When inspecting a patient's eyes, the nurse assesses the presence of cranial nerve III (oculomotor nerve) by observing the eyelids open and close bilaterally.
What other technique does a nurse use to test the function of this cranial nerve?
Visual acuity.
Peripheral vision.
Presence of the red reflex.
Pupillary constriction to light.
The Correct Answer is D
Choice A rationale
Visual acuity tests assess the clarity of vision and the ability to discern letters or numbers at a set distance. It is used to test the function of cranial nerve II (optic nerve) rather than cranial nerve III (oculomotor nerve). Testing visual acuity involves using eye charts and assessing each eye separately.
Choice B rationale
Peripheral vision tests evaluate the ability to see objects outside the direct line of vision and are used to test the function of cranial nerve II (optic nerve). Peripheral vision assessment helps in diagnosing conditions like glaucoma but does not test the function of cranial nerve III.
Choice C rationale
The presence of the red reflex is assessed by looking into the eye with an ophthalmoscope to check for abnormalities in the eye's posterior segment. It is not related to the function of cranial nerve III but rather indicates healthy eye structures, including the retina and optic nerve (cranial nerve II).
Choice D rationale
Pupillary constriction to light is a direct test of cranial nerve III function. The oculomotor nerve controls the constriction of the pupil in response to light. By shining a light into the eyes and observing the pupils' response, the nurse can assess the integrity of cranial nerve III.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
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.
Correct Answer is D
Explanation
Choice A rationale
Atrial depolarization is represented by the P wave on an ECG, not the QRS wave. This phase involves the electrical activation and contraction of the atria, which precedes ventricular contraction.
Choice B rationale
Ventricular repolarization is represented by the T wave, not the QRS complex. The T wave signifies the ventricles returning to their resting state.
Choice C rationale
Atrial repolarization generally occurs during the QRS complex, but it is not represented by it. The electrical activity of atrial repolarization is masked by the more significant ventricular depolarization signal of the QRS complex.
Choice D rationale
The QRS complex on an ECG represents ventricular depolarization, which is the electrical activation leading to the contraction of the ventricles. This is the correct answer as it accurately describes the QRS wave’s significance. .
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