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April 18, 2026Open Access

Semi-quantitative evaluation of early phase 99mTc-DPD scintigraphy in patients with suspected cardiac amyloidosis

Puntos clave

The study aims to evaluate the accuracy of early semi-quantitative parameters in 99mTc-DPD scintigraphy for diagnosing cardiac amyloidosis.
Retrospective analysis of 122 patients with suspected cardiac amyloidosis

PICO estructurado

Does early phase semi-quantitative 99mTc-DPD scintigraphy accurately diagnose cardiac amyloidosis and predict late-phase Perugini scores in patients with suspected cardiac amyloidosis?

Población

122 patients (78 male / 44 female) with suspected cardiac amyloidosis, mean age 74.4 years, based in Germany.

Intervención

Early phase planar whole-body 99mTc-DPD scintigraphy acquired 10 min (+ 5 min) post-injection, evaluated using semi-quantitative indices (H/WBr, H/WBp, H/S, H/M, H/CL, H/L, H/P).

Comparador

Late phase whole-body scintigraphy acquired 2.5-3.5 h post-injection (Perugini score) and standard diagnostic criteria (endomyocardial biopsy or Gillmore criteria).

Resultado

Diagnostic accuracy (sensitivity, specificity, accuracy, AUC) of early semi-quantitative parameters for predicting late Perugini score ≥1, Perugini score ≥2, and ATTR-CA.surrogate

Early-phase 99mTc-DPD scintigraphy lacks sufficient diagnostic precision to replace standard late-phase imaging for cardiac amyloidosis, though the novel Heart/Liver ratio provides high specificity.

Resumen

Scintigraphy using bone-avid tracers like 99mTc-diphosphono-propanodicarboxylic acid (99mTc-DPD), 99mTc-hydroxymethylene-diphosphonate (99mTc-HMDP), or 99mTc-pyrophosphate (99mTc-PYP) is a widely available and non-invasive imaging tool for diagnosis of cardiac amyloidosis. Visual evaluation and semi-quantitative image analyses reach excellent sensitivity and specificity results. For 99mTc-HMDP, high accuracy of early semi-quantitative parameters derived from imaging 10 min after tracer injection was described but never validated for other tracers. The aim of this study was to evaluate early semi-quantitative parameters in 99mTc-DPD scintigraphy. 122 patients (78 male / 44 female) with suspected cardiac amyloidosis who underwent 99mTc-DPD scintigraphy were retrospectively analysed. Early and late planar whole-body scintigraphy images were acquired 10 min (+ 5 min) and 2.5–3.5 h after tracer injection. Early cardiac 99mTc-DPD uptake was evaluated using the Heart/whole-body rectangular (H/WBr), Heart/whole-body profile (H/WBp), Heart/Skull (H/S), Heart/Mediastinum (H/M), Heart/Contralateral Lung (H/CL), Heart/Liver (H/L), and Heart/Pelvis (H/P) ratios. H/L was not correlated to the other parameters.Best results for prediction of Perugini ≥1 were achieved for H/M (sensitivity 69.6%, specificity 84.4%, accuracy 77.5%), best results for prediction of ATTR-CA for H/L (sensitivity 65.9%, specificity 88.6%, accuracy 80.8%). Adding the H/L to other parameters increased accuracy and specificity (best results for H/L+H/S: accuracy 83.3%, sensitivity 63.4%, specificity 93.7% to predict CA). Previous results for99mTc-HMDP were not confirmed; diagnostic precision of early 99mTc-DPD is not sufficient to replace late imaging in clinical routine. Early H/L is a novel, independent, and specific parameter which may be added to imaging protocols to increase the accuracy in combination with other imaging biomarkers

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