The nurse is asked to describe what the heart sound S2 represents. What would be the correct response by the nurse?
Closure of the pulmonic and mitral valves
Closure of the tricuspid and mitral valves
Closure of the aortic and pulmonic valves
Closure of the aortic and mitral valves
Closure of the pulmonic and tricuspid valves
The Correct Answer is C
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.
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Correct Answer is C
Explanation
A. A barrel chest is a common finding in patients with emphysema due to lung hyperinflation but is not immediately life-threatening.
B. A respiratory rate of 22 per minute indicates mild tachypnea, which can be expected in patients with COPD, but is not the most alarming sign.
C. Oral cyanosis is a concerning sign that indicates inadequate oxygenation and can suggest severe respiratory distress or failure, necessitating immediate intervention.
D. Decreased lung sounds on expiration can occur in emphysema but is not as critical as the presence of cyanosis.
E. Pursed-lip expiration is a compensatory mechanism used by patients with COPD to improve breathing efficiency; it is generally a positive adaptive strategy.
Correct Answer is D
Explanation
A. Hyperresonance is often heard in cases of pneumothorax or emphysema, not pneumonia.
B. Bubbling is not a percussed sound but rather a description of breath sounds or fluid.
C. Tympany is typically heard over hollow organs like the stomach and is not expected in lung assessment.
D. Dullness over lung tissue indicates fluid or consolidation, as seen in pneumonia.
E. Resonance is normal over healthy lung tissue but would not be expected over areas of consolidation.