Changes in brachial-ankle pulse wave velocity in subclinical hypothyroidism during normalization of thyroid function

Area of Science:

• Endocrinology
• Cardiovascular Medicine
• Internal Medicine

Background:

• Subclinical hypothyroidism affects 5-15% of the population.
• It is controversially linked to increased cardiovascular morbidity.
• Arterial stiffening, measured by brachial-ankle pulse wave velocity (baPWV), is a predictor of cardiovascular events.

Purpose of the Study:

• To assess changes in brachial-ankle pulse wave velocity (baPWV) in subclinical hypothyroidism during thyroid function normalization.
• To evaluate the impact of levothyroxine (L-T(4)) replacement therapy on arterial stiffness.

Main Methods:

• Forty-two subclinical hypothyroid patients (8 males, 34 females) were monitored.
• baPWV was measured before and after levothyroxine (L-T(4)) replacement therapy.
• Patients were assessed for changes in baPWV and pulse pressure.

Main Results:

• 59.5% of patients showed reduced baPWV after achieving euthyroidism.
• Patients with reduced baPWV had significantly higher baseline baPWV and pulse pressure.
• Reduced baPWV was more prevalent in females; blood pressure and pulse rate decreased significantly only in this group.

Conclusions:

• Levothyroxine (L-T(4)) replacement therapy may be particularly beneficial for female subclinical hypothyroid patients with high baseline baPWV and pulse pressure.
• The benefits of L-T(4) therapy in reducing arterial stiffness and preventing cardiovascular disease may be limited to this specific sub-population.
• Further investigation is warranted to confirm these findings and their clinical implications.