Which finding should the nurse assess in a client taking ergotamine for vascular headaches?

The correct finding to assess in a client taking ergotamine for vascular headaches is cool, numb fingers and toes. Ergotamine is a medication that acts on the vascular system by causing vasoconstriction, which can lead to reduced blood flow to the extremities. This vasoconstrictive effect may result in the sensation of coldness and numbness in fingers and toes, indicating that the blood supply is diminished in those areas.

When using ergotamine, it is important for healthcare providers to monitor for potential side effects related to its mechanism of action. The presence of cool, numb extremities can signal overuse or toxicity, which may lead to more serious complications such as peripheral ischemia.

In contrast, other findings, such as increased heart rate, dry mouth, and frequent urination, are less characteristic of the effects of ergotamine. While increased heart rate could occur due to various reasons, it is not a primary concern when monitoring for side effects of this particular medication. Similarly, dryness of the mouth and increased urination are not typical side effects associated with ergotamine use. They may be more relevant to other medications or conditions.