Recognizing the role of the kidney in the production of erythropoietin, the nurse assesses a client with chronic kidney disease (CKD) for which clinical manifestation?

Choice A reason: Tissue ischemia from vasospasm is associated with conditions like stroke, not multiple sclerosis (MS). MS involves immune-mediated demyelination of the central nervous system, causing exacerbations. Ischemia does not drive MS exacerbations, making this incorrect, as scarring of the myelin sheath is the hallmark pathological change.

Choice B reason: Destruction of norepinephrine receptors is unrelated to multiple sclerosis. MS exacerbations result from immune attacks on myelin, leading to scarred plaques that disrupt nerve conduction. Norepinephrine receptor issues may affect autonomic functions, but they are not part of MS’s pathophysiology, making this an incorrect choice.

Choice C reason: Multiple sclerosis exacerbations result from immune-mediated destruction and scarring (sclerosis) of the myelin sheath, forming plaques that impair nerve signal transmission. This causes neurological symptoms like weakness or sensory loss. Progressive demyelination and scarring are the core pathologic changes, aligning with MS’s clinical and histopathological features.

Choice D reason: Over-secretion of excitatory neurotransmitters may occur in epilepsy or neurotoxicity, not multiple sclerosis. MS exacerbations stem from myelin sheath scarring, disrupting nerve conduction, not neurotransmitter imbalances. This choice is incorrect, as it does not reflect the immune-driven demyelination central to MS’s pathological process.

Choice A reason: Mixed sensorineural-conductive hearing loss involves both inner ear and middle ear pathology. Ototoxic medications primarily damage cochlear hair cells, causing sensorineural loss. Mixed loss requires dual mechanisms (e.g., infection and ototoxicity), which are less likely than pure sensorineural loss from medication in this acute scenario.

Choice B reason: Presbycusis is age-related sensorineural hearing loss, not medication-induced. Ototoxic drugs cause acute, bilateral sensorineural loss by damaging cochlear hair cells, unrelated to aging. The client’s new onset loss linked to medication points to ototoxicity, not presbycusis, making this an incorrect type for this scenario.

Choice C reason: Conductive hearing loss results from middle ear or external ear issues, like wax or ossicle damage. Ototoxic medications target inner ear hair cells, causing sensorineural loss. Conductive loss is unrelated to ototoxicity, as drugs do not affect sound conduction, making this incorrect for medication-induced hearing loss.

Choice D reason: Sensorineural hearing loss is caused by ototoxic medications, which damage cochlear hair cells or auditory nerves, impairing sound processing. Bilateral, new-onset loss aligns with ototoxicity’s pathophysiology, as seen with drugs like aminoglycosides. This is the expected type, supported by audiology evidence linking ototoxins to inner ear damage.