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Extracardiac soft tissue uptake, evidenced on early 99mTc-HMDP SPECT/CT, helps typing cardiac amyloidosis and demonstrates high prognostic value

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Abstract

Purpose

Increased cardiac uptake (CU) on early-phase 99mTc-HMDP scintigraphy has demonstrated diagnostic and prognostic values in amyloid transthyretin (ATTR) cardiac amyloidosis (CA). Extracardiac uptake (ECU) has been poorly studied. We assessed the clinical value of ECU, in combination with CU, on 99mTc-HMDP scintigraphy using a novel Methodological Amyloidosis Diagnostic Index (MADI).

Methods

We reviewed all patients referred for suspicion of CA, who underwent 99mTc-HMDP scintigraphy over an 8-year period. ECU, CU, and MADI were determined: MADI0 = neither ECU or CU, MADI1 = ECU alone, MADI2 = CU alone, and MADI3 = ECU + CU.

Results

Of 308 eligible patients, 247 had CA, including 75 ATTRv, 107 ATTRwt, and 65 light-chain (AL), while 61 had another cardiopathy (controls). ECU was observed in 29% of CA and 3% of controls. Most frequent sites of ECU were pleuropulmonary (16% of CA, 3% of controls) followed by the digestive tract and subcutaneous tissues. The liver and spleen ECU was only observed in AL-CA (n = 8). CU was only observed in CA patients (n = 187), of whom 182 had ATTR-CA vs. 5 AL-CA, P < 0.001. MADI0 was only observed in controls (97%) and in AL-CA (60%). MADI1 was mainly observed in AL-CA (positive predictive value, PPV = 91%) while MADI2/3 were more frequent in ATTR-CA (PPV = 97%), P < 0.0001. MADI > 0 vs. MADI0 in AL and MADI3 vs. MADI2 in ATTR were associated with a worse prognosis (P = 0.03 and P = 0.002, respectively).

Conclusions

ECU combined with CU demonstrates high diagnostic and prognostic values in CA patients. MADI seems an easy and reliable score in clinical practice.

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Abbreviations

AP-HP:

Assistance Publique – Hôpitaux de Paris

DHU A-TVB:

Département Hospitalo-Universitaire Ageing-Thorax Vessels Blood

ATTRv:

Amyloid transthyretin, variants

IMRB:

Institut Mondor de Recherche Biomédicale

INSERM:

Institut National de la Santé et de la Recherche Médicale

ATTRwt:

Amyloid transthyretin, wild-type

U-PEC:

Université-Paris Est Créteil

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Correspondence to Emmanuel Itti.

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Conflict of interest

Dr. Abulizi received a travel grant from GE Healthcare. Dr. Oghina received research grants from Pfizer. Dr. Funalot received honoraria and travel grants from Alnylam, Sanofi-Genzyme, and Pfizer. Dr. Bodez received honoraria from Alnylam and travel grants from Pfizer, Servier, and Novartis. Dr. Damy received research grants, financial grants (honoraria and speaking), and travel grants from Alnylam, GSK, AKCEA-Ionis, Pfizer, and Prothena. All other authors declare that they have no conflicts of interest.

Ethical approval

The study was conducted in accordance with the Helsinki declarations. All patients signed an informed written consent form. The study protocol was approved by our local ethics committee (CPP Ile-de-France IX, Créteil) and by the National Computer and Freedom Committee (CNIL - number 1431858). The data collection was approved by the Direction Régionale de la Recherche Clinique Ile-de-France (DC 2009-930).

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Malka, N., Abulizi, M., Kharoubi, M. et al. Extracardiac soft tissue uptake, evidenced on early 99mTc-HMDP SPECT/CT, helps typing cardiac amyloidosis and demonstrates high prognostic value. Eur J Nucl Med Mol Imaging 47, 2396–2406 (2020). https://doi.org/10.1007/s00259-020-04753-7

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