A nurse is teaching the partner of a client who had an acute myocardial infarction (MI) about the reason blood was drawn from the client. Which of the following statements should the nurse make regarding cardiac enzyme studies?
"These tests help determine the degree of damage to the heart tissues."
"These tests will enable the provider to determine the heart structure and mobility of the heart valves."
"Cardiac enzymes will identify the location of the MI."
"Cardiac enzymes assist in diagnosing the presence of pulmonary congestion."
The Correct Answer is A
The nurse should explain that cardiac enzyme studies measure the levels of certain enzymes, such as troponin, creatine kinase, and lactate dehydrogenase, that are released into the bloodstream when the heart muscle is damaged by an MI. These tests help determine the degree of damage to the heart tissues, as well as the timing and severity of the MI.
"These tests will enable the provider to determine the heart structure and mobility of the heart valves." is wrong because cardiac enzyme studies do not provide information about the heart structure and mobility of the heart valves. Other tests, such as echocardiography or cardiac catheterization, may be used for this purpose.
"Cardiac enzymes will identify the location of the MI." is wrong because cardiac enzyme studies do not indicate the specific location of the MI within the heart. Other tests, such as electrocardiography or coronary angiography, may be used for this purpose.
"Cardiac enzymes assist in diagnosing the presence of pulmonary congestion." is wrong because cardiac enzyme studies do not directly assess the presence of pulmonary congestion, which is a complication of heart failure. Other signs and symptoms, such as dyspnea, crackles, and chest x-ray findings, may be used for this purpose.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
The correct answer is B
Choice B reason: Intermittent claudication
Intermittent claudication is a characteristic symptom of PAD in the early stage, due to the reduced blood flow to the muscles during exercise. It is a cramping pain in the legs that occurs with walking and is relieved by rest.
Choice A reason: Dependent rubor is a sign of PAD in the advanced stage, due to the impaired vasodilation and reactive hyperemia. It is a reddish color of the lower extremities that occurs when they are lowered and disappears when they are elevated.
Choice C reason: Foot ulcers are a complication of PAD in the late stage, due to the poor wound healing and tissue necrosis. They are usually located on the toes, heels, or pressure points.
Choice D reason: Rest pain is another sign of PAD in the late stage, due to the severe ischemia and nerve damage. It is a persistent pain in the feet or toes that occurs at night and is not relieved by rest.
Correct Answer is C
Explanation
Ventricular gallop is another name for the S3 sound, which is a low-pitched sound heard at the end of diastole, just after the S2 sound. It is caused by the rapid filling of the ventricles and the vibration of the ventricular walls.
Closure of the pulmonic valve is one of the components of the S2 sound, which is a high-pitched sound heard at the end of the systole, just before the S1 sound. It is caused by the closure of the semilunar valves (pulmonic and aortic).
Closure of the mitral valve is one of the components of the S1 sound, which is a high-pitched sound heard at the beginning of systole, just after the S2 sound. It is caused by the closure of the atrioventricular valves (mitral and tricuspid).
d. Atrial gallop is another name for the S4 sound, which is a low-pitched sound heard at the end of diastole, just before the S1 sound. It is caused by atrial contraction and increased resistance to ventricular filling.
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