A client with angina pectoris receives a prescription for nitroglycerin. Which statement shows that the patient understands how to use this medication?

A. Coronary arteriosclerosis: The narrowing and hardening of the coronary arteries restrict the flow of oxygenated blood to the myocardium. When physical activity increases the heart's oxygen demand, the restricted vessels cannot provide adequate supply, resulting in ischemic pain known as angina. This is the primary underlying cause of most cases of chronic stable angina.

B. Decreased workload of the heart: A reduction in cardiac workload would actually decrease the likelihood of experiencing angina. Angina is triggered when the workload exceeds the available oxygen supply, such as during physical exertion or stress. Management of angina focuses on reducing this workload through rest and medications like beta-blockers.

C. Atrial septal defect: This congenital heart defect involves an opening in the wall between the atria, which primarily causes shunting of blood. While it can lead to long-term complications like pulmonary hypertension, it is not the most common cause of typical angina pectoris in adults. Angina is almost always a result of obstructive coronary artery disease.

D. Infarction of the myocardium: Myocardial infarction refers to actual tissue death due to a complete and prolonged lack of blood flow. Angina is a warning sign of ischemia without cell death, which is why the client's cardiac labs and EKG remained normal. Infarction represents a permanent injury, whereas angina is a transient episode of oxygen mismatch.

A. "I can go back to the gym and do light weight baring exercise and yoga.": Patients must avoid vigorous upper body activity and lifting heavy weights for several weeks to prevent lead dislodgement. Yoga often involves stretching the arms above the shoulder, which can pull on the newly implanted pacemaker leads. This statement reflects a misunderstanding of the immediate postoperative activity restrictions required for device stability.

B. "I will report any new dizziness or lightheadedness to my health care provider.": These symptoms may indicate pacemaker malfunction, such as failure to pace or loss of capture. Dizziness suggests that the heart rate is not being maintained at a level sufficient for adequate cerebral perfusion. Reporting these signs is a critical component of post-implantation safety and monitoring.

C. "I will take my pulse every day and left my health care provider if my heart rate is less than 60 beats per minute.": Monitoring the daily pulse ensures the pacemaker is maintaining the programmed minimum heart rate. A rate lower than the set threshold indicates a potential battery or electrode problem that requires urgent evaluation. This demonstrates the patient's understanding of how to monitor their own cardiac stability.

D. "I will avoid raising my arm over my head until cleared by my health care provider.": Restricting the range of motion on the affected side prevents the accidental pulling or displacement of the cardiac leads before they have scarred into place. This is a standard instruction during the first few weeks following a permanent pacemaker procedure. It is essential for ensuring long-term device functionality and successful healing.