Which finding would indicate that nadolol is effective for a client with stable angina?

The indication that nadolol is effective for a client with stable angina is demonstrated by the relief of chest pain. Nadolol is a non-selective beta-blocker that works by slowing the heart rate, decreasing the force of contraction, and reducing blood pressure. These actions help to decrease myocardial oxygen demand, which is crucial for patients experiencing angina. When angina is effectively managed, the client typically reports a decrease or complete relief of chest pain.

The other findings listed do not correlate with the therapeutic effects expected from nadolol in managing stable angina. An increased pulse rate and increased blood pressure would suggest that the heart is under greater stress, which is contrary to the goal of using a beta-blocker. Increased anxiety can also indicate increased stress on the heart, which again is not a sign of effective angina management. Thus, the relief of chest pain is the most telling indicator of the medication's effectiveness in this context.