Which cardiac manifestation is commonly seen in hyperthyroidism?

Which cardiac manifestation is commonly seen in hyperthyroidism?

• A. Bradycardia
• B. Tachycardia
• C. Hypertension
• D. Arrhythmia

Answer: (B)

Hyperthyroidism speeds up the body's metabolism, and thyroid hormones increase the heart’s responsiveness to sympathetic signals by upregulating beta-adrenergic receptors. This raises the heart rate and cardiac output, so tachycardia is the most common cardiac finding. Patients often notice palpitations and a fast, strong pulse. While hypertension and some rhythm disturbances can occur, the hallmark cardiac change is tachycardia due to the heightened chronotropic effect of excess thyroid hormone.

Hyperthyroidism speeds up the body's metabolism, and thyroid hormones increase the heart’s responsiveness to sympathetic signals by upregulating beta-adrenergic receptors. This raises the heart rate and cardiac output, so tachycardia is the most common cardiac finding. Patients often notice palpitations and a fast, strong pulse. While hypertension and some rhythm disturbances can occur, the hallmark cardiac change is tachycardia due to the heightened chronotropic effect of excess thyroid hormone.