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Difficulty: EasyGynecologic Infections

A 24-year-old woman comes to the clinic reporting three days of intense vaginal itching and a thick, white vaginal discharge. She denies abdominal pain, fever, or dysuria. Two weeks ago, she completed a 10-day course of amoxicillin-clavulanate for acute bacterial sinusitis. She is sexually active with one male partner and uses oral contraceptives. Vital signs are within normal limits. Pelvic examination reveals significant vulvar erythema and edema, along with thick, cottage cheese-like adherent vaginal discharge. The cervix appears normal with no motion tenderness. Vaginal pH is 4.0. Microscopic evaluation of the vaginal fluid with 10% potassium hydroxide (KOH) preparation reveals budding yeast and pseudohyphae. Which of the following is the most appropriate next step in management?

  1. Single-dose oral fluconazoleAnswer
  2. B
    Multi-day course of oral metronidazole
  3. C
    Intramuscular ceftriaxone and oral doxycycline
  4. D
    Topical clobetasol propionate
  5. E
    Single-dose oral azithromycin

Answer

Single-dose oral fluconazole is the most appropriate treatment for uncomplicated vulvovaginal candidiasis.
The patient's presentation of thick, white, cottage cheese-like discharge, severe pruritus, normal vaginal pH (4.0), and budding yeast with pseudohyphae on KOH preparation is highly diagnostic of vulvovaginal candidiasis (VVC). VVC frequently occurs after a course of broad-spectrum antibiotics, which disrupts the normal Lactobacillus population in the vagina, allowing Candida species to proliferate. The first-line treatment for uncomplicated VVC is targeted antifungal medication, most commonly single-dose oral fluconazole.

Step-by-Step Solution

1
Analyze the patient's clinical presentation and recent history.
The patient has intense vaginal itching, thick white discharge, and recent broad-spectrum antibiotic use (amoxicillin-clavulanate).
Recent antibiotic use alters normal vaginal flora (depleting Lactobacillus), heavily predisposing patients to fungal overgrowth.
2
Interpret the physical exam and laboratory findings.
Exam shows erythema and cottage cheese-like discharge. pH is normal (4.0). KOH prep confirms budding yeast and pseudohyphae.
These findings are classic and diagnostic for vulvovaginal candidiasis. Normal vaginal pH (< 4.5) helps differentiate it from bacterial vaginosis and trichomoniasis, which both elevate pH.
3
Select the appropriate targeted pharmacotherapy.
Single-dose oral fluconazole.
Uncomplicated vulvovaginal candidiasis is effectively treated with short-course topical azoles or a single dose of oral fluconazole.

Key Concept

Vulvovaginal candidiasis typically presents with severe vulvar pruritus, thick white discharge, a normal vaginal pH (< 4.5), and pseudohyphae on microscopy; it is often triggered by recent antibiotic use and is treated with an antifungal such as oral fluconazole.
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Gynecologic Infections

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