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Treating thyroid nodules by radiofrequency: is the delivered energy correlated with the volume reduction rate? A pilot study

  • Endocrine Methods and Techniques
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Abstract

Objective

Radiofrequency ablation (RFA) was proven as effective in reducing thyroid nodules’ volume. However, whether technical procedure aspects could influence the volume reduction rate (VRR) has not been clarified. This retrospective pilot study aimed to analyze the correlation of RFA power, duration, and energy with VRR.

Methods

During the period from June to December 2018 two primary-care centers treated benign thyroid nodules of adult outpatients according to the same RFA procedure. Technical parameters to be investigated were the following: median power (Pmedian), effective time of treatment (Teff), energy calculated as Pmedian × Teff (Ecalc), and energy delivered per mL as Kcal × 4184 × nodule’s volume (Edel). Continuous variables were analyzed by the Mann–Whitney test. Data of 1-year posttreatment follow-up were collected on December 2019 and the correlation of the above parameters with VRR was analyzed by linear regression.

Results

Forty-one nodules were included and their 1-year VRR was 66.6%. RFA was performed with a Pmedian of 55 W, Teff 10.24 min, Ecalc 31,380 J, and Edel 1473 J/mL. Edel was significantly correlated with VRR (p = 0.014) while Pmedian, Teff, and Ecalc not. A strong correlation of Edel with VRR was found in nodules <10 mL (p = 0.001) while no significant correlation was observed in nodules >10 mL.

Conclusions

This study showed that the energy delivered with RFA is the only technical parameter significantly correlated with the VRR of thyroid nodules.

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Authors and Affiliations

  1. Clinic for Nuclear Medicine and Competence Center for Thyroid Diseases, Imaging Institute of Southern Switzerland, Ente Ospedaliero Cantonale, Bellinzona, Switzerland

    Pierpaolo Trimboli

  2. Faculty of Biomedical Sciences, Università della Svizzera Italiana (USI), Lugano, Switzerland

    Pierpaolo Trimboli

  3. Endocrinology, Diabetes and Metabolism Department and Center for Thyroid Diseases, A.O. Ordine Mauriziano, Turin, Italy

    Maurilio Deandrea

Authors
  1. Pierpaolo Trimboli
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  2. Maurilio Deandrea
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Correspondence to Pierpaolo Trimboli.

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The authors declare that they have no conflict of interest.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Also, for this retrospective study, formal consent was not required.

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Trimboli, P., Deandrea, M. Treating thyroid nodules by radiofrequency: is the delivered energy correlated with the volume reduction rate? A pilot study. Endocrine 69, 682–687 (2020). https://doi.org/10.1007/s12020-020-02275-8

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