Auscultation of the heart sounds will result in a lubb-dupp sound when using the bell and the diaphragm of the stethoscope. The lub part of the sound is caused by the:
opening of the AV valves
closing of the semilunar valves
closing of the AV valves
opening of the semilunar valves
The Correct Answer is C
A. Opening of the AV valves – The AV (atrioventricular) valves open silently during diastole; they do not create the "lub" sound.
B. Closing of the semilunar valves – The closing of the semilunar valves (aortic and pulmonary) produces the "dupp" sound, not the "lub."
C. Closing of the AV valves – The first heart sound (S1), or "lub," occurs when the mitral and tricuspid (AV) valves close at the beginning of systole.
D. Opening of the semilunar valves – The semilunar valves open silently during ventricular contraction; they do not produce the "lub" sound.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Assess for level of consciousness and orientation – Level of consciousness (LOC) and orientation are crucial in evaluating neurological status, overall health, and potential signs of deterioration. This assessment provides immediate information about the patient’s cognitive function and responsiveness.
B. Check for pitting edema – Assessing for pitting edema is important but is not the first priority unless the patient has signs of fluid overload or heart failure.
C. Assess the skin – Skin assessment is essential but should be performed after ensuring the patient's neurological stability.
D. Listen to lung sounds – While lung auscultation is an important part of the assessment, it follows after assessing consciousness and orientation.
Correct Answer is C
Explanation
A. Bruits – Bruits are vascular sounds caused by turbulent blood flow, typically heard over arteries.
B. Crackles – Crackles (rales) are discontinuous, crackling breath sounds caused by fluid in the alveoli, often heard in pneumonia or heart failure.
C. Wheezing – Wheezing is a high-pitched, whistling sound heard during breathing, usually caused by narrowed airways due to asthma, bronchitis, or allergic reactions.
D. Turgor – Turgor refers to skin elasticity and is used to assess hydration status, not lung sounds.
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