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  • 1. Funkquist, Anders
    et al.
    Wandt, Birger
    Blennow, Kaj
    Zetterberg, Henrik
    Svensson, Johan
    Bjellerup, Per
    Freund-Levi, Yvonne
    Sjöberg, Stefan
    Sophiahemmet University.
    Higher CSF/serum free-T4 ratio is associated with improvement of quality of life during treatment with L-thyroxine2023In: Journal of neuroendocrinology, ISSN 0953-8194, E-ISSN 1365-2826, Vol. 35, no 5, p. e13272-, article id e13272Article in journal (Refereed)
    Abstract [en]

    Up to 20% of individuals with primary hypothyroidism treated with L-thyroxine still suffer from severe symptoms. These are supposedly brain derived and involve both cognitive and emotional domains. Previously, no consistent relationship has been found between thyroid hormones (TH) or TSH levels in blood and quality of life (QoL). Recently, we reported an association between cerebrospinal fluid (CSF)/serum free-thyroxine (f-T4) ratio and QoL, in juvenile hypothyroid patients. Here, we investigated if CSF/serum f-T4 ratio and QoL estimates correlate also during L-thyroxine treatment. Moreover, the CSF biomarker neurogranin (Ng) was used as a biomarker for synaptic function and integrity in clinical research. Ng is partially controlled by TH and therefore we investigated the relationship between QoL parameters and Ng levels. Patients diagnosed with primary hypothyroidism were investigated using vital parameters, serum and CSF analyses of TH, TSH, Ng and QoL questionnaires. Similar procedures were performed after 6 months of treatment. The most marked associations with QoL were found for CSF/serum f-T4 ratio, which was strongly related to several QoL parameters such as the mental subscore of SF-36 (r = 0.83, p < .0005). Ng, which did not differ from that in our healthy controls, was lower in some patients during treatment and higher in others. However, the change in Ng during treatment was significantly correlated with QoL parameters including the mental subscore of SF-36 (r = -0.86, p < .0001). In addition, the CSF/serum f-T4 ratio correlated with the change in Ng (r = -0.75, p = .001). Our results suggest that the ratio between CSF and serum f-T4 is an important biomarker for QoL during treatment of patients with primary hypothyroidism, so far in research, but in the future maybe also in clinical settings. Moreover, this ratio also correlates with the changes in Ng levels during L-thyroxine treatment, further supporting the impact of the TH balance between serum and CSF on QoL.

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