A student nurse is reviewing for an upcoming final examination and recognizes in the ECG readings that the T wave represents which of the following?

Atrial depolarization.

Atrial repolarization.

Ventricular depolarization.

Ventricular repolarization.

Answer and Explanation

The Correct Answer is D

Choice A rationale

Atrial depolarization refers to the electrical activation of the atria, which is depicted by the P wave on an ECG, not the T wave. The P wave represents the contraction phase of the atria as it pumps blood into the ventricles. Therefore, this option is incorrect for the T wave.

Choice B rationale

Atrial repolarization is the process of the atria returning to their resting state. This repolarization is generally obscured by the QRS complex on an ECG and is not associated with the T wave. Thus, this answer choice is also incorrect.

Choice C rationale

Ventricular depolarization is represented by the QRS complex on an ECG. It indicates the ventricles are contracting to pump blood to the lungs and the rest of the body. Therefore, it does not correlate with the T wave.

Choice D rationale

Ventricular repolarization is indicated by the T wave on an ECG. This phase signifies the ventricles returning to their resting state after the contraction. It is the correct answer as it accurately reflects the T wave's function.

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Correct Answer is A

Explanation

Choice A rationale

The Romberg test evaluates equilibrium by having the client stand with feet together and eyes closed, observing for swaying or imbalance. It assesses the function of the vestibular system, proprioception, and cerebellar function, making it the most appropriate test for assessing dizziness and equilibrium.

Choice B rationale

The Weber test involves placing a tuning fork on the forehead to evaluate sound lateralization. It assesses hearing loss but not equilibrium, making it less suitable for dizziness assessment.

Choice C rationale

The Rinne test compares air and bone conduction of sound using a tuning fork. While useful for diagnosing conductive hearing loss, it does not assess equilibrium, making it inappropriate for evaluating dizziness.

Choice D rationale

The cover test evaluates eye alignment and muscle function by having the client cover one eye and observe the uncovered eye for movement. It assesses ocular motility but not equilibrium, making it unsuitable for dizziness assessment.

A. Loss of peripheral vision. B. Decreased ability to perceive colors. C. Seeing bright flashes of light and floaters. D. Loss of central vision.

Correct Answer is B

Explanation

Choice A rationale

Loss of peripheral vision is more commonly associated with glaucoma, where increased intraocular pressure damages the optic nerve. This condition leads to gradual loss of peripheral vision, often described as "tunnel vision.”. Cataracts typically do not cause this symptom.

Choice B rationale

Cataracts involve the clouding of the eye's natural lens, leading to blurred vision and decreased ability to perceive colors. The clouding scatters light, reducing the clarity of color perception and overall vision. This symptom is consistent with cataract formation.

Choice C rationale

Seeing bright flashes of light and floaters is more commonly associated with retinal detachment or posterior vitreous detachment. These conditions involve changes in the retina or vitreous humor, leading to such visual disturbances. Cataracts do not typically cause these symptoms.

Choice D rationale

Loss of central vision is more commonly associated with age-related macular degeneration (AMD), where the central part of the retina (macula) deteriorates. This condition affects central vision, making activities like reading and recognizing faces difficult. Cataracts primarily cause generalized blurred vision, not central vision loss.

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A student nurse is reviewing for an upcoming final examination and recognizes in the ECG readings that the T wave represents which of the following?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is A

Explanation

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Correct Answer is B

Explanation

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