Thyroid gland problems also enhance the heart problem:
Thyroid hormone (hyperthyroidism or hypothyroidism) can certainly affect heart-beat, blood pressure, and cholesterol level.
Thyroid disorders (malfunctioning of the thyroid gland) can cause heart problems, creates heart disease or can worsen existing heart disease
So it is most important for proper diagnosis the thyroid function and if found abnormal thyroid function, must get treatment for this abnormality
The abnormal thyroid function is a caution for heart patients.