Effect of Cervical Block on Recurrent Laryngeal Nerve Monitoring During Thyroid Surgery

Inclusion Criteria: * Patients over 18, able to give consent after clear and fair information * Affiliated to social security * Total thyroidectomy performed in the context of Graves' disease in biological euthyroidism with the need for surgical treatment (pregnancy project, fluctuating TSH, etc.), or multiheteronodular goiter with suspect or compressive nodules, or lobo-isthmectomy * No previous homolateral cervical surgery * Professional activity * Telephone line (at home or cellular) Exclusion Criteria: * Patients over 18 under legal protection * Allergy to local anesthetics * Existence of preoperative laryngeal dysphonia or paralysis * Patient with a submerging goiter (lower edge of the thyroid not seen on the preoperative cervical ultrasound) * Presence of uncontrolled infectious pathology * Pregnant or breastfeeding woman or no contraception * Lymph node dissection planned or patient at high risk of lymph node dissection (BETHESDA 5 and 6)