(1 point). Listen.
A nurse is asked what causes infective endocarditis.
What is the nurse's best answer?
Infective endocarditis is most often caused by:.
Viruses.
Bacteria.
Fungi.
Autoimmunity.
The Correct Answer is C
Choice A rationale:
Infective endocarditis is most often caused by bacteria. This condition occurs when bacteria enter the bloodstream and adhere to the inner lining of the heart's chambers or valves, leading to infection. Viruses, fungi, and autoimmunity can also cause endocarditis, but bacterial endocarditis is the most common and typical form.
Choice B rationale:
While viruses can cause infective endocarditis, they are not the most common cause. Bacterial endocarditis is far more prevalent and frequently encountered in clinical practice.
Choice D rationale:
Fungi can cause endocarditis, but it is less common compared to bacterial endocarditis. Fungal endocarditis often occurs in individuals with compromised immune systems.
Choice E rationale:
Autoimmunity is not a primary cause of infective endocarditis. Autoimmune diseases may lead to various cardiac conditions, but they are not the primary etiology of infective endocarditis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale:
"Permits blood to flow backward" is more characteristic of valvular regurgitation rather than stenosis. This choice is not accurate in the context of valvular stenosis.
Choice B rationale:
"Fails to shut completely" is a description of valvular regurgitation, not stenosis. This is not the correct choice.
Choice C rationale:
Stenosis of a heart valve means that the valve is constricted and narrowed, limiting the flow of blood through it. This choice is accurate and describes valvular stenosis correctly.
Choice D rationale:
"Regurgitates and causes insufficiency" is a description of valvular regurgitation, not stenosis. This choice is not appropriate in this context.
Correct Answer is A
Explanation
Choice A rationale:
Systolic heart failure results in increased left ventricular preload. In systolic heart failure, the heart's ability to contract and eject blood effectively is impaired. This leads to decreased ejection fraction, which means that a significant amount of blood is left in the left ventricle at the end of systole. This increased volume of blood in the left ventricle during diastole is referred to as "preload.”. The increased preload is a compensatory mechanism that the heart uses to maintain cardiac output. However, over time, this increased preload can lead to symptoms of congestion and fluid overload.
Choice B rationale:
Systolic heart failure is characterized by decreased ejection fraction, not increased. Ejection fraction is a measure of the percentage of blood ejected from the left ventricle with each heartbeat. In systolic heart failure, this percentage is reduced.
Choice C rationale:
Systolic heart failure does not directly affect right ventricular preload. Right ventricular preload is more related to conditions that affect the right side of the heart, such as pulmonary hypertension.
Choice D rationale:
Systolic heart failure does not necessarily result in decreased right ventricular end-diastolic pressure. Right ventricular end-diastolic pressure can be influenced by a variety of factors, and its alteration is not a specific hallmark of systolic heart failure.
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