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Difficulty: MediumGynecologic Infections

A pregnant patient, currently at 10 weeks of gestation, presents to her obstetrician complaining of worsening vaginal discomfort over the past five days. She describes persistent vulvovaginal pruritus and a copious, foul-smelling, yellow-green discharge. She has no abdominal pain, fever, or chills. On pelvic examination, the vulva is edematous and erythematous. The cervix exhibits patchy macular erythema. The vaginal pH is 6.2. Wet mount preparation of the discharge reveals abundant polymorphonuclear leukocytes and motile, flagellated protozoa. Which of the following is the most appropriate next step in management?

  1. Initiate therapy with oral metronidazoleAnswer
  2. B
    Initiate therapy with intravaginal metronidazole
  3. C
    Defer therapy until the second trimester of pregnancy
  4. D
    Initiate therapy with oral azithromycin
  5. E
    Initiate therapy with intravaginal clotrimazole

Answer

The correct answer is to initiate therapy with oral metronidazole.
The correct answer is to initiate therapy with oral metronidazole. The patient's presentation of a frothy, yellow-green discharge, a 'strawberry cervix' (patchy macular erythema), a vaginal pH greater than 4.5, and motile, flagellated organisms on wet mount is strictly diagnostic of Trichomonas vaginalis. Because T. vaginalis infects the Skene and Bartholin glands as well as the urethra, systemic therapy with oral metronidazole is required for a complete cure. Despite historical concerns regarding early pregnancy, oral metronidazole is currently considered safe and is recommended during all trimesters of pregnancy to relieve maternal symptoms and mitigate the risk of premature rupture of membranes and preterm birth.

Step-by-Step Solution

1
Analyze the clinical and microscopic findings.
The patient has a yellow-green discharge, 'strawberry cervix' (patchy macular erythema), pH of 6.2, and motile, flagellated organisms, diagnosing Trichomonas vaginalis.
Accurate identification of the pathogen dictates the necessary pharmacologic intervention.
2
Evaluate the patient's context regarding treatment contraindications.
The patient is in her first trimester (10 weeks gestation).
Pregnancy status can alter first-line drug choices due to teratogenicity concerns.
3
Determine the optimal treatment plan according to current obstetric guidelines.
Systemic treatment with oral metronidazole is indicated.
Oral metronidazole is required to clear glandular reservoirs of the protozoan, and modern evidence confirms it is safe to use throughout all trimesters of pregnancy.

Key Concept

Management of Trichomonas vaginalis in the first trimester of pregnancy
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Topics

Gynecologic Infections

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