What is ejection fraction?
Percentage of blood that leaves the heart in a minute
Percentage of blood that leaves the heart with each beat
Amount of blood that leaves the heart with each beat
Amount of blood that leaves the heart in a minute
The Correct Answer is B
Choice A reason: This is not the definition of ejection fraction. The percentage of blood that leaves the heart in a minute is related to the cardiac output, which is the product of the heart rate and the stroke volume.
Choice B reason: This is the correct definition of ejection fraction. It is the ratio of the stroke volume (the amount of blood pumped by the left ventricle) to the end-diastolic volume (the amount of blood in the left ventricle at the end of diastole). It is a measure of the efficiency of the heart and reflects the contractility of the cardiac muscle.
Choice C reason: This is not the definition of ejection fraction. The amount of blood that leaves the heart with each beat is the stroke volume, which is one of the factors that determine the ejection fraction.
Choice D reason: This is not the definition of ejection fraction. The amount of blood that leaves the heart in a minute is the cardiac output, which is influenced by the ejection fraction, but not equivalent to it.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: Montelukast does not increase vessel permeability. It blocks the effects of leukotrienes, which are inflammatory mediators that cause vessel permeability, bronchoconstriction, and mucus secretion. By blocking leukotrienes, montelukast reduces vessel permeability and inflammation.
Choice B reason: Montelukast reduces bronchoconstriction and mucus secretion. It blocks the effects of leukotrienes, which are inflammatory mediators that cause bronchoconstriction and mucus secretion. By blocking leukotrienes, montelukast improves airflow and reduces asthma symptoms.
Choice C reason: Montelukast does not increase inflammation. It blocks the effects of leukotrienes, which are inflammatory mediators that cause inflammation, bronchoconstriction, and mucus secretion. By blocking leukotrienes, montelukast reduces inflammation and prevents asthma exacerbations.
Choice D reason: Montelukast does not increase bronchoconstriction. It blocks the effects of leukotrienes, which are inflammatory mediators that cause bronchoconstriction, mucus secretion, and inflammation. By blocking leukotrienes, montelukast reduces bronchoconstriction and improves airflow.
Correct Answer is D
Explanation
Choice A reason: Jugular vein distention is a sign of right-sided heart failure, not left-sided. It indicates increased pressure in the right atrium and vena cava.
Choice B reason: Peripheral edema is also a sign of right-sided heart failure, not left-sided. It indicates fluid retention in the lower extremities and abdomen.
Choice C reason: Decreased systemic vascular resistance is not a characteristic of left-sided heart failure. It is a compensatory mechanism that occurs in response to reduced cardiac output.
Choice D reason: Pulmonary congestion is a characteristic of left-sided heart failure. It indicates fluid accumulation in the lungs due to the inability of the left ventricle to pump blood effectively.
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