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.
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
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.
Correct Answer is A
Explanation
Choice A rationale
The general survey is an overall assessment of a client's physical appearance, behavior, mobility, and neurological status. It provides a comprehensive overview of the client's health and well-being, making it the focus of the nurse's observations in this scenario.
Choice B rationale
Medical history includes past and current health conditions, surgeries, medications, and family health history. While important, it is not the focus of the nurse's immediate observations in this scenario.
Choice C rationale
Biographical data involves personal information such as age, gender, occupation, and marital status. While relevant to the client's health, it is not the primary focus of the nurse's observations in this scenario.
Choice D rationale
Social history includes information about the client's lifestyle, habits, and social environment. While valuable for understanding the client's overall health context, it is not the focus of the nurse's immediate observations in this scenario. .
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