A 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 -• Erb's Point

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

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

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

Answer and Explanation

The Correct Answer is D

A) AV node → SA node → bundle of His → Erb's Point:
This sequence is incorrect because the electrical impulse of the heart starts at the SA (sinoatrial) node, not the AV (atrioventricular) node. The SA node is the natural pacemaker of the heart, initiating the electrical signal. The correct order of conduction is SA node → AV node → bundle of His → bundle branches, and finally, the Purkinje fibers. Erb's Point is an anatomical reference point for auscultation, not part of the electrical conduction pathway.

B) Bundle of His → AV node → SA node → Erb's Point:
This sequence is also incorrect. The electrical impulse originates at the SA node, not the bundle of His. The SA node stimulates the AV node, which in turn sends the signal to the bundle of His and then to the bundle branches. This pathway is essential for coordinating the contraction of the heart muscle, starting from the atria and moving to the ventricles.

C) AV node → SA node → bundle of His → bundle branches:
This sequence is reversed and incorrect. The impulse starts at the SA node, not the AV node. The SA node fires first, sending the electrical signal to the AV node, and then the signal travels down the bundle of His, into the left and right bundle branches, and finally to the Purkinje fibers.

D) SA node → AV node → bundle of His → bundle branches:
This is the correct sequence of the electrical conduction pathway of the heart. The electrical impulse originates at the SA node (the heart's natural pacemaker), then travels to the AV node, where it is delayed to allow the atria to contract and fill the ventricles. From there, the impulse moves down the bundle of His, which splits into the left and right bundle branches, leading to the Purkinje fibers that transmit the impulse throughout the ventricles, causing them to contract. This sequence ensures proper coordination and timing of the heart's contractions.

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Correct Answer is D

Explanation

A) Crackles: Crackles are abnormal lung sounds often associated with conditions such as pneumonia, heart failure, or pulmonary edema. They result from fluid in the airways or alveoli. However, crackles are not typically the primary finding in pleuritis, which involves inflammation of the pleura.

B) Stridor: Stridor is a high-pitched wheezing sound caused by an obstruction or narrowing of the upper airway, often seen in conditions such as croup or anaphylaxis. It is not characteristic of pleuritis, which involves inflammation of the pleura and not airway obstruction.

C) Dyspnea: Dyspnea, or difficulty breathing, is a common symptom in many respiratory conditions, including pleuritis. While pleuritis can lead to discomfort during breathing, dyspnea itself is not a sound that would be auscultated. It’s a subjective feeling that would be noted during the client’s history or verbal report, rather than an auscultatory finding.

D) Friction rub: A pleural friction rub is the most expected finding when auscultating a client with pleuritis. This sound occurs when the inflamed pleural layers rub against each other during breathing, producing a grating, scratchy sound. The nurse will typically hear this sound best on inspiration or expiration and it is the hallmark sign of pleuritis. The presence of a friction rub indicates the pleural inflammation characteristic of this condition.

A. The pupils constrict when the examiner's index finger slowly moves toward the client's nose B. The client's peripheral vision becomes sharper the examiner shines a light over the pupils C. The pupils dilate when the examiner's finger slowly moves toward the client's nose D. The client involuntary blinks in the of bright light directed the pupils during the eye exam

Correct Answer is A

Explanation

A) The pupils constrict when the examiner's index finger slowly moves toward the client's nose: This is the correct description of the process of visual accommodation. Visual accommodation refers to the ability of the eyes to focus on a near object. When the examiner's finger is moved toward the client's nose, the pupils should constrict to focus the light on the retina. This response is an indicator that the client’s eyes are properly adjusting to focus on a close object.

B) The client's peripheral vision becomes sharper when the examiner shines a light over the pupils: This is not correct, as shining a light over the pupils is related to assessing the pupillary light reflex, not visual accommodation. Visual accommodation focuses on the ability to focus on a near object, while peripheral vision is related to the ability to see objects outside of the central vision, and is not influenced by the light shining directly into the pupil.

C) The pupils dilate when the examiner's finger slowly moves toward the client's nose: This is incorrect. When assessing visual accommodation, the pupils should constrict (become smaller) as the object moves closer to the face, not dilate. Dilation of the pupils would suggest a lack of accommodation and could indicate a neurological or eye condition.

D) The client involuntarily blinks in the presence of bright light directed at the pupils during the eye exam: This describes the corneal reflex, which is a response to bright light or a foreign object approaching the eye, rather than a test of visual accommodation. This reflex is mediated by the trigeminal nerve and is unrelated to the accommodation response, which focuses on the pupil's reaction to near objects.

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

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A client diagnosed with pleuritis has been admitted to the hospital and complains of pain with breathing. Which of the following assessment findings should the nurse expect when auscultating a client with pleuritis?

Correct Answer is D

Explanation

A nurse is testing a client's visual accommodation. Which of the following should the nurse recognize as an assessment finding from visual accommodation?

Correct Answer is A

Explanation

A nurse is assessing the carotid arteries of a client diagnosed with cardiovascular disease. What action should be performed next by the nurse when assessing the carotid arteries in this client?

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A nurse is performing an assessment of an adult client and observes unequal chest expansion. The nurse should recognize that unequal chest expansion I occur for which reason?

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