A nurse is describing the process by which blood is ejected into circulation as the chambers of the heart become smaller.
How does the nurse categorize this action of the heart?
Repolarization
Systole
Diastole
Ejection fraction
The Correct Answer is B
Choice A Rationale:
Repolarization is a phase in the cardiac cycle that involves the restoration of electrical charges in heart muscle cells, enabling them to prepare for the next contraction. It does not directly refer to the physical contraction and ejection of blood from the chambers.
During repolarization, the heart muscle cells regain their negative electrical charge after depolarization, which triggered the contraction.
Repolarization is essential for maintaining the heart's rhythmic electrical activity and ensuring coordinated contractions.
It does not, however, cause the chambers to become smaller and eject blood, which is the defining feature of systole.
Choice C Rationale:
Diastole is the phase of the cardiac cycle when the heart chambers relax and fill with blood. It is the opposite of systole.
During diastole, the heart muscle relaxes, allowing the chambers to passively expand and collect blood from the veins.
The atrioventricular valves (mitral and tricuspid valves) open during diastole, allowing blood to flow from the atria into the ventricles.
While diastole is crucial for ensuring adequate blood supply to the heart, it does not involve the forceful ejection of blood into circulation that characterizes systole.
Choice D Rationale:
Ejection fraction is a measurement of the heart's pumping efficiency. It represents the percentage of blood that is ejected from the left ventricle with each contraction.
A normal ejection fraction is typically between 55% and 70%.
While ejection fraction is related to systole, it is not a synonym for it. Ejection fraction is a quantitative measure of how well the heart is pumping, while systole refers to the specific phase of the cardiac cycle when contraction and ejection occur.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","D"]
Explanation
Choice A rationale:
Pain relief is a primary benefit of morphine administration in the setting of myocardial infarction.
Pain can trigger a stress response, leading to increased heart rate, blood pressure, and myocardial oxygen demand.
Morphine effectively reduces pain, thereby lessening the stress response and its detrimental effects on the heart.
This helps to minimize myocardial ischemia and potential further damage to the heart muscle.
Pain control also improves patient comfort and overall well-being, which can indirectly contribute to better cardiac outcomes.
Choice B rationale:
Sedation is another important benefit of morphine in this context.
It promotes rest and relaxation, which can lower heart rate, blood pressure, and myocardial oxygen demand.
This is crucial for patients with myocardial infarction, as their hearts require reduced workload to heal and recover.
Sedation also helps to alleviate anxiety and agitation, which can further strain the heart.
By inducing a state of calmness, morphine can indirectly protect the heart from additional stress.
Choice C rationale:
While morphine does have diuretic effects, increasing urinary output is not a primary goal in the management of myocardial infarction.
In fact, excessive diuresis could potentially lead to dehydration and hypotension, which could be detrimental to cardiac function.
Therefore, while morphine may slightly increase urine output, this is not a major reason for its use in this setting.
Choice D rationale:
Decreasing myocardial demand is a key benefit of morphine administration in patients with myocardial infarction.
Morphine achieves this by:
Reducing pain and the associated stress response
Promoting sedation and relaxation
Diminishing anxiety and agitation
Exerting a direct vasodilatory effect on blood vessels
This collective action of morphine leads to a decrease in heart rate, blood pressure, and the heart’s overall workload.
As a result, the heart requires less oxygen and experiences reduced strain, allowing for better healing and recovery following a myocardial infarction.
Correct Answer is ["A","B","D"]
Explanation
Choice A rationale:
Pain relief is a primary benefit of morphine administration in the setting of myocardial infarction.
Pain can trigger a stress response, leading to increased heart rate, blood pressure, and myocardial oxygen demand.
Morphine effectively reduces pain, thereby lessening the stress response and its detrimental effects on the heart.
This helps to minimize myocardial ischemia and potential further damage to the heart muscle.
Pain control also improves patient comfort and overall well-being, which can indirectly contribute to better cardiac outcomes.
Choice B rationale:
Sedation is another important benefit of morphine in this context.
It promotes rest and relaxation, which can lower heart rate, blood pressure, and myocardial oxygen demand.
This is crucial for patients with myocardial infarction, as their hearts require reduced workload to heal and recover.
Sedation also helps to alleviate anxiety and agitation, which can further strain the heart.
By inducing a state of calmness, morphine can indirectly protect the heart from additional stress.
Choice C rationale:
While morphine does have diuretic effects, increasing urinary output is not a primary goal in the management of myocardial infarction.
In fact, excessive diuresis could potentially lead to dehydration and hypotension, which could be detrimental to cardiac function.
Therefore, while morphine may slightly increase urine output, this is not a major reason for its use in this setting.
Choice D rationale:
Decreasing myocardial demand is a key benefit of morphine administration in patients with myocardial infarction.
Morphine achieves this by:
Reducing pain and the associated stress response
Promoting sedation and relaxation
Diminishing anxiety and agitation
Exerting a direct vasodilatory effect on blood vessels
This collective action of morphine leads to a decrease in heart rate, blood pressure, and the heart’s overall workload.
As a result, the heart requires less oxygen and experiences reduced strain, allowing for better healing and recovery following a myocardial infarction.
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