Related Experiment Videos
Thyroid functions in lithium-treated psychiatric patients: a cross-sectional study.
S D Deodhar1, B Singh, C M Pathak
1Department of Nuclear Medicine, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
Biological Trace Element Research
|March 12, 1999
Summary
Lithium treatment for affective disorders significantly increases thyroid radioiodine uptake and TSH levels, leading to subclinical hypothyroidism in 39% of patients. Iodine deficiency exacerbates these thyroid function changes.
Area of Science:
- Endocrinology
- Psychiatry
- Pharmacology
Background:
- Lithium (Li) is a widely used mood stabilizer for affective disorders.
- Thyroid dysfunction is a known side effect of lithium treatment.
- The impact of lithium on thyroid function in patients with affective disorders requires further investigation.
Purpose of the Study:
- To evaluate thyroid functions, including radioiodine uptake (RAIU) and serum hormone levels (T3, T4, TSH), in patients with affective disorders undergoing lithium treatment.
- To assess the prevalence of lithium-induced thyroid dysfunction and its correlation with treatment duration and iodine status.
Main Methods:
- Cross-sectional study comparing 24 healthy controls and 132 patients with affective disorders on lithium therapy.
- Measurements included thyroid radioiodine uptake (RAIU) and serum T3, T4, and TSH levels.
- Patients were categorized based on lithium treatment duration (0.7 to 240 months) and iodine deficiency status.
Main Results:
- Lithium therapy significantly increased RAIU and TSH levels.
- Subclinical hypothyroidism was observed in 39% (51/132) of patients.
- In iodine-deficient patients, high TSH and low T4 levels were noted, with some exhibiting clinical hypothyroidism.
- T4 levels decreased significantly with long-term lithium treatment (61-240 months).
- The T3/T4 ratio was elevated during short-term lithium treatment (0.7-6 months) but normalized with prolonged therapy.
Conclusions:
- Lithium treatment induces significant alterations in thyroid function, including increased RAIU, elevated TSH, and a high prevalence of subclinical hypothyroidism.
- Iodine deficiency may worsen lithium-induced thyroid dysfunction.
- Long-term lithium therapy is associated with decreased T4 levels, highlighting the importance of regular thyroid function monitoring in patients on this medication.