Pre-operative ultrasound identification of thyroiditis helps predict the need for thyroid hormone replacement after thyroid lobectomy

Pre-operative ultrasound identification of thyroiditis helps predict the need for thyroid hormone replacement after thyroid lobectomy

To evaluate whether pre-operative thyroiditis identified by ultrasound (US) could help predict the need for thyroid hormone replacement (THR) following thyroid lobectomy. Data from patients who underwent thyroid lobectomy in 2006-2011, were not taking THR pre-operatively, and had ≥1 month of follow-...

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Bibliographic Details
Published in:Endocrine practice Vol. 19; no. 6; p. 1015
Main Authors: Morris, Lilah F, Iupe, Isabella M, Edeiken-Monroe, Beth S, Warneke, Carla L, Hansen, Mandy O, Evans, Douglas B, Lee, Jeffrey E, Grubbs, Elizabeth G, Perrier, Nancy D
Format: Journal Article
Language:English
Published: United States 01-11-2013
Subjects:
Analysis of Variance
Databases, Factual
Female
Follow-Up Studies
Hormone Replacement Therapy - methods
Humans
Kaplan-Meier Estimate
Male
Middle Aged
Predictive Value of Tests
Regression Analysis
Retrospective Studies
Risk Assessment
Thyroid Hormones - therapeutic use
Thyroidectomy
Thyroiditis - complications
Thyroiditis - diagnostic imaging
Thyroiditis - surgery
Thyrotropin - blood
Ultrasonography
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Summary:To evaluate whether pre-operative thyroiditis identified by ultrasound (US) could help predict the need for thyroid hormone replacement (THR) following thyroid lobectomy. Data from patients who underwent thyroid lobectomy in 2006-2011, were not taking THR pre-operatively, and had ≥1 month of follow-up were reviewed retrospectively. THR was prescribed for relatively elevated thyroid-stimulating hormone (TSH) and hypothyroid symptoms. The Kaplan-Meier method was used to estimate the percentage of patients who required THR at 6, 12, 18, and 24 months postoperatively, and Cox proportional hazards regression models were used to evaluate prognostic factors for requiring post-thyroid lobectomy THR. During follow-up, 45 of 98 patients required THR. Median follow-up among patients not requiring THR was 11.6 months (range, 1.2 to 51.3 months). Six months after thyroid lobectomy, 22% of patients were taking THR (95% confidence interval [CI], 15-32%); the proportion increased to 46% at 12 months (95% CI, 36-57%) and 55% at 18 months (95% CI, 43-67%). On univariate analysis, significant prognostic factors for postoperative THR included a pre-operative TSH level >2.5 μ international units [IU]/mL (hazard ratio [HR], 2.8; 95% CI, 1.4-5.5; P = .004) and pathology-identified thyroiditis (HR, 2.4; 95% CI, 1.3-4.3; P = .005). Patients with both pre-operative TSH >2.5 μIU/mL and US-identified thyroiditis had a 5.8-fold increased risk of requiring postoperative THR (95% CI, 2.4-13.9; P<.0001). A pre-operative TSH level >2.5 μIU/mL significantly increases the risk of requiring THR after thyroid lobectomy. Thyroiditis can add to that prediction and guide pre-operative patient counseling and surgical decision making. US-identified thyroiditis should be reported and post-thyroid lobectomy patients followed long-term (≥18 months).
ISSN:1934-2403
DOI:10.4158/EP12334.OR