Early pospartum alexithymia and risk for depression: Relationship with serum thyrotropin, free thyroid hormones and thyroid autoantibodies

摘要

Most psychometric evaluations in the postpartum (PP) target depression (PPD) and show an association with thyroid autoantibodies (TAb), not with thyroid function. Three studies evaluated PP alexithymia, but none its relationship with thyroid indices. We tested 74 women aged 31.8 ± 4.64 years, on day 3 PP, by the Edinburgh Postnatal Depression Scale (EPDS), the Montgomery and Asberg Depression Rating Scale (MADRS), and the Toronto Alexithymia Scale (TAS). Concurrently, we measured serum thyrotropin (TSH), free T3 (FT3), free T4 (FT4), thyroperoxidase and thyroglobulin antibodies (TPOAb, TgAb). Using cut-off scores of ≥12 (EPDS), ≥15 (MADRS) and ≥61 (TAS), rates of women with abnormal EPDS and MADRS scores were similar (31%, 30% and 28.4%, respectively). TAS scores were higher and proportions of alexithymics were greater in the abnormal EPDS group or in the abnormal MADRS group than in the normal EPDS or MADRS group. EPDS correlated significantly with TAS. Compared to nonalexithymics, alexythimics had lower FT4, higher FT3, lower FT4:FT3 ratio, and insignificantly higher TPOAb or TgAb levels. Only TPOAb and TgAb were significantly higher in women at risk for PPD compared to women not at risk for PPD, but solely at EPDS cut-off values of ≥13 or ≥14. TAS correlated directly with TPOAb and FT3, and inversely with FT4:FT3 ratio, while EPDS correlated only with TPOAb. Comparing women at risk for depression but nonalexithymics or women alexithymics but not at risk for depression vs. women normal on all scales, the former had lower FT3 and higher FT4:FT3 ratio while the latter had lower both FT4 and FT4:FT3 ratio. We conclude that PPD risk and alexithymia (i) are partly comorbid and directly associated with thyroid autoimmunity; (ii) their association with serum free thyroid hormones and with FT4:FT3 ratio goes in opposite directions.