A nurse is teaching a client who is newly diagnosed with type 1 diabetes mellitus about insulin safety. Which of the following statements by the nurse is appropriate?

Choice A Reason:

Coronary arteries do not become more elastic with age. Instead, they tend to become less elastic due to the buildup of plaque, a condition known as atherosclerosis. This buildup narrows the arteries and restricts blood flow, which can lead to coronary artery disease (CAD). The heart not receiving enough oxygen is a result of this narrowing, not increased elasticity.

Choice B Reason:

Coronary arteries decrease in diameter due to the buildup of plaque, which consists of fats, cholesterol, and other substances. This narrowing restricts the flow of blood, oxygen, and nutrients to the heart muscle, leading to symptoms such as chest pain (angina) and shortness of breath. This is the primary mechanism behind coronary artery disease.

Choice C Reason:

This choice is essentially a repetition of Choice B and is correct for the same reasons. The narrowing of the coronary arteries due to plaque buildup leads to insufficient blood flow, causing the heart muscle to receive less oxygen and nutrients.

Choice D Reason:

Manifestations of coronary artery disease are not due to the dilation of coronary arteries. Instead, they are due to the narrowing of these arteries. Increased blood flow and pressure are not typical causes of CAD symptoms. The primary issue is the restricted blood flow due to narrowed arteries.

Choice E Reason:

While it is true that the heart and coronary arteries can weaken over time, leading to poor perfusion and angina, this statement does not accurately describe the primary mechanism of coronary artery disease. The main issue in CAD is the narrowing of the arteries due to plaque buildup, which restricts blood flow to the heart muscle.

Choice A reason: Metabolic alkalosis is a condition characterized by an elevated pH in body tissues, typically due to an excess of bicarbonate or a loss of hydrogen ions. This condition is not associated with Kussmaul breathing. Kussmaul breathing is a deep and labored breathing pattern often seen in patients with metabolic acidosis, not alkalosis. In metabolic alkalosis, the body does not need to expel excess acid through rapid breathing, so Kussmaul respirations are not observed.

Choice B reason: Metabolic acidosis is a condition where there is an excess of acid in the body due to the accumulation of acid or the loss of bicarbonate. This condition is commonly seen in diabetic ketoacidosis (DKA), where the body produces high levels of ketones, leading to acidosis. Kussmaul breathing is a compensatory mechanism in metabolic acidosis, where the body attempts to reduce the acid level by expelling carbon dioxide through rapid, deep breaths. This type of breathing helps to lower the blood’s acidity by reducing the concentration of carbon dioxide, which is an acid.

Choice C reason: Respiratory alkalosis is a condition where there is a decrease in carbon dioxide levels in the blood due to excessive breathing or hyperventilation. This condition leads to an increase in blood pH, making it more alkaline. Kussmaul breathing is not associated with respiratory alkalosis because it is a response to metabolic acidosis, not a condition where the body is already expelling too much carbon dioxide.

Choice D reason: Respiratory acidosis is a condition where there is an excess of carbon dioxide in the blood due to inadequate respiration. This leads to a decrease in blood pH, making it more acidic. While respiratory acidosis involves an acidic environment, Kussmaul breathing is specifically a response to metabolic acidosis, not respiratory acidosis. In respiratory acidosis, the body would not use Kussmaul respirations as a compensatory mechanism.