Abstract
Background
Exercise stress electrocardiography (ECG) alone is underutilized in part due to poor diagnostic accuracy. High-frequency QRS analysis (HF-QRS) is a novel tool to supplement ST evaluation during stress ECG. We compared the diagnostic accuracy and net reclassification of HF-QRS analysis compared with ST evaluation for substantial myocardial ischemia by exercise SPECT myocardial perfusion imaging (MPI).
Methods and Results
Exercise SPECT MPI was performed in 257 consecutive eligible patients (mean age 59 ± 12, 67% male). An ischemic HF-QRS pattern was defined as a ≥ 1 µV absolute reduction and a ≥ 50% relative reduction of the root-mean-square of the 150-250 Hz band signal in ≥ 3 leads. Left ventricular ischemia of ≥ 10% on SPECT MPI was the diagnostic standard for substantial myocardial ischemia. HF-QRS analysis demonstrated incremental diagnostic value to ST evaluation plus clinical risk factors (AUC 0.804 vs 0.749, P < .0001). A HF-QRS + ST -analysis strategy identified 92.3% of subjects with substantial ischemia and no abnormality in 59.9% of the cohort. No cardiac events occurred in patients without substantial ischemia identified by HF-QRS analysis.
Conclusions
In this prospective analysis, exercise stress ECG with HF-QRS analysis identified any and substantial ischemia with high diagnostic accuracy and may allow more than half of referred patients to safely avoid imaging.
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Abbreviations
- AUC:
-
Area under the curve
- CAD:
-
Coronary artery disease
- ECG:
-
Electrocardiography
- HF-QRS:
-
High-frequency QRS
- MAPHR:
-
Maximum age-predicted heart rate
- MPI:
-
Myocardial perfusion imaging
- SPECT:
-
Single-photon emission computed tomography
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Acknowledgements
This study was supported by a NIH Grants: K23- HL119620-02 (JMB) and T32-EB003841 (JAG, PCB and PWS).
Disclosure
Jamieson Bourque receives research Grant support from Astellas Pharma and consults with Pfizer. All other authors have no conflicts of interest to disclose.
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Jorge Gonzalez, Pelbreton Balfour, and Peter Shaw receive support from NIH-T32-EB003841. Jamieson Bourque receives support from NIH K23-HL119620-02.
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Balfour, P.C., Gonzalez, J.A., Shaw, P.W. et al. High-frequency QRS analysis to supplement ST evaluation in exercise stress electrocardiography: Incremental diagnostic accuracy and net reclassification. J. Nucl. Cardiol. 27, 2063–2075 (2020). https://doi.org/10.1007/s12350-018-01530-w
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DOI: https://doi.org/10.1007/s12350-018-01530-w