The nurse educates a patient diagnosed with a UTI.
Which diet choices should be avoided to prevent bladder irritation?

Choice A rationale

Stopping topical fluorouracil when the skin appears worse is incorrect. The medication often causes an inflammatory reaction, including erythema, crusting, and erosion, which indicates the drug is working by causing cellular necrosis of abnormal cells. Premature discontinuation compromises treatment efficacy and may lead to inadequate destruction of cancerous cells, necessitating prolonged or alternative therapies.

Choice B rationale

Avoiding sun exposure while using topical fluorouracil is crucial due to the medication's photosensitizing properties. Fluorouracil enhances the skin's sensitivity to ultraviolet radiation, increasing the risk of severe sunburn, erythema, and blistering. This phototoxicity can exacerbate local inflammatory reactions and compromise treatment outcomes, necessitating strict photoprotection.

Choice C rationale

Applying topical fluorouracil only to affected areas is essential to minimize systemic absorption and reduce adverse effects on healthy skin. Fluorouracil is a cytotoxic agent that nonspecifically inhibits DNA and RNA synthesis, leading to cell death. Accidental application to unaffected skin can cause unnecessary irritation, inflammation, and discomfort without therapeutic benefit.

Choice D rationale

Washing hands before and after applying topical fluorouracil is a fundamental infection control and safety measure. Handwashing before application prevents the introduction of microbes to the treatment site, reducing infection risk. Post-application handwashing removes residual medication, preventing accidental transfer to other body parts or individuals, minimizing systemic exposure.

Choice A rationale

The genitourinary tract itself can be the site of infection, but E. coli, a common cause of UTIs, primarily originates from the gastrointestinal tract. While the genitourinary system is affected, it's typically a result of ascending bacterial migration rather than the primary source of the E. coli.

Choice B rationale

Gram-negative bacilli, specifically Escherichia coli (E. coli), are normal inhabitants of the human gastrointestinal tract. Due to anatomical proximity, E. coli can easily migrate from the perianal region to the urethra and ascend into the bladder, causing urinary tract infections.

Choice C rationale

The integumentary tract, or skin, primarily hosts a different microbial flora, predominantly gram-positive bacteria like Staphylococcus and Streptococcus species. While skin can be a source of infection, it is not the typical reservoir for E. coli causing urinary tract infections.

Choice D rationale

The nasopharyngeal tract primarily harbors respiratory pathogens such as Streptococcus pneumoniae or Haemophilus influenzae. It is not the source of gram-negative bacilli like E. coli that commonly cause urinary tract infections. Transmission routes for these pathogens are distinct.