Abstract
Background
To determine the capability of 99mTc-DPD scintigraphy to detect early cardiac involvement and predict clinical worsening in transthyretin (TTR) gene mutation patients.
Methods
Eleven mutated subjects with normal interventricular septum (IVS) thickness, NT-proBNP level and no cardiac symptoms underwent three seriate 99mTc-DPD scans (visually and semiquantitatively analyzed), and was followed-up for 5-8-years.
Results
Six patients showed no myocardial accumulation in all scans. Increased IVS thickness occurring in one patient 4 years after the last scan was the only abnormal finding in these patients; no cardiac symptoms developed during the follow-up. In three patients, cardiac radiotracer uptake was found at enrollment; other laboratory/instrumental abnormal findings occurred later and cardiac symptoms developed during the follow-up period. Two patients had a negative 99mTc-DPD scan at enrollment and showed cardiac uptake in the following scans. Increased mean left-ventricular (LV) wall thickness was found 3 years after positive scintigraphy; NT-proBNP increased later in one patient. These patients developed cardiac symptoms during the follow-up period.
Conclusions
99mTc-DPD scan detects cardiac involvement in subjects with TTR gene mutation earlier than ECG, echocardiography and biochemical markers, occurring some years before the fulfillment of current diagnostic criteria for cardiac amyloidosis. A positive 99mTc-DPD scan predicts cardiac symptoms onset.
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Abbreviations
- TTR:
-
Transthyretin
- IVS:
-
Interventricular septum
- Hattr:
-
Hereditary transthyretin-related amyloidosis
- FAP:
-
Familial amyloid polyneuropathy
- FAC:
-
Familial amyloidotic cardiomyopathy
- DPD:
-
3,3-diphosphono-1, 2-propanodicarboxylic acid
- NT-proBNP:
-
N-terminal pro-B-type natriuretic peptide
- PYP:
-
Pirophosphate
- ECG:
-
Electrocardiogram
- EF:
-
Ejection fraction
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Disclosure
Minutoli F, Di Bella G, Mazzeo A, Laudicella R, Gentile L, Russo M and Baldari S have nothing to disclose and they have no relevant or material financial interests that can relate to the research described in this paper. Vita G. discloses having been on advisory board for Alnylam Therap., Akcea Therap, and Pfizer. He is also principal investigator in clinical trials sponsored by Alnylam Therap and Ionis Therap.
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All procedures performed in studies involving human participants were in accordance with ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Minutoli F, Di Bella G, Mazzeo A, Laudicella R, Gentile L, Russo M, Vita G and Baldari S declare that they did not receive any financial support for this study.
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Minutoli, F., Di Bella, G., Mazzeo, A. et al. Serial scanning with 99mTc-3, 3-diphosphono-1, 2-propanodicarboxylic acid (99mTc-DPD) for early detection of cardiac amyloid deposition and prediction of clinical worsening in subjects carrying a transthyretin gene mutation. J. Nucl. Cardiol. 28, 1949–1957 (2021). https://doi.org/10.1007/s12350-019-01950-2
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DOI: https://doi.org/10.1007/s12350-019-01950-2