What indicates the effectiveness of propylthiouracil treatment in a client with Graves' disease?

The effectiveness of propylthiouracil treatment in a client with Graves' disease is indicated by an increase in the ability to focus. Propylthiouracil is an antithyroid medication that reduces the production of thyroid hormones, which can be elevated in Graves' disease, leading to symptoms such as anxiety, restlessness, and difficulty concentrating. When the treatment effectively lowers the levels of thyroid hormones, patients typically experience a decrease in hyperthyroid symptoms, which can include improved cognitive function and focus.

This improvement in the ability to concentrate reflects a stabilization of metabolic functions and a reduction in symptoms related to cognitive disturbances caused by excessive thyroid hormone levels. Other options might relate to various aspects of health, but they do not directly correlate to the effectiveness of managing the neurological symptoms associated with hyperthyroidism. For example, a decrease in WBC count would not be a desired indicator of medication effectiveness, and changes in sleep or appetite may not consistently reflect the direct impact of propylthiouracil treatment.