Elevations of thyroid-stimulating hormone during acute nonthyroidal illness

Area of Science:

• Endocrinology
• Geriatric Medicine
• Internal Medicine

Background:

• Thyroid disorders are common, particularly in the elderly.
• Screening for unrecognized thyroid disorders in hospitalized elderly patients is often considered.
• The interpretation of thyroid function tests during acute nonthyroidal illness requires careful consideration.

Purpose of the Study:

• To evaluate the incidence of unrecognized thyroid disorders in elderly hospitalized women.
• To determine if routine screening for thyroid dysfunction is warranted in this population.
• To assess the reliability of thyroid function tests in acutely ill elderly patients.

Main Methods:

• Prospective study of 95 elderly hospitalized women.
• Clinical examinations and comprehensive thyroid function tests, including serum TSH, T4, free T4 index, and triiodothyronine.
• Comparison with a normal control group.

Main Results:

• 13.7% of patients had elevated serum TSH levels with lower T4 and free T4 indexes.
• Transient elevations in TSH were observed in 4.2% of patients.
• Overt hypothyroidism was diagnosed in only 2.1% of patients.

Conclusions:

• Elevated TSH levels in acutely ill elderly patients may be transient or due to nonthyroidal illness, not necessarily indicating hypothyroidism.
• Routine screening for thyroid disorders in elderly hospitalized patients with acute illnesses is not supported by these findings.
• Thyroid function tests in this population should be interpreted with caution, considering the clinical context of acute nonthyroidal illness.