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Health Status, Psychological Symptoms, Mood, and Cognition in L-Thyroxine-Treated Hypothyroid Subjects

Samuels, Mary H., Schuff, Kathryn G., Carlson, Nichole E., Carello, Phyllis, Janowsky, Jeri S.·2007·Thyroid

Abstract

Objective Many hypothyroid subjects receiving L-thyroxine (L-T4) complain of psychological symptoms or cognitive dysfunction. However, there is limited validated information on these self-reports. Design Cross-sectional comparison of 20 euthyroid and 34 treated hypothyroid subjects, aged 20-45 years, with normal thyroid-stimulating hormone (TSH) levels. Subjects underwent the following validated measures: Short Form 36 (SF-36); Symptom Checklist 90-Revised (SCL-90-R); Profile of Mood States (POMS); and tests of declarative memory (Paragraph Recall, Complex Figure), working memory (N-Back, Subject Ordered Pointing, Digit Span Backwards), and motor learning (Pursuit Rotor). Main outcomes L-T4-treated subjects had higher mean TSH and free T4 levels, but free triiodothyronine (T3) levels were comparable to controls. L-T4-treated subjects had decrements on SF-36 and SCL-90-R summary scales and subscales. These subjects performed slightly worse on N-Back and Pursuit Rotor tests. Neither TSH nor thyroid hormone levels were associated with performance on psychological or cognitive measures. Conclusions This group of L-T4-treated subjects had decrements in health status, psychological function, working memory, and motor learning compared to euthyroid controls. Higher mean TSH levels suggest this may be related to suboptimal treatment, although there were no correlations between TSH levels and outcomes. These findings are limited by potential selection bias, and randomized studies targ…

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Crossref · 10.1089/thy.2006.0252

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  • For some patients, the success of LT4 was limited by persistence of residual cognitive symptoms and decrements in quality of life.

    “For some patients, however, the success story was limited by the persistence of residual cognitive symptoms and decrements in the quality of life (5–7).”

    From Emerging Therapies in Hypothyroidism (2024) · cites this paper as [7]

  • A minority of patients with hypothyroidism remain symptomatic despite normalization of serum thyrotropin levels.

    “However, a minority of the patients remain symptomatic despite the normalization of serum thyrotropin levels.”

    From Emerging Therapies in Hypothyroidism (2024) · cites this paper as [7]

  • In a US study, 34 L-T4-treated subjects had decrements in health status, psychological function, working memory, and motor learning compared to 22 euthyroid controls, with no correlations between serum TSH levels and outcomes.

    “In a study from the USA recruiting women mostly by advertisement, 34 L-T4treated subjects had decrements in health status, psychological function, working memory, and motor learning compared to 22 euthyroid controls.There were no correlations between serum TSH levels and outcomes [16] .”

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Authors
Samuels, M. H., Schuff, K. G., Carlson, N. E., Carello, P., & Janowsky, J. S.
Affiliations
Oregon Health & Science University (US)
Venue
Thyroid
Published
2007-03
Volume
17
Issue
3
Pages
249-258
ISSN
  • 1050-7256 (ISSN-L)
  • 1557-9077
OpenAlex
W2033152833
Cited by
124
References
67
Citations by year
2025: 7 · 2024: 3 · 2023: 9 · 2022: 5 · 2021: 10 · 2020: 9 · 2019: 6 · 2018: 8 · 2017: 2 · 2016: 9 · 2015: 8 · 2014: 13 · 2013: 10 · 2012: 6
FWCI
3.90
Type
journal article
Language
en
Open access
closed
Locations
  • Thyroid (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Diabetes and Digestive and Kidney Diseases (R21DK062787)
  • National Center for Research Resources (M01RR00334, M01RR000334)
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 › Thyroid Cancer Diagnosis and Treatment
Keywords
hypothyroidism, levothyroxine, thyroid hormone replacement, psychological symptoms, mood, cognitive function, working memory, motor learning, health status, thyroid-stimulating hormone, free triiodothyronine, young adults
MeSH terms
Adult, Affect, Cognition, Female, Humans, Hypothyroidism, Memory, Middle Aged, Motor Skills, Neuropsychological Tests, Thyroid Gland, Thyroid Hormones, Thyrotropin, Thyroxine, Case-Control Studies

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