The nurse is reviewing the sequence of the cardiac cycle. The nurse recognizes that the electrical stimulus of the cardiac cycle follows which sequence?

AV node-SA node bundle of His- bundle branches

SA node- AV node-bundle of His -bundle branches

Bundle of His- AV node- SA node- Erb's Point

AV node-SA node-bundle of His- Erb's Point

Answer and Explanation

The Correct Answer is B

A. AV node - SA node - bundle of His - bundle branches:

This sequence is incorrect. The SA node (sinoatrial node) initiates the electrical impulse in the heart, followed by the AV node (atrioventricular node), bundle of His, and then the bundle branches.

B. SA node - AV node - bundle of His - bundle branches:

This sequence is correct. The electrical stimulus of the cardiac cycle starts at the SA node, which is the natural pacemaker of the heart. From the SA node, the impulse travels to the AV node, then to the bundle of His, and finally to the bundle branches, which distribute the impulse to the ventricles, causing them to contract.

C. Bundle of His - AV node - SA node - Erb's Point:

This sequence is incorrect. Erb's Point is a point on the chest where heart sounds S2 and S3 can be heard most distinctly.

D. AV node - SA node - bundle of His - Erb's Point:

This sequence is incorrect. The AV node comes after the SA node in the electrical conduction system of the heart. Erb's Point is not a part of the normal cardiac conduction pathway; it is a location for auscultation on the chest.

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Correct Answer is D

Explanation

A. Listening for all possible sounds at a time at each specified area: This approach does not allow for specific localization of different heart sounds and murmurs, making it difficult to accurately assess the heart's condition.

B. Listening to the sounds at the aortic, tricuspid, pulmonic, and mitral areas: This option is close but lacks the systematic approach of method D. Listening at specific anatomical locations (aortic, tricuspid, pulmonic, mitral) is important, but the Z pattern allows for thorough coverage and precise localization of any abnormal sounds.

C. Listening to the sounds only at the site where the apical pulse is felt to be the strongest: This method does not cover all the important auscultation sites on the heart and may miss significant findings.

D. Listening by inching the stethoscope in a rough Z pattern, from the base of the heart across and down, then over to the apex: This technique involves a systematic approach where the nurse listens at specific locations in a structured manner, ensuring comprehensive coverage of the heart sounds and murmurs.

A. Percussion of the posterior chest B. Inspection of the shape and configuration of the chest wall C. Placing the palmar surface of the fingers of one hand against the chest and having the client repeat "ninety nine" D. Placing hands sideways on the posterolateral chest wall with thumbs pointing together at the level of T9 or T10

Correct Answer is D

Explanation

A. Percussion of the posterior chest: Percussion helps assess the underlying structures of the chest but does not directly confirm symmetric chest expansion.

B. Inspection of the shape and configuration of the chest wall: Inspection is a crucial part of assessing chest symmetry. Any deformities, asymmetry, or abnormalities in the shape and configuration of the chest wall can be visually identified.

C. Placing the palmar surface of the fingers of one hand against the chest and having the client repeat "ninety-nine": This technique, known as tactile fremitus, involves feeling for vibrations or tremors while the client repeats a phrase. While it can provide information about underlying lung conditions, it's not primarily used to confirm symmetric chest expansion.

D. Placing hands sideways on the posterolateral chest wall with thumbs pointing together at the level of T9 or T10: This technique, known as chest expansion measurement, is used to assess symmetric chest expansion. Placing hands in this manner allows the nurse to feel for bilateral chest expansion during inspiration, ensuring that both sides of the chest expand symmetrically.

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The nurse is reviewing the sequence of the cardiac cycle. The nurse recognizes that the electrical stimulus of the cardiac cycle follows which sequence?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is D

Explanation

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Correct Answer is D

Explanation

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