An older patient with hypothyroidism asks why her daily dose of thyroid hormone has been reduced. The nurse's best explanation is related to:

An older patient with hypothyroidism asks why her daily dose of thyroid hormone has been reduced. The nurse's best explanation is related to:

• A. Improved efficacy of the thyroid preparation
• B. Age-related reduction in metabolic rate
• C. Drug-related hypertrophy of the thyroid
• D. Changes in your diet and activity level

Answer: (B)

In older adults, resting metabolic rate tends to decrease with age, and the body's overall need for thyroid hormone often drops. Giving the same dose as a younger patient can push metabolism too far, leading to symptoms of hyperthyroidism and potential cardiac risks. So the dose is reduced to match the age-related decline in metabolic demand and to avoid overstimulation from the replacement therapy. The other ideas don’t fit as well: improved efficacy would imply needing more medication, not less; thyroid enlargement isn’t a consequence of taking thyroid hormone replacement in this context; and changes in diet or activity level don’t explain a routine dose reduction as clearly as the aging-related decrease in metabolic rate.

In older adults, resting metabolic rate tends to decrease with age, and the body's overall need for thyroid hormone often drops. Giving the same dose as a younger patient can push metabolism too far, leading to symptoms of hyperthyroidism and potential cardiac risks. So the dose is reduced to match the age-related decline in metabolic demand and to avoid overstimulation from the replacement therapy. The other ideas don’t fit as well: improved efficacy would imply needing more medication, not less; thyroid enlargement isn’t a consequence of taking thyroid hormone replacement in this context; and changes in diet or activity level don’t explain a routine dose reduction as clearly as the aging-related decrease in metabolic rate.