The nurse performs the caloric test to assess the abnormal nystagmus, tinnitus, or hearing loss that is the result of:
1. Vestibular dysfunction.
2. Ruptured tympanic membrane.
3. Chronic otitis externa.
4. Chronic sinusitis.
Vestibular dysfunction.
Rationale: The caloric test can differentiate eight cranial nerve lesions that result in vestibular dysfunction. Noise exposure and chronic otitis externa can cause hearing loss but the loss is not due to vestibular dysfunction. A ruptured tympanic membrane and chronic otitius externa do not cause nystaymus or tinnitus. Chronic sinusitis does not cause nystagmus, tinnitus, or hearing loss.
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