A nurse is preparing the client for an electrocardiogram (ECG). The client asks the nurse what is an electrocardiogram.
Which is the best description for an electrocardiogram?
Electrical representations of the cardiac cycle that are documented by deflections on recording paper.
The amount of blood ejected from the left ventricle over 1 minute.
The amount of blood that is ejected with every heartbeat.
Electrical impulses of the heart displayed on a screen.
The Correct Answer is A
Choice A rationale
The electrical representations of the cardiac cycle that are documented by deflections on recording paper are known as an electrocardiogram (ECG). ECGs provide a visual record of the heart's electrical activity, captured through electrodes placed on the body. These deflections correspond to the depolarization and repolarization phases of the heart's muscle cells, translating into P, QRS, and T waves on the ECG strip. The primary function is to diagnose arrhythmias, myocardial infarction, and other heart conditions by identifying abnormal patterns in these waves.
Choice B rationale
This choice describes cardiac output, the amount of blood ejected from the left ventricle over one minute, which is unrelated to the visual documentation of electrical activity provided by an ECG.
Choice C rationale
This choice refers to the stroke volume, the amount of blood ejected with each heartbeat, not the electrical representation of cardiac activity shown on an ECG.
Choice D rationale
This choice is partially correct but does not fully describe an ECG, which includes a detailed recording on paper rather than just visual electrical impulses on a screen.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
The Cover/Uncover test is used to assess the presence of strabismus or eye muscle weakness. During this test, one eye is covered while the other eye is observed for movement. The uncovered eye is then observed when the cover is removed. If there is a misalignment or weakness, the uncovered eye will move to re-establish focus, indicating a problem with eye muscle control.
Choice B rationale
Testing peripheral vision involves assessing the range of vision around the central focus point and is not specifically used to detect eye muscle weakness. It evaluates the function of the retina and optic nerve rather than the eye muscles. This test helps identify issues such as glaucoma or retinal detachment.
Choice C rationale
The Snellen chart test measures visual acuity, specifically how well a person can see at various distances. It is not designed to assess eye muscle strength or alignment. The test involves reading letters of different sizes from a chart placed at a standard distance.
Choice D rationale
The Weber test is an auditory test used to assess hearing loss by placing a vibrating tuning fork on the forehead or middle of the head. It helps determine whether hearing loss is conductive or sensorineural in nature. This test does not provide information about eye muscle function or alignment.
Correct Answer is D
Explanation
Choice A rationale
A decreased angle between the cuticles and the nails is not indicative of clubbing. In fact, it is often associated with healthy nails. Clubbing is recognized by changes that increase the angle between the nail bed and the cuticle.
Choice B rationale
An upward curving of the nails, known as koilonychia or spoon nails, is not characteristic of clubbing but is often associated with iron-deficiency anemia. Hence, this answer is incorrect for clubbing.
Choice C rationale
Blue nails indicate cyanosis, which is related to a lack of oxygen in the blood. This is distinct from clubbing, which is more about the shape and angle of the nails rather than their color.
Choice D rationale
Clubbing is recognized by an increase in the angle between the nail bed and the cuticle, often greater than 160 degrees. This is a hallmark feature and the correct indicator of clubbing.
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