The nurse is asked to describe what the heart sound S1 represents. What would be the correct response by the nurse?
Closure of mitral and aortic valves
Closure of mitral and tricuspid valves
Closure of pulmonic and tricuspid valves
Closure of pulmonic and aortic valves
Closure of aortic and tricuspid valves
The Correct Answer is B
A. This option incorrectly includes the aortic valve rather than the tricuspid valve in the S1 heart sound.
B. S1 represents the closure of the mitral and tricuspid valves, which occurs at the beginning of ventricular systole and produces the "lub" sound.
C. The pulmonic valve closure is associated with the S2 heart sound, not S1.
D. The closure of the pulmonic and aortic valves occurs in S2, not S1.
E. This combination is incorrect, as S1 is associated with mitral and tricuspid valve closure.
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Correct Answer is B
Explanation
A. While posterior to anterior comparisons are used, they do not encompass the entire technique for auscultation.
B. Side-to-side comparison is the correct method as it allows for immediate assessment of differences between lung fields and helps to identify abnormal sounds effectively.
C. Interspace-by-interspace comparison is not a commonly recognized term for this method and can lead to confusion in technique.
D. Proximal to distal comparison is not specific to lung auscultation and does not effectively apply to lung assessment.
E. Top-to-bottom comparison may miss abnormalities in a specific region of the lungs; side-to-side is preferred.
Correct Answer is C
Explanation
A. The closure of the pulmonic and mitral valves corresponds to heart sound S1, not S2.
B. The tricuspid and mitral valves close with S1.
C. Heart sound S2 represents the closure of the aortic and pulmonic valves, signaling the end of systole and the beginning of diastole.
D. The mitral valve closes with S1, not S2.
E. The pulmonic and tricuspid valves do not correspond with S2.