An obstetric patient at 16 weeks gestation presents to her physician's office for evaluati… — USMLE Step 2 CK

An obstetric patient at $16$ weeks gestation presents to her physician's office for evaluation of increased vaginal discharge that she first noticed a week ago. The $26$ -year-old gravida $2$ , para $1$ , states that the discharge has an unpleasant, "fishy" odor, which becomes more pronounced following intercourse. She has not experienced any vulvar itching, burning with urination, or pelvic pain. Her medical history is unremarkable, and her current pregnancy has been progressing normally. Her temperature is $37.0^\circ\text{C}$ ( $98.6^\circ\text{F}$ ), blood pressure is $110/70 \text{ mm Hg}$ , and pulse is $78/\text{min}$ . On speculum examination, a thin, homogenous, gray-white fluid is seen coating the vaginal walls. The cervix appears normal, and there is no surrounding erythema. Vaginal pH testing yields a value of $5.5$ . The addition of $10\%$ potassium hydroxide to a sample of the vaginal discharge produces a strong amine odor. A wet mount preparation of the discharge shows squamous epithelial cells that are stippled and have indistinct borders due to numerous adherent bacteria. Which of the following is the most appropriate next step in management for this patient?

Prescribe oral metronidazole for the patient onlyAnswer
B
Reassure the patient that this represents a physiologic change of pregnancy
C
Prescribe oral metronidazole for both the patient and her male partner
D
Prescribe intramuscular ceftriaxone and oral azithromycin for the patient
E
Prescribe oral fluconazole for the patient only

Answer

The most appropriate management is to prescribe oral metronidazole for the patient only.

The correct answer identifies that symptomatic bacterial vaginosis in pregnancy should be treated with maternal pharmacotherapy alone (e.g., oral metronidazole). Treatment provides symptom relief, and metronidazole is considered safe throughout all trimesters of pregnancy. Treating male partners of women with bacterial vaginosis provides no clinical benefit and is not recommended by guidelines.

Step-by-Step Solution

Analyze the clinical presentation and physical exam findings.

The patient presents with a malodorous, thin, gray-white discharge with a pH of 5.5, a positive amine whiff test, and clue cells on wet mount.

Accurately identifying these classic signs is required to distinguish the cause of vaginitis.

Formulate a diagnosis based on the Amsel criteria.

The findings meet the clinical diagnostic criteria for bacterial vaginosis (BV).

BV is diagnosed when at least three of the following are present: homogeneous discharge, vaginal pH > 4.5, positive whiff test, and clue cells on microscopy.

Determine the appropriate management plan for a pregnant patient with this condition.

Oral metronidazole or clindamycin is indicated for the patient to relieve her symptoms; partner treatment is unnecessary.

Symptomatic BV in pregnancy requires targeted antibiotic treatment, but studies show treating male partners does not prevent recurrence or improve outcomes.

Key Concept

Diagnosis and management of symptomatic bacterial vaginosis in pregnancy

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