A nurse is preparing to administer mannitol via continuous IV infusion to a client.
Which of the following findings should the nurse identify as an expected outcome of this medication therapy?

Choice A rationale

Bronchospasm is a constriction of the airways, commonly seen in respiratory conditions like asthma. It is mediated by inflammatory responses and smooth muscle contraction in the bronchi. Acetazolamide, a carbonic anhydrase inhibitor, does not typically cause bronchospasm; its primary effects are on fluid and electrolyte balance and intraocular pressure.

Choice B rationale

Constipation is a common gastrointestinal symptom characterized by infrequent or difficult bowel movements. It can be caused by various factors, including dietary habits, medications, and underlying medical conditions. Acetazolamide's mechanism of action, involving inhibition of carbonic anhydrase, does not directly lead to constipation as a significant adverse effect.

Choice C rationale

Diplopia, or double vision, is a visual disturbance where a single object appears as two. It can result from ocular muscle weakness, nerve damage, or other neurological conditions. Acetazolamide's therapeutic effects are on aqueous humor production in the eye to reduce intraocular pressure, but diplopia is not a recognized adverse effect of this medication.

Choice D rationale

Acetazolamide is a carbonic anhydrase inhibitor that promotes the excretion of bicarbonate, sodium, potassium, and water. This diuretic action can lead to metabolic acidosis, hypokalemia (normal range: 3.5-5.0 mEq/L), and hyponatremia (normal range: 135-145 mEq/L) due to increased renal excretion, hence requiring close monitoring of electrolyte balance.

Choice A rationale

Tuberculosis is a bacterial infection primarily affecting the lungs, caused by *Mycobacterium tuberculosis*. Didanosine is an antiretroviral medication, specifically a nucleoside reverse transcriptase inhibitor (NRTI), and as such, it does not possess antimicrobial activity against bacterial pathogens like *Mycobacterium tuberculosis*. Therefore, it is not indicated for treating tuberculosis.

Choice B rationale

Human immunodeficiency virus (HIV) is a retrovirus that attacks the body's immune system. Didanosine is an antiretroviral drug that inhibits the replication of HIV by interfering with the reverse transcriptase enzyme, which is crucial for the virus to convert its RNA into DNA. This mechanism of action effectively reduces the viral load and improves immune function in individuals with HIV infection.

Choice C rationale

Bacterial meningitis is an inflammation of the meninges, the membranes surrounding the brain and spinal cord, caused by various bacterial species. Didanosine is an antiviral agent specifically targeting retroviruses like HIV. It does not have any direct antibacterial properties or efficacy against the common bacterial pathogens responsible for meningitis, thus making it an inappropriate treatment.

Choice D rationale

Syphilis is a sexually transmitted infection caused by the bacterium *Treponema pallidum*. The primary treatment for syphilis is antibiotics, particularly penicillin. Didanosine, being an antiretroviral medication, does not exhibit any treponemicidal activity and is ineffective against *Treponema pallidum*. Therefore, it is not used in the treatment of syphilis.