Abstract
Background and Aim
Either 99mTechnetium diphosphonate (Tc-DPD) or pyrophosphate (Tc-PYP) scintigraphy plays a relevant role in diagnosing transthyretin cardiac amyloidosis (CA), and labeled radiotracers have been extensively studied in diagnosing CA. Few studies have analyzed and validated 99mTc-Hydroxymethylene diphosphonate (Tc-HMDP). Our aim was to validate the diagnostic accuracy of Tc-HMDP total-body scintigraphy in a cohort of patients with biopsy-proven transthyretin CA.
Methods and Results
We retrospectively evaluated all patients undergoing 99mTc-HMDP total-body scintigraphy, in adjunct to a comprehensive diagnostic work-up for suspected CA. Sixty-five patients were finally diagnosed with CA, while it was excluded in 20 subjects with left ventricular hypertrophy of various etiologies. Twenty-six patients had AL-CA, 39 had TTR CA (16 TTRm, 23 TTRwt). At Tc-HMDP scintigraphy, 2 AL patients showed a Perugini score grade 1 heart uptake, while 24 showed no uptake. All TTR patients showed Tc-HMDP uptake, with three patients showing a Perugini score grade 1, 16 grade 2, and 20 grade 3, respectively. No uptake was observed in patients with left ventricular hypertrophy. A positive Tc-HMDP scintigraphy showed a 100% sensitivity and a 96% specificity for TTR CA identification.
Conclusions
Tc-HMDP scintigraphy is as accurate as Tc-DPD or Tc-PYP, and may therefore de facto be considered a valuable tool for the diagnosis of TTR CA.
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Abbreviations
- Tc-DPD:
-
99mTc-3,3-diphosphono-1,2-propanodicarboxylic
- Tc-PYP:
-
99m-Tc-Pyrophosphate
- Tc-HMDP:
-
99mTc-Hydroxymethylene diphosphonate
- NT-proBNP:
-
N-terminal fragment of pro-brain natriuretic peptide
- TTR CA:
-
Transthyretin cardiac amyloidosis
- AL CA:
-
Light chain cardiac amyloidosis
- LVH:
-
Left ventricular hypertrophy
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Cappelli, F., Gallini, C., Di Mario, C. et al. Accuracy of 99mTc-Hydroxymethylene diphosphonate scintigraphy for diagnosis of transthyretin cardiac amyloidosis. J. Nucl. Cardiol. 26, 497–504 (2019). https://doi.org/10.1007/s12350-017-0922-z
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DOI: https://doi.org/10.1007/s12350-017-0922-z