A nurse is reviewing the medical history of a client who has a new prescription for sumatriptan to treat migraine headaches. Which of the following conditions should the nurse identify as a contraindication for taking this medication?

Nursing care for a client prescribed Sumatriptan involves assessing for cardiovascular risk factors and contraindications before administration. Sumatriptan is used for acute treatment of migraine headaches and works by causing cranial vasoconstriction through serotonin receptor agonism. Because of its vasoconstrictive effects, it can reduce blood flow in coronary and peripheral vessels. Therefore, it is contraindicated in clients with significant cardiovascular disease or ischemic conditions. Rationale: A. Hypotension is not a contraindication for sumatriptan use. Although sumatriptan can affect vascular tone, its primary concern is vasoconstriction rather than lowering blood pressure. Clients with low blood pressure may still receive the medication if no other contraindications exist, though monitoring is still important. B. Myocardial infarction is a contraindication because sumatriptan causes vasoconstriction of coronary arteries, which can worsen myocardial ischemia. In clients with a history of MI or coronary artery disease, this effect significantly increases the risk of recurrent ischemia or cardiac events. Therefore, sumatriptan should be avoided in patients with known cardiovascular disease. C. Cholelithiasis is not a contraindication for sumatriptan therapy because gallstones do not affect vascular or neurologic pathways involved in migraine treatment. This condition is unrelated to the drug’s mechanism of action or safety profile. The medication can be safely used in clients with gallbladder disease if no other contraindications are present. D. Hypothyroidism is not a contraindication for sumatriptan use. Although thyroid disorders may contribute to general fatigue or metabolic changes, they do not interact with serotonin-mediated vasoconstriction. Clients with hypothyroidism can safely use sumatriptan as prescribed, provided cardiovascular risk factors are absent.