The nurse is caring for a patient with a history of angina and is treated with a calcium channel blocker. Which of the following would suggest a positive therapeutic response to the medication?

A. Decreased swelling in the ankles and feet: While some calcium channel blockers may cause peripheral edema, reduction in swelling is not a primary indicator of therapeutic effect for angina. Edema changes are more related to adverse effects than efficacy. B. Patient denies dizziness.: Avoiding dizziness may indicate tolerability of the medication but does not reflect improvement in angina symptoms or cardiac oxygen supply. C. Absence of chest pain: Relief or prevention of angina attacks is the main therapeutic goal of calcium channel blockers in patients with angina. Reduction in chest pain indicates effective myocardial oxygen delivery and successful management of ischemic episodes. D. Patient states that she feels stronger: Feeling stronger may reflect general well-being but is not a specific measure of angina control. The absence of chest pain is a more direct and clinically relevant indicator of therapeutic response.