A nurse is providing teaching to a client who has coronary artery disease. Which of the following statements should the nurse include to explain the correlation between changes in the coronary arteries and manifestations that occur?

Choice A rationale Dilation of coronary arteries actually facilitates increased blood flow and is a physiological response during exercise to meet metabolic demands. In coronary artery disease, the vessels are typically unable to dilate effectively due to atherosclerosis and endothelial dysfunction. Increased pressure within the vessel does not cause the typical manifestations of angina; rather, it is the obstruction and lack of flow through a narrowed lumen that leads to the clinical symptoms experienced by the client. Choice B rationale Coronary artery disease involves the buildup of plaque within the intimal layer of the vessel wall, a process known as atherosclerosis. This plaque accumulation progressively decreases the diameter of the artery, creating a physical obstruction. Consequently, during periods of increased myocardial oxygen demand, the restricted blood flow cannot deliver sufficient oxygen and nutrients to the myocardium. This imbalance between supply and demand results in myocardial ischemia, which is the underlying cause of anginal pain and potential infarction. Choice C rationale While chronic ischemia can eventually lead to weakening of the heart muscle, known as ischemic cardiomyopathy, the term weakening does not accurately describe the primary correlation in coronary artery disease. Perfusion is poor because of the physical narrowing and reduced elasticity of the coronary vessels, not because the vessels themselves are weak. Angina is specifically a symptom of oxygen deprivation caused by the arterial blockage rather than a generalized weakening of the cardiovascular structural components. Choice D rationale As individuals age, coronary arteries generally become less elastic and more rigid due to calcification and collagen deposition, a process termed arteriosclerosis. Increased elasticity would actually allow the vessels to better accommodate blood flow. The lack of oxygen reaching the heart in coronary artery disease is caused by the stiffening and narrowing of the lumen, which prevents the vessels from stretching or dilating to accommodate the blood flow necessary to meet the metabolic needs of the heart.