CZT camera systems may provide better risk stratification for low-risk patients

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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Correspondence to Daniel S. Berman MD.

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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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Funding

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. (2020). https://doi.org/10.1007/s12350-020-02128-x

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Keywords

  • SPECT
  • myocardial perfusion imaging
  • CZT