A nurse is assessing a client who has Lewy body dementia. The nurse should recognize that which of the following is responsible for changes in thinking, communication, movement, and emotional processing in Lewy body dementia?

Tau protein

Neurofibrillary tangles

Alpha-synuclein protein

Beta-amyloid protein

Answer and Explanation

The Correct Answer is C

A. Tau protein: Tau protein is primarily associated with Alzheimer's disease and other tauopathies, not Lewy body dementia.

B. Neurofibrillary tangles: Neurofibrillary tangles are aggregates of hyperphosphorylated tau protein found in Alzheimer's disease, not typically in Lewy body dementia.

C. Alpha-synuclein protein: Lewy bodies, which are abnormal aggregates of alpha-synuclein protein, are a hallmark pathology of Lewy body dementia. These protein aggregates disrupt neuronal function and are responsible for the cognitive, motor, and emotional symptoms seen in Lewy body dementia.

D. Beta-amyloid protein: Beta-amyloid protein is primarily associated with Alzheimer's disease, not Lewy body dementia. It forms plaques in the brain, which contribute to neurodegeneration and cognitive decline in Alzheimer's disease.

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Correct Answer is D

Explanation

A. "The heart and the coronary arteries weaken, leading to poor perfusion and resulting in angina": This statement is inaccurate. While angina can result from poor perfusion to the heart muscle, it is not typically due to weakening of the heart and coronary arteries. Angina often occurs due to coronary artery narrowing or blockage, leading to reduced blood flow and oxygen delivery to the myocardium.

B. "Coronary arteries become more elastic causing the arteries to stretch as individuals age causing the heart not to receive enough oxygen": This statement is incorrect. Coronary arteries do not become more elastic with age; in fact, they tend to become less elastic due to the development of atherosclerosis, which leads to arterial stiffening and decreased compliance. Atherosclerosis can cause narrowing or occlusion of the coronary arteries, resulting in reduced oxygen delivery to the heart muscle.

C. "Coronary arteries decrease in diameter leading to insufficient blood, oxygen, and nutrients reaching the heart muscle. Manifestations occur due to dilation of coronary arteries with increased blood flow causing increased pressure": This statement is partially incorrect. While it accurately describes the consequences of coronary artery narrowing (decrease in diameter) leading to insufficient blood, oxygen, and nutrient delivery to the heart muscle, the second part of the statement regarding dilation of coronary arteries with increased blood flow causing increased pressure is inaccurate. Coronary artery dilation is a compensatory response to increased demand for oxygen, aiming to improve blood flow to the myocardium. However, dilation alone does not increase pressure in the coronary arteries.

D. "Coronary arteries decrease in diameter leading to insufficient blood, oxygen, and nutrients reaching the heart muscle": This statement is accurate. Coronary artery disease (CAD) involves the progressive narrowing of the coronary arteries due to atherosclerosis, which reduces blood flow to the myocardium. As the arteries narrow, there is insufficient blood, oxygen, and nutrients reaching the heart muscle, leading to manifestations such as angina, myocardial ischemia, and potentially myocardial infarction.

A. Third spacing B. Cardiomyopathy C. Cardiac tamponade D. Ruptured aneurysm

Correct Answer is C

Explanation

A. Third spacing: Third spacing refers to the shifting of fluid from the intravascular space into the interstitial space, leading to decreased circulating volume. While third spacing can contribute to hypovolemic shock, it is not specific to obstructive shock.

B. Cardiomyopathy: Cardiomyopathy is a condition characterized by abnormalities in the heart muscle structure and function. While cardiomyopathy can lead to heart failure, it is not directly associated with obstructive shock.

C. Cardiac tamponade: Cardiac tamponade occurs when fluid accumulates in the pericardial sac, compressing the heart and impairing its ability to fill properly. This condition can lead to obstructive shock due to decreased cardiac output. Signs and symptoms include hypotension, muffled heart sounds, distended neck veins, and pulsus paradoxus.

D. Ruptured aneurysm: A ruptured aneurysm can lead to hypovolemic shock due to acute blood loss. While it can cause significant hemodynamic instability, it is not a characteristic diagnosis of obstructive shock.

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A nurse is assessing a client who has Lewy body dementia. The nurse should recognize that which of the following is responsible for changes in thinking, communication, movement, and emotional processing in Lewy body dementia?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

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Correct Answer is D

Explanation

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Correct Answer is C

Explanation

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