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) Simultaneously palpating both arteries to compare amplitude: Palpating both carotid arteries simultaneously is contraindicated as it can obstruct blood flow to the brain, potentially causing a decrease in cerebral perfusion and leading to syncope or other complications. Each artery should be palpated one at a time to prevent this risk.

B) Auscultating the artery at the base of the neck at the carotid bifurcation: The correct technique for assessing for carotid artery blockage is to auscultate the artery at the carotid bifurcation, which is located at the base of the neck. The nurse should use the bell of the stethoscope to listen for bruits, which are abnormal sounds caused by turbulent blood flow due to narrowing or blockage of the artery. This is a non-invasive method used to detect vascular abnormalities.

C) Listening with the diaphragm of the stethoscope to assess for bruits: The diaphragm of the stethoscope is generally used for high-pitched sounds like lung and bowel sounds. For auscultating bruits, the bell of the stethoscope is preferred because it is more sensitive to low-pitched sounds, which are characteristic of bruits caused by turbulent blood flow in narrowed arteries.

D) Instructing the client to take deep breaths during auscultation: Instructing the client to take deep breaths is unnecessary and could alter the sound being auscultated. The nurse should have the client breathe normally to avoid interference with the auscultation of the carotid arteries. The goal is to listen for any abnormal sounds (bruits) without any external factors affecting the findings.

A. The partner places the client's arm above the level of the client's heart B. The partner centres the cuff bladder over the client's brachial artery C. The partner wraps the blood pressure cuff around the client's using firm pressure D. The partner checks the instrument gauge to ensure the reading starts at zero

Correct Answer is A

Explanation

A) The partner places the client's arm above the level of the client's heart:
This action indicates that further instruction is needed. For an accurate blood pressure reading, the arm should be at heart level (approximately at the level of the fourth intercostal space) when taking the measurement. If the arm is placed above the heart, it can result in a falsely low reading. If the arm is positioned below the heart, it can lead to a falsely high reading. The position of the arm is crucial for obtaining an accurate blood pressure measurement.

B) The partner centres the cuff bladder over the client's brachial artery:
This is the correct technique. The cuff bladder should be centered over the brachial artery for accurate readings. Proper cuff placement ensures the best possible measurement and avoids errors in reading due to misplacement.

C) The partner wraps the blood pressure cuff around the client's arm using firm pressure:
This is also correct. The cuff should be wrapped snugly around the upper arm with firm pressure to ensure that it fits properly. If the cuff is too loose or too tight, it may give inaccurate readings. However, it should never be excessively tight.

D) The partner checks the instrument gauge to ensure the reading starts at zero:
This is a correct action. Before using a blood pressure cuff, it is important to check that the gauge starts at zero when the cuff is deflated. This ensures the manometer is calibrated properly and provides accurate readings. If the gauge does not start at zero, it should be recalibrated or replaced.

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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?

Nursing Test Bank

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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