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Plasma thyrotropin, thyroxine, triiodothyronine, free thyroxine, free triiodothyronine, and Cortisol levels in blind prepubertal boys

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Abstract

Findings on thyroid function in blind subjects are lacking. The aim of this study was to investigate the thyroid hormonal pattern in prepubertal blind subjects. Six healthy and 8 blind males, aged 7–10 yr, in Tanner stage one puberty, living at Institute “Martuscelli” for blind young subjects, Napoli, Italy, were studied. Each had a TRH (200 µg) test at 08:00 h after nocturnal rest. Plasma TSH, T4, T3, free T4(FT4), free T3(FT3) and cortisol (F) were measured by RIA. Our blind subjects show levels of TSH (basal values and absolute peak after TRH), T4, T3 and F normal but FT4 and FT3 levels significantly higher than controls (39 pg/ml ± 4.7 vs 12 ± 0.6, p< 0.001; 14 pg/ml ± 1.3 vs 4.7 ± 0.2, p< 0.001, respectively). Our results, similar to those found in some patients with euthyroid hyperthyroxinemia, suggest that the prolonged inability to receive light signal could influence the metabolism of thyroid hormones and/ or cause a tissue resistance to their action, even if this hypothesis must be verified by future more extensive investigations.

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Authors and Affiliations

  1. lstituto di Endocrinologia, I Facoltà di Medicina e Chirurgia, Università di Napoli, Italy

    Antonio Bellastella, T. Criscuolo, A. A. Sinisi, S. Iorio, F. Parlato & M. Faggiano

  2. Istituto “Martuscelli” per Giovani Ciechi, Napoli

    A. Mazzuca

  3. Dipartimento di Pediatria, Università di Napoli, 80100, Napoli, Italy

    L. Perrone

Authors
  1. Antonio Bellastella
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  2. T. Criscuolo
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  3. A. A. Sinisi
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  4. S. Iorio
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  5. A. Mazzuca
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  6. F. Parlato
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  7. L. Perrone
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  8. M. Faggiano
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Partially supported by grant from MPI, Rome, Italy (60%), 1984.

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Bellastella, A., Criscuolo, T., Sinisi, A.A. et al. Plasma thyrotropin, thyroxine, triiodothyronine, free thyroxine, free triiodothyronine, and Cortisol levels in blind prepubertal boys. J Endocrinol Invest 11, 171–174 (1988). https://doi.org/10.1007/BF03350128

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  • DOI: https://doi.org/10.1007/BF03350128

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