CENTER ON BEHAVIORAL MEDICINE
Disease: Research Article
Thomas, A.F., Kvist, T.K., et al. (2005). Increased risk of
affective disorder following hospitalisation with hyperthyroidism – a
study. European Journal of Endocrinology, Vol 152, Issue
Objective: The pattern of comorbidity between thyroid disorders and affective disorder is not fully known. We assessed whether hospitalisation with hyperthyroidism was a risk factor for hospitalisation with affective disorder and evaluated the temporal relationship between these events.
Design: A historical prospective cohort study comparing patients with hyperthyroidism with patients with non-toxic goitre or osteoarthritis, using existing data from Danish registers. The observational period was from 1 January 1977 to 31 December 1999.
Methods: Three study cohorts were identified by their International Classification of Diseases (ICD) diagnoses at discharge from hospital and consisted of all patients with a first hospital admission with the index diagnoses of hyperthyroidism, osteoarthritis, or non-toxic goitre. Later admissions to psychiatric hospital wards with discharge ICD diagnoses of affective disorder were used as events of interest. Rates of re-admission were estimated using competing risks models in survival analyses. Age, sex, substance abuse, and calendar time were included as co-variables.
Results: A study sample of 183 647 patients discharged with an index diagnosis was identified. In total 1374 events occurred in the observational period. An index diagnosis of hyperthyroidism was associated with an increased risk of hospitalisation with affective disorder for both sexes and for all age-bands investigated, compared with the other index diagnoses. The risk was greatest in the first six months after index hospitalisation (rate ratio, 95% confidence interval: 3.60 (2.58–5.04)).
Conclusions: Patients hospitalised with hyperthyroidism are at greater risk of re-admission with depressive disorder or bipolar disorder than control patients. This suggests that hyperthyroidism is associated with long-term mood disturbances.
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