Answer to Question 1
B
Fosfomycin has been approved for single-dose therapy of UTIs in women. Vancomycin and az-treonam are not indicated for UTIs. Bactrim is indicated for UTIs, but administration of a single dose is not therapeutic.
Answer to Question 2
A
Yellow halos around lights indicate digoxin toxicity. The use of furosemide increases the risk of hypokalemia, which in turn potentiates digoxin toxicity. The patient should also be assessed for headache, nausea, and vomiting, and blood should be drawn for measurement of the serum di-goxin level. The nurse should not withhold the dose of furosemide until further assessment is done, including measurement of a serum digoxin level. No evidence indicates that the patient is in worsening heart failure. Documentation of findings is secondary to further assessment and prevention of digoxin toxicity.