The oculovestibular reflex, or cold caloric test,
a. should not be performed on an unconscious patient because of the risk of aspiration.
b. has an abnormal response of rapid nystagmus-like deviation to the side of the body that is tested.
c. is a routine test of the nursing neurologic examination.
d. is one of the final clinical assessments of brainstem function.
D
The oculovestibular reflex is one of the final clinical assessments of brainstem function. After confirmation that the tympanic membrane is intact, the head is raised to a 30-degree angle. Then 20 to 100 mL of ice water is injected into the external auditory canal. In a normal response, eye movement is in the direction of the injection site. An abnormal response is dysconjugate eye movement, which indicates a brainstem lesion, or no response, which indicates little to no brainstem function.
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