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 A

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. Indicates the beginning of diastole: This statement is not accurate. S2, the second heart sound, indicates the end of systole and the beginning of diastole. It is specifically associated with the closure of the aortic and pulmonary valves.

B. Coincides with the carotid artery pulse: This statement is not accurate. S2 is associated with the closure of the aortic and pulmonary valves in the heart, not with the carotid artery pulse.

C. Is louder than an S1: This statement is not accurate. S1, the first heart sound, is usually louder than S2. S1 is associated with the closure of the mitral and tricuspid valves and marks the beginning of systole.

D. Is caused by the closure of the semilunar valves: This statement is accurate. S2 is caused by the closure of the aortic and pulmonary valves, which are the semilunar valves in the heart. It marks the end of systole and the beginning of diastole.

A. Discuss that a light will be directed at the neck to observe for pulsations of the artery B. instruct the client to take a deep breath and "hold" while the nurse briefly auscultates C. Demonstrate that both arteries will be palpated simultaneously to compare amplitude D. Show the client the diaphragm of the stethoscope that will be placed on the neck

Correct Answer is C

Explanation

A. Discuss that a light will be directed at the neck to observe for pulsations of the artery:

This choice is incorrect. Directing light at the neck is not a standard method for assessing carotid artery pulsations. The carotid artery is usually assessed by palpation to feel the pulse rather than visual observation.

B. Instruct the client to take a deep breath and "hold" while the nurse briefly auscultates:

This choice is incorrect. Auscultation is typically not used to assess carotid artery pulsations. Palpation (feeling the pulse) is the primary method used for this assessment.

C. Demonstrate that both arteries will be palpated simultaneously to compare amplitude:

This choice is correct. Palpating both carotid arteries simultaneously allows the nurse to compare the amplitude (strength) of the pulses. This comparison helps in assessing the symmetry of the pulses and ensures there are no significant differences between the two sides, which could indicate vascular abnormalities.

D. Show the client the diaphragm of the stethoscope that will be placed on the neck:

This choice is incorrect. The diaphragm of the stethoscope is not typically used for palpating pulses. Palpation involves using the fingertips to feel the pulse and assess its strength and regularity.

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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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