Final answer:
After giving sumatriptan, the nurse should watch for signs of chest pain, which could signify myocardial ischemia, a possible side effect of the medication.
Step-by-step explanation:
Following the administration of sumatriptan, the nurse should monitor for chest pain due to the risk of myocardial ischemia. Sumatriptan is a medication used to treat migraine headaches by narrowing blood vessels around the brain. However, it can also affect blood vessels in other parts of the body, potentially leading to reduced blood flow to the heart and myocardial ischemia.
Therefore, it is important for healthcare providers to watch for signs of chest pain after administering the drug, as this can indicate a serious cardiovascular event.