A nurse is listening to the heart sounds of a client. What information about S2 sounds should the nurse recognize as accurate?

S2 indicates the beginning of diastole

S2 coincides with the carotid artery pulse

S2 is caused by the closure of the semilunar valves

S2 is louder than an S1

Answer and Explanation

The Correct Answer is C

A) S2 indicates the beginning of diastole:
While S2 does coincide with the end of systole and the beginning of diastole, this statement is not the most specific or accurate way to describe the S2 heart sound. S2 marks the closure of the semilunar valves (the aortic and pulmonic valves), which occurs at the end of systole, just before diastole begins. While it is true that the S2 sound occurs as the heart transitions from systole to diastole, the closure of the semilunar valves is the more specific cause of S2.

B) S2 coincides with the carotid artery pulse:
This statement is not accurate. S2 does not exactly coincide with the carotid pulse. The S2 sound is heard slightly after the pulse due to the time it takes for the mechanical contraction of the heart to produce the sound. The carotid pulse typically corresponds more closely with the closure of the atrioventricular (AV) valves and the beginning of systole (S1), not S2. The timing of S2 and the carotid pulse can be close, but they are not perfectly synchronized.

C) S2 is caused by the closure of the semilunar valves:
This is the correct explanation. S2 is the heart sound produced by the closure of the semilunar valves (the aortic and pulmonic valves). The closing of these valves marks the end of systole and the beginning of diastole. S2 is typically described as having two components: the A2 sound (closure of the aortic valve) and the P2 sound (closure of the pulmonic valve). In some cases, particularly during inspiration, A2 and P2 may be heard separately, producing a split S2 sound.

D) S2 is louder than an S1:
This statement is not accurate. In general, S1 is louder than S2 at the apex of the heart (the lower part of the chest). S2 is louder than S1 at the base of the heart (near the sternum), particularly over the aortic and pulmonic areas. The loudness of heart sounds varies based on the location of auscultation, but it is not universally true that S2 is always louder than S1. The intensity of each sound depends on various factors, including the position of the listener and the health of the heart valves.

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Correct Answer is B

Explanation

A) Inspection of the shape and configuration of the chest during normal breathing:
While inspecting the shape and configuration of the chest can provide important information about potential deformities or abnormalities (such as a barrel chest or scoliosis), it does not directly assess the symmetry of chest expansion. Inspection primarily focuses on the external appearance rather than the physiological movement of the chest wall during respiration. Symmetry of chest expansion requires more than visual observation; it involves assessing the movement of the chest during inhalation and exhalation.

B) Placing hands sideways on the posterolateral chest wall with thumbs pointing together at the level of T9 or T10:
This technique is the most effective for confirming symmetric expansion of the chest. The nurse places their hands on the patient's back, with the thumbs positioned at the level of T9 or T10, and asks the patient to take a deep breath. As the patient inhales, the nurse assesses the expansion of both sides of the chest by observing whether the thumbs move apart symmetrically. This test directly evaluates the expansion of the lungs and chest wall during respiration and is the most accurate way to assess symmetry.

C) Percussion of the posterior chest to initiate vibration of the lung structures:
Percussion is a technique used to assess the underlying lung tissue and the presence of conditions like pneumonia, fluid accumulation, or air trapping. It does not directly assess the symmetry of chest expansion. While percussion may provide valuable diagnostic information about the lungs, it does not help in determining how evenly the chest is expanding during normal breathing.

D) Placing the palmar surface of the fingers of one hand against the chest and having the client repeat "ninety-nine":
This technique refers to vocal fremitus, where the nurse places their hands on the client's chest while the client repeats "ninety-nine." It helps assess the transmission of sound vibrations through the chest wall, which can be used to detect areas of consolidation or fluid in the lungs. However, it does not directly evaluate the symmetry of chest expansion. The vibration felt on both sides of the chest may be different in cases of lung disease, but this test does not assess the movement of the chest during breathing.

A. Atelectatic crackles that do not have a pathologic cause B. Fine crackles that may be a sign of impending pneumonia C. Vesicular breath sounds D. Fine wheezes

Correct Answer is A

Explanation

A) Atelectatic crackles that do not have a pathologic cause:
Atelectatic crackles are short, popping, crackling sounds heard during auscultation, typically occurring at the end of inspiration. These crackles are often heard in the bases of the lungs, particularly when the client is in a supine position, and are not associated with any pathological condition. Atelectatic crackles are a normal finding, especially in a sleeping or newly awakened client, as they result from the temporary collapse of small airways that quickly re-expand. Since they disappear after a few breaths and are not indicative of disease, they should be documented as atelectatic crackles without a pathological cause.

B) Fine crackles that may be a sign of impending pneumonia:
Fine crackles are high-pitched, popping sounds that are often heard during inspiration, especially at the lung bases. They are commonly associated with conditions like pneumonia, heart failure, or pulmonary fibrosis. However, in this case, the crackles heard stopped after a few breaths, which is characteristic of atelectatic crackles rather than fine crackles associated with pathological conditions. Fine crackles that last and occur consistently may suggest pathology, but in this scenario, the transient nature of the sounds points to atelectatic crackles, not pneumonia.

C) Vesicular breath sounds:
Vesicular breath sounds are normal lung sounds heard over the peripheral lung fields, characterized by a soft, low-pitched sound during inspiration, with a shorter expiration. These sounds are different from crackles, which are brief, popping sounds. Vesicular breath sounds do not refer to abnormal or adventitious sounds, such as the crackles heard in this client. Therefore, the nurse should not document the breath sounds as vesicular.

D) Fine wheezes:
Wheezes are continuous musical sounds produced by the narrowing of the airways, typically heard during exhalation. They are usually caused by conditions like asthma, chronic obstructive pulmonary disease (COPD), or bronchitis. The crackling sounds described in the question are not wheezes, as they are short, popping sounds rather than musical, continuous sounds. The transient nature of the sounds makes them more consistent with atelectatic crackles, not wheezes.

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A nurse is listening to the heart sounds of a client. What information about S2 sounds should the nurse recognize as accurate?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is B

Explanation

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Correct Answer is A

Explanation

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