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[Subclinical thyroid disease: subclinical hypothyroidism and hyperthyroidism]
João Hamilton Romaldini1, José Augusto Sgarbi, Chady Satt Farah
1Faculdade de Medicina, Centro de Ciências da Vida, PUC, Campinas, SP. jhroma@netpoint.com.br
Arquivos Brasileiros De Endocrinologia E Metabologia
|December 22, 2004
Summary
Subclinical hypothyroidism and hyperthyroidism involve normal thyroid hormone levels but abnormal TSH. Treatment is recommended for TSH levels above 8 mU/L in SHT or below 0.1 mU/L in SCH, especially with symptoms or in the elderly.
Area of Science:
- Endocrinology
- Thyroidology
- Internal Medicine
Context:
- Subclinical hypothyroidism (SHT) and subclinical hyperthyroidism (SCH) are common thyroid conditions.
- Characterized by normal serum free T4 and T3 with abnormal TSH levels.
- Often present with subtle or absent symptoms, making diagnosis challenging.
Purpose:
- To review the clinical manifestations, diagnostic criteria, and treatment guidelines for SHT and SCH.
- To highlight the cardiovascular, metabolic, and psychological impacts of these conditions.
- To provide evidence-based recommendations for therapeutic intervention.
Summary:
- SHT is associated with elevated cholesterol and potential cardiac changes, while SCH is linked to atrial fibrillation and cardiac dysfunction.
- Cognitive and mood alterations are frequent in SHT.
- Treatment is advised for SHT with TSH > 8 mU/L and antibodies, and for SCH with TSH < 0.1 mU/L, particularly in symptomatic or elderly patients.
Impact:
- Early diagnosis and treatment of SHT and SCH can mitigate cardiovascular risks and improve patient outcomes.
- Understanding the subtle manifestations aids in timely intervention.
- Management strategies can reverse or improve cardiac and metabolic abnormalities.