Abstract
Background
Pyrophosphate (PYP) scintigraphy provides high diagnostic accuracy for the detection of transthyretin (ATTR) cardiac amyloidosis (CA). There has recently been emerging interest in using 18F-sodium fluoride (NaF) for this application, yet its sensitivity has never been directly compared to that of PYP, the current molecular gold standard
Methods
Twelve subjects with ATTR-CA and 5 controls referred for PYP-SPECT were prospectively enrolled. 18F-NaF PET/CT scans were performed at 1 and 3 hours. Qualitative and quantitative analyses of the images were performed, and the sensitivity of 18F-NaF PET/CT and PYP-SPECT were compared
Results
Visual interpretation of NaF PET/CT yielded a sensitivity of 0.25 (95% CI 0.089 to 0.53) for the detection of ATTR-CA, which is significantly inferior to that of PYP-SPECT/CT (100%, P = .016). Visual interpretation at 3 hours yielded a similar sensitivity of 0.30 (95% CI 0.11 to 0.60, P = 1.00). There were no false-positive NaF PET studies. Mean target-to-background ratio (TBRmean) at 1h did not differ significantly (P = .21) in ATTR-CA subjects (0.83 ± 0.15) compared to controls (0.72 ± 0.15). Receiver operating characteristic (ROC) analysis yielded an area under the curve (AUC) of 0.69 ± 0.16 (95% CI 0.37 to 1.00, P = .23).
Conclusion
With qualitative and quantitative analyses, sensitivity of NaF PET/CT is significantly inferior to that of PYP-SPECT for the diagnosis of ATTR-CA
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Abbreviations
- CA:
-
Cardiac amyloidosis
- AL:
-
Light-chain
- ATTR:
-
Transthyretin
- DPD:
-
99mTc-3,3-diphosphono-1,2-propanodicarboxylic acid
- EMB:
-
Endomyocardial biopsy
- LVH:
-
Left ventricular hypertrophy
- MBF:
-
Myocardial blood flow
- NaF:
-
Sodium fluoride
- PYP:
-
Pyrophosphate
- SUV:
-
Standard uptake value
- TBR:
-
Target-to-background ratio
- SRS:
-
Summed rest score
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Acknowledgment
M.P.-G. is supported by a Junior 1 Research Award from the Fonds de Recherche du Québec – Santé (FRQS).
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Zhang, L.X., Martineau, P., Finnerty, V. et al. Comparison of 18F-sodium fluoride positron emission tomography imaging and 99mTc-pyrophosphate in cardiac amyloidosis. J. Nucl. Cardiol. 29, 1132–1140 (2022). https://doi.org/10.1007/s12350-020-02425-5
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DOI: https://doi.org/10.1007/s12350-020-02425-5