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From the review:
Hypothyroidism can result in decreased cardiac output, increased systemic vascular resistance, decreased arterial compliance, and atherosclerosis.
Impaired cardiac muscle relaxation, decreased heart rate, and decreased stroke volume contribute to heart failure in hypothyroidism.
Subclinical hypothyroidism is associated with ischemic heart disease and increased cardiovascular mortality.
Treatment of hypothyroidism may have a beneficial impact on several parameters of cardiac dysfunction, including subclinical hypothyroidism, especially in younger individuals.