Cited by 90Thyroid Disorders and TreatmentsThyroid and Parathyroid SurgeryAdrenal Hormones and Disorders

l-Thyroxine Requirement in Patients with Autoimmune Hypothyroidism and Parietal Cell Antibodies

Checchi, Serenella, Montanaro, Annalisa, Pasqui, Letizia, Ciuoli, Cristina, De Palo, Valentina, Chiappetta, Maria Celeste, Pacini, Furio·2008·The Journal of Clinical Endocrinology & Metabolism

Abstract

BACKGROUND: Hypothyroid patients on l-T(4) therapy may require replacement doses exceeding the theoretical needs to normalize serum TSH due to low patient compliance, drugs interference, and malabsorption. OBJECTIVE: We examined whether autoimmune gastritis might cause increased l-T(4) requirement in patients with autoimmune thyroiditis receiving l-T(4) replacement. PATIENTS: We studied 391 patients with clinical or subclinical hypothyroidism from autoimmune thyroiditis who had achieved normal serum TSH concentration (0.3-3.0 microU/ml) under l-T(4) for at least 6 months. Patients were screened for serum parietal cell antibodies (PCA) as a marker of autoimmune gastritis, and the PCA status was correlated with the l-T(4) dose. We also studied a group of 60 patients receiving l-T(4) replacement after total thyroidectomy. RESULTS: PCA-positive (155 of 391) and PCA-negative (236 of 391) patients did not differ for pretherapy serum TSH levels and thyroid volume. The l-T(4) requirement was significantly (P = 0.002) higher in PCA-positive (1.24 +/- 0.40 microg/kg x d) than in PCA-negative patients (1.06 +/- 0.36 microg/kg x d), and a significant positive correlation was found between l-T(4) requirement and serum PCA levels. Among PCA-positive patients, l-T(4) requirement was even higher in those with proven gastritis (1.52 +/- 0.40 microg/kg x d) compared with those without gastric damage (1.15 +/- 0.33 microg/kg x d) (P < 0.0001). The increased l-T(4) requirement was confirmed also in PCA-positive thyroidectomized patients (1.81 +/- 0.27 microg/kg x d) compared with PCA-negative thyroidectomized patients (1.52 +/- 0.24 microg/kg x d). Independent variables affecting l-T(4) requirement were PCA and serum TSH at diagnosis. CONCLUSIONS: Autoimmune gastritis is an additional factor affecting l-T(4) requirement in patients with autoimmune thyroiditis. Serum PCA measurement should be considered in patients with an unexplained high requirement of l-T(4).

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Crossref · 10.1210/jc.2007-1544

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Authors
Checchi, S., Montanaro, A., Pasqui, L., Ciuoli, C., De Palo, V., Chiappetta, M. C., & Pacini, F.
Affiliations
  • University of Siena (IT)
  • Section of Endocrinology and Metabolism, Department of Internal Medicine, Endocrinology and Metabolism and Biochemistry, University of Siena, 53100 Siena, Italy
Corresponding author
Pacini, Furio
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
2008-02-01
Volume
93
Issue
2
Pages
465-469
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W1983054324
Cited by
89
References
36
Citations by year
2025: 2 · 2024: 3 · 2023: 4 · 2022: 5 · 2021: 7 · 2020: 2 · 2019: 1 · 2018: 4 · 2017: 3 · 2016: 11 · 2015: 4 · 2014: 12 · 2013: 6 · 2012: 2
FWCI
4.38
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
  • Health Sciences › Medicine › Surgery › Thyroid and Parathyroid Surgery
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
Keywords
autoimmune hypothyroidism, autoimmune thyroiditis, parietal cell antibodies, autoimmune gastritis, thyroid hormone replacement, serum TSH, total thyroidectomy, subclinical hypothyroidism
MeSH terms
Adolescent, Adult, Aged, Aged, 80 and over, Autoantibodies, Child, Female, Gastritis, Humans, Hypothyroidism, Male, Middle Aged, Thyroiditis, Autoimmune, Thyrotropin, Thyroxine, Triiodothyronine, Cohort Studies, Statistics, Nonparametric, Hormone Replacement Therapy

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