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Last Updated on October 6, 2022 by Shabnam Sengupta
There are certain cardiac effects of hyperthyroidism including faster heart rate, increased blood pressure and irregular electrical activity of the heart. The patient may experience tachycardia and palpitations. Increased thyroid hormone can lead to a faster heart rate and stronger squeezing of the heart. One may even experience heart beating faster and stronger, even at rest. These symptoms may even be exaggerated by any form of physical stress such as exercise. Therefore, the patient develops decreased exercise tolerance.
Hyperthyroidism causes high cardiac output and left ventricular hypertrophy in the early stage and biventricular dilatation and congestive heart failure in the late stage. Atrial fibrillation and pulmonary hypertension also add to the increased morbidity of untreated hyperthyroidism. Early and effective treatment of hyperthyroidism is key to preventing thyrotoxic cardiomyopathy. It is a disease of the heart muscle that makes it harder for the heart to pump blood to the rest of the body that can eventually lead to heart failure.
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