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Difficulty: MediumGynecologic Infections

During a routine prenatal visit at 24 weeks gestation, a primigravid patient reports new-onset, intense vulvar pruritus accompanied by a thick, white vaginal discharge over the past four days. She recently completed a course of cephalexin for an uncomplicated urinary tract infection. She denies any pelvic pain, uterine contractions, or leakage of fluid. Vital signs are within normal limits. Pelvic examination reveals marked vulvar erythema and a thick, adherent, curd-like discharge in the vaginal vault. The vaginal pH is 4.2. Microscopic evaluation of the vaginal secretions mixed with 10% potassium hydroxide demonstrates budding yeasts and branching tubular structures. Which of the following is the most appropriate management for this patient's current symptoms?

  1. Intravaginal clotrimazole therapy for 7 daysAnswer
  2. B
    Oral fluconazole as a single dose
  3. C
    Oral metronidazole for 7 days
  4. D
    Intravaginal clindamycin therapy for 7 days
  5. E
    Reassurance and routine prenatal care

Answer

Intravaginal clotrimazole therapy for 7 days
The correct answer is intravaginal clotrimazole therapy for 7 days. This patient exhibits classic signs of vulvovaginal candidiasis (VVC), including severe pruritus, a thick, white, curd-like discharge, vulvar erythema, and a normal vaginal pH (less than 4.5). The diagnosis is definitively confirmed by the presence of budding yeasts and pseudohyphae on a potassium hydroxide (KOH) preparation. VVC is particularly common in pregnancy due to elevated estrogen levels, and recent antibiotic use (such as cephalexin) further disrupts normal vaginal flora, facilitating yeast overgrowth. For pregnant women, the Centers for Disease Control and Prevention (CDC) and the American College of Obstetricians and Gynecologists (ACOG) recommend topical vaginal azoles (such as clotrimazole or miconazole) applied for 7 days. These local therapies have minimal systemic absorption and are safe for the fetus.

Step-by-Step Solution

1
Evaluate the patient's symptoms and physical examination findings.
Intense vulvar pruritus, vulvar erythema, and a thick, curd-like vaginal discharge are identified.
These are the classic clinical hallmarks of vulvovaginal candidiasis (VVC).
2
Analyze the diagnostic test results (vaginal pH and wet mount).
The vaginal pH is normal (4.2), and the KOH preparation reveals budding yeasts and pseudohyphae.
A normal pH (<4.5) combined with the visualization of yeast forms confirms the diagnosis of VVC, effectively ruling out bacterial vaginosis and trichomoniasis.
3
Determine the appropriate pharmacotherapy given the patient's pregnant state.
Intravaginal clotrimazole for 7 days is selected.
During pregnancy, topical azoles applied for 7 days are the recommended first-line therapy, whereas systemic oral fluconazole is avoided due to potential teratogenic effects.

Key Concept

Vulvovaginal candidiasis in pregnancy should be treated with a 7-day course of a topical azole (e.g., clotrimazole) rather than oral fluconazole, which carries potential risks of fetal harm.
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Topics

Gynecologic Infections

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