Which of the following findings is typically associated with hyperthyroidism?

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Multiple Choice

Which of the following findings is typically associated with hyperthyroidism?

Explanation:
Hyperthyroidism raises the body's metabolic rate and enhances sympathetic effects on the heart. Excess thyroid hormones (T3 and T4) increase the activity of the sinoatrial node and strengthen myocardial contractility, and they upregulate beta-adrenergic receptors, making the heart more responsive to adrenaline. This combination leads to an increased heart rate and cardiac output, so tachycardia is a typical finding. The other options reflect a slowed metabolism, which is more characteristic of hypothyroidism—lethargy, weight gain, and constipation—rather than the accelerated state seen with hyperthyroidism.

Hyperthyroidism raises the body's metabolic rate and enhances sympathetic effects on the heart. Excess thyroid hormones (T3 and T4) increase the activity of the sinoatrial node and strengthen myocardial contractility, and they upregulate beta-adrenergic receptors, making the heart more responsive to adrenaline. This combination leads to an increased heart rate and cardiac output, so tachycardia is a typical finding.

The other options reflect a slowed metabolism, which is more characteristic of hypothyroidism—lethargy, weight gain, and constipation—rather than the accelerated state seen with hyperthyroidism.

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