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• W2045017724 abstract "Background— Differentiating immunoglobulin light-chain (AL) from transthyretin-related cardiac amyloidoses (ATTR) is imperative given implications for prognosis, therapy, and genetic counseling. We validated the discriminatory ability of 99m Tc-pyrophosphate ( 99m Tc-PYP) scintigraphy in AL versus ATTR. Methods and Results— Forty-five subjects (12 AL, 16 ATTR wild type, and 17 ATTR mutants) underwent 99m Tc-PYP planar and single-photon positive emission computed tomography cardiac imaging. Scans were performed by experienced nuclear cardiologists blinded to the subjects’ cohort assignment. Cardiac retention was assessed with both a semiquantitative visual score (range, 0; no uptake to 3, diffuse uptake) and by quantitative analysis by drawing a region of interest over the heart corrected for contralateral counts and calculating a heart-to-contralateral ratio. Subjects with ATTR cardiac amyloid had a significantly higher semiquantitative cardiac visual score than the AL cohort (2.9±0.06 versus 0.8±0.27; P <0.0001) as well as a higher quantitative score (1.80±0.04 versus 1.21±0.04; P <0.0001). Using a heart-to-contralateral ratio >1.5 consistent with intensely diffuse myocardial tracer retention had a 97% sensitivity and 100% specificity with area under the curve 0.992, P <0.0001 for identifying ATTR cardiac amyloidosis. Conclusions— 99m Tc-PYP cardiac imaging distinguishes AL from ATTR cardiac amyloidosis and may be a simple, widely available method for identifying subjects with ATTR cardiac amyloidosis, which should be studied in a larger prospective manner." @default.
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• W2045017724 date "2013-03-01" @default.
• W2045017724 modified "2023-10-18" @default.
• W2045017724 title "^99m Tc-Pyrophosphate Scintigraphy for Differentiating Light-Chain Cardiac Amyloidosis From the Transthyretin-Related Familial and Senile Cardiac Amyloidoses" @default.
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• W2045017724 doi "https://doi.org/10.1161/circimaging.112.000132" @default.
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