1
Subjects with increased serum TSH levels or overt hyperthyroidism were excluded.
2
If the cardiovascular effects of overt hyperthyroidism are well documented, the relation between subclinical dysthyroidism and the heart is not well established.
3
Subclinical hyperthyroidism may be caused by the same thyroid disorders that results in overt hyperthyroidism, but the most common cause is excessive dosage in levothyroxine.
4
A study population of 4087 subjects (2050 women) without overt hyperthyroidism or increased serum thyrotropin levels was available for the present study.