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Difficulty: MediumGynecologic Infections

During a scheduled prenatal visit, a gravid patient at 18 weeks gestation reports experiencing severe vulvovaginal pruritus and a new onset of profuse, malodorous vaginal discharge for the past week. She has no uterine contractions, leakage of fluid, or vaginal bleeding. Her prenatal course has been uncomplicated thus far. On pelvic examination, the vaginal mucosa is erythematous, and a frothy, yellow-green discharge is pooled in the posterior fornix. The cervix appears inflamed with prominent punctate hemorrhages. Vaginal fluid pH testing yields a result of 6.0. Microscopic evaluation of a saline wet preparation reveals numerous polymorphonuclear leukocytes and pear-shaped, motile protozoa. Which of the following is the most appropriate management for this patient?

  1. Prescription for oral metronidazoleAnswer
  2. B
    Prescription for intravaginal metronidazole gel
  3. C
    Reassurance and continuation of routine prenatal care
  4. D
    Prescription for a single dose of oral fluconazole
  5. E
    Administration of intramuscular ceftriaxone and oral azithromycin

Answer

Prescription for oral metronidazole
The patient's clinical presentation—frothy, yellow-green discharge, marked vulvovaginal erythema, and a cervix with punctate hemorrhages (strawberry cervix)—along with a vaginal pH > 4.5 and the presence of motile, flagellated organisms on wet mount, is diagnostic of a Trichomonas vaginalis infection. Symptomatic trichomoniasis during pregnancy must be treated. The treatment of choice is systemic oral metronidazole, which is considered safe for use in all trimesters of pregnancy. Oral administration is absolutely required because T. vaginalis frequently colonizes the urethra and periurethral (Skene) glands. Systemic therapy reaches these reservoirs, whereas topical vaginal therapies do not, resulting in unacceptably high treatment failure rates with topical gels.

Step-by-Step Solution

1
Analyze the clinical presentation and physical exam findings.
The patient presents with frothy, yellow-green discharge, marked vulvovaginal erythema, a 'strawberry cervix' (punctate hemorrhages), and an elevated vaginal pH of 6.0.
These classic clinical findings strongly suggest a Trichomonas vaginalis infection.
2
Interpret the microscopic wet preparation results.
Observation of numerous polymorphonuclear leukocytes and pear-shaped, motile protozoa definitively confirms the diagnosis of trichomoniasis.
Microscopy is a highly specific diagnostic tool for symptomatic vaginal infections when classic motile organisms are visualized.
3
Determine the most appropriate, guideline-concordant treatment for this condition in a pregnant patient.
Systemic treatment with oral metronidazole is indicated.
Oral metronidazole is safe in all trimesters of pregnancy and is mandatory to eradicate the pathogen from periurethral reservoirs, unlike topical treatments which are insufficient.

Key Concept

Diagnosis and management of Trichomonas vaginalis in pregnancy, emphasizing the necessity of systemic (oral) rather than topical therapy to ensure complete pathogen eradication.
Estimated Time:1m 0s
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Topics

Gynecologic Infections

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