between 2008 and 2012. Visual SPECT assessment was performed utilizing the 17-segment model to determine summed stress scores (SSS). We identified 12,830 consecutive patients, mean age 63.2 ± 13.7 and 56.1% male, 5072 of whom underwent CZT and 7758 NaI imaging. During a median follow-up duration of 7.0 years (IQR 5.5-8.2), a total of 2788 (21.7%) patients died. Compared to SSS 0, minimal perfusion abnormality (SSS 1-3) was associated with increased all-cause mortality with CZT camera (adjusted HR 1.32, P = .017) and NaI camera (adjusted HR 1.29, P = .001, interaction P = .803). Increasing stress abnormality was associated with a similar increase in risk with CZT or NaI imaging (interaction P > .500). In a propensity matched analysis, patients with normal perfusion stress perfusion assessed with a CZT was associated with decreased mortality compared to normal perfusion assessed by a NaI camera system (hazard ratio .88, 95% CI .78-.99, P = .040).
Conclusions
Increasing stress perfusion abnormality was associated with similar increase in all-cause mortality with CZT or NaI cameras. CZT and NaI camera systems provide similar risk stratification, however, normal myocardial perfusion may be associated with a more benign prognosis when assessed with a CZT camera system.
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Abbreviations
- BMI:
-
Body mass index
- CABG:
-
Coronary artery bypass grafting
- CAD:
-
Coronary artery disease
- CZT:
-
Cadmium zinc telluride
- HR:
-
Hazard ratio
- IQR:
-
Interquartile range
- LV:
-
Left ventricle
- LVEF:
-
Left ventricular ejection fraction
- MPI:
-
Myocardial perfusion imaging
- NaI:
-
Sodium iodide
- PCI:
-
Percutaneous coronary intervention
- SD:
-
Standard deviation
- SRS:
-
Summed rest score
- SSS:
-
Summed stress score
- SPECT:
-
Single-photon emission computed tomography
- TID:
-
Transient ischemic dilation
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Drs. Berman, and Slomka participate in software royalties for QPS/QGS software at Cedars-Sinai Medical Center.
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The work was supported in part by the Dr. Miriam and Sheldon G. Adelson Medical Research Foundation.
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Miller, R.J.H., Han, D., Rozanski, A. et al. CZT camera systems may provide better risk stratification for low-risk patients. J. Nucl. Cardiol. 28, 2927–2936 (2021). https://doi.org/10.1007/s12350-020-02128-x
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DOI: https://doi.org/10.1007/s12350-020-02128-x