Hydrodissection and programmed stop sedation in 100 % of benign thyroid nodules treated with radiofrequency ablation.

To describe our group experience in treatment of benign symptomatic thyroid nodules using radiofrequency ablation technique always associated to routine pre-procedure hydrodissection and under sedation with programmed stop. Dual-center, retrospective study conducted between April 2018 and January 2020. A total of 52 symptomatic benign thyroid nodules were treated in 34 patients with ultrasound-guided percutaneous radiofrequency ablation. The technique of choice was moving-shot technique and 100 % patients underwent pre-procedural hydrodissection with 5% glucose solution, plus conscious sedation with programmed stop during procedure. Most nodules were solid or almost completely solid (n = 45, 88.3 % of nodules), followed by cystic composition (n = 4, 7.8 %) and mixed (n = 2, 3.9 %). As for location, most were on the right lobe (n = 29, 56.9 %), followed by the left lobe (n = 17, 33.3 %) and isthmus (n = 5, 9.8 %). The average volume of nodules before ablation was 18.2 ± 20.5 mL. Volumetric reduction rates at one, three, six and twelve months after ablation were 46.6 %, 64.5 %, 76.1 % and 88.8 %, respectively. No complications strictly related to procedure were reported. No more than 5 min were added to total time of ablative treatment considering routine hydrodissection and stop programmed sedation. Minimally invasive therapies applied to thyroid allow the preservation of healthy thyroid parenchyma and provide a very effective volumetric reduction of symptomatic benign thyroid nodules. Hydrodissection with 5 % glucose solution, conscious sedation and patient stimulation with programmed stop during procedure may provide greater safety to procedure, and, in our experience, could be done routinely in all patients.

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