In the management of hyperthyroidism, what precaution is advised regarding epinephrine use?

• A. Do not use epinephrine; check vitals
• B. Use epinephrine liberally
• C. Epinephrine is contraindicated only with hypothyroidism
• D. Epinephrine has no special considerations

Answer: (A)

In hyperthyroidism the body becomes unusually sensitive to catecholamines because of upregulated beta-adrenergic receptors and heightened sympathetic activity. Epinephrine, being a potent catecholamine, can therefore provoke exaggerated cardiovascular responses such as rapid heart rate, increased contractility, hypertension, and even arrhythmias or angina. The safest approach is to avoid using epinephrine when possible and to monitor the patient closely if its use is unavoidable—checking vital signs to catch any adverse effects early. If epinephrine must be used, it should be at the minimal effective dose with careful hemodynamic monitoring. The other options overstate safety or misstate the condition, since the risk is present in hyperthyroidism and no special consideration is not appropriate.