A male client with angina pectoris is being discharged from the hospital. Which instruction should the nurse plan to include in his discharge teaching?

A. Keep nitroglycerin in a light-colored plastic bottle and readily available: Nitroglycerin should be stored in its original dark glass container to protect it from light, heat, and moisture, all of which can reduce its potency. B. Avoid isometric exercises, but walk regularly: Isometric exercises can sharply increase blood pressure and cardiac workload, potentially triggering angina. In contrast, regular walking improves cardiovascular health without the abrupt rise in myocardial oxygen demand. C. Walk briskly in cold weather to increase cardiac output: Cold weather causes vasoconstriction, which increases cardiac workload and can provoke angina. Brisk walking in such conditions is risky for clients with coronary artery disease and should be avoided. D. Engage in physical exercise immediately after eating to help decrease cholesterol levels: Exercising immediately after a meal diverts blood away from digestion, which can strain the heart and trigger angina. Exercise should be scheduled at least 1–2 hours after meals to avoid postprandial angina.