For the studies, probes of the thyroxin and tireotropin hormone levels in the blood have been prevailed. The analyzed patients were diagnosed with subclinical hypothyroidism if the TSH stimulating hormone was low. These subjects proved to have an increased risk and frequency of coronary diseases as the normal population without thyroid issues.

The patients complied with the studies were dynamically supervised in the next years in order to determine the rate of cardiovascular causes of death. The results were astonishing; 21 subjects with subclinical hypothyroidism suffered deaths linked to the cardiovascular system, 80# more than the expected number of death judging by age, sex and medical history. The conclusions are an increased percent of cardiac linked deaths in patients with thyroid problems. The susceptibility to death is one and a half higher.

In cases of coronary arteries diseases, the rate of the attacks was double as the one from persons with no thyroid problems. This particular experimental study was affected in Australia over a period of several years.

In the United States of America another similar study was made on women and men with low levels of TSH in a period of four years. The target of the study was to show the risk of heart failure in patients with subclinical hypothyroidism. The thyroid condition was connected to congestive heart diseases, coronary disease and stroke, peripheral arterial disease.

Congestive heart failure was frequent in the subjects with TSH levels of 7.0 and above; patients with TSH level situated between 7.9 and 9.9 the risk was double and those with TSH= more than 10 the susceptibility was three times higher.

No actual connection was found by the Americans between hypothyroidism and coronary disease, strokes and cardiovascular mortality. The Australians however found the risk of coronary artery disease higher in patients with subclinical hypothyroidism. The first study showed an increased risk of congestive heart failure.

Although the results seem to be contradictory, the two studies have actually discovered a link between the discussed conditions. Cardiovascular diseases are more frequent in persons suffering from hypothyroidism, especially the ones with a TSH level above 10mUI. The doctors should take the link into consideration and monitor all potential risk factors.