ESPE Abstracts (2019) 92 P1-152

Thyroid Function Following Hemithyroidectomy in a Pediatric Cohort

Patricia Papendieck, Maria Eugenia Masnata, Ignacio Bergada, Ana Chiesa

Centro de Investigaciones Endocrinológicas "Dr. César Bergadá" (CEDIE) CONICET – FEI – División de Endocrinología, Hospital de Niños Ricardo Gutiérrez,, Buenos Aires, Argentina

Background: Studies about thyroid function following hemithyroidectomy are scarce in the literature and no studies include pediatric population.

Objective: To describe thyroid function in pediatric patients who underwent a hemithyroidectomy.

Design: Retrospective cohort study.

Patients and Methods: Among the 38 patients who underwent hemithyroidectomy from 2006 to 2018, a total of 24 patients with available data who were followed up for more than a year and who were free of treatment at consultation were included in the analysis.

All patients were analyzed for age, sex, surgical indication and final pathologic analysis. Thyroid function (TSH, free T4 (fT4) and antithyroid antibodies (Ab)) were measured preoperative (P1) and postoperative (1-3 (P2) and 12-36 (P3) months). Paired Anova test was performed to evaluate TSH and fT4 levels (p <.05).

Results: Median age at surgery was 13.4years (r:3.3-17.7), 21 patients were female (87%). Pathologic analysis showed 10 follicular adenomas, 12 nodular hyperplasia and 2 suppurative thyroiditis. 2/24 showed positive thyroid antibodies. At P1 all the patients were euthyroid except 2 who were hyperthyroid and were excluded. 22 patients were evaluated at P2: 3 patients with a TSH>10mIU/L (overt hypothyroidism) and 7 with TSH 5-10 mIU/L were assumed as subclinical hypothyroidism with different criteria and initiated replacement with LT4 (only 1 was reevaluated 6 years after showing a normal thyroid function). The remaining 12 patients who were not treated (final cohort) were reevaluated at a minimum of 12 months after surgery (P3). Median TSH and fT4 at P1 were 1.2 mIU/L (r:0.8-2.2) and 1.2 ng/dl (r: 1-1.9 ), respectively. TSH at P2 showed a significant elevation when compared to TSH at P1 (P<.05). TSH at P3 showed a significant decline when compared to TSH at P2 (P<.05). TSH at P3 showed no difference to TSH at P1. FT4 was normal at P1, P2 and P3 showing no differences between them.

Conclusions: Thyroid function in this cohort of 12 pediatric patients who were not treated after hemithyroidectomy had transient thyroid function changes characterized by a significant elevation of TSH at P2 and a significant decline at P3 – reaching similar levels to that observed at P1- with a stable fT4 suggesting an adaptive response. Even when our cohort is too small, our results could suggest that the replacement with LT4 for subclinical hypothyroidism should be determined in a more cautious manner considering that the elevation of TSH < 10 mIU/l with normal fT4 can spontaneously normalize in further controls.

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