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Difficulty: MediumGynecologic Infections

Match the following classic clinical presentations and laboratory findings of lower genital tract infections to their correct diagnosis and corresponding optimal pharmacotherapy.

  • Thin, homogenous, grayish-white discharge; vaginal pH of 5.5; saline wet mount shows squamous epithelial cells with stippled appearances blurring their borders.Bacterial vaginosis; treat with oral metronidazole or topical clindamycin.
  • Thick, curdy, white discharge with intense vulvar erythema and pruritus; vaginal pH of 4.3; potassium hydroxide preparation shows branching, septate structures.Vulvovaginal candidiasis; treat with single-dose oral fluconazole.
  • Frothy, yellow-green, malodorous discharge; vaginal pH of 6.2; saline microscopy reveals actively motile, flagellated organisms slightly larger than polymorphonuclear leukocytes.Trichomoniasis; treat patient and sexual partners with oral metronidazole.
  • Purulent endocervical exudate with spontaneous mucosal bleeding upon swabbing; normal vaginal pH; nucleic acid amplification test confirms an obligate intracellular bacterium.Chlamydial cervicitis; treat with a 7-day course of oral doxycycline.

Answer

Correctly match the clinical presentation and diagnostic findings to the corresponding etiology and guideline-based therapy.
Each pair accurately links the pathognomonic clinical and laboratory features of a specific gynecologic infection with its definitive diagnosis and standard-of-care pharmacotherapy according to current clinical guidelines.

Step-by-Step Solution

1
Evaluate the vaginal pH and character of the discharge for the first presentation.
An elevated pH (5.5) and the presence of clue cells point to bacterial vaginosis.
A vaginal pH >4.5 is seen in bacterial vaginosis and trichomoniasis; clue cells on a wet mount are pathognomonic for bacterial vaginosis.
2
Analyze the microscopic findings on the KOH preparation for the second presentation.
Branching, septate structures (pseudohyphae) with a normal pH indicate vulvovaginal candidiasis.
A normal vaginal pH (3.8-4.5) in the setting of severe pruritus and pseudohyphae effectively rules out bacterial and protozoal etiologies.
3
Identify the flagellated organisms on the wet mount for the third presentation.
Motile protozoa associated with an elevated pH represent Trichomonas vaginalis infection.
Trichomonads can be directly visualized on saline microscopy; because it is highly contagious, concurrent partner treatment is mandatory to prevent reinfection.
4
Assess the cervical signs and NAAT results for the fourth presentation.
Cervical friability with an obligate intracellular organism on NAAT confirms chlamydial cervicitis.
Unlike vaginitis, cervicitis does not typically alter vaginal pH and requires targeted antibiotic therapy (e.g., a 7-day course of oral doxycycline) based on the specific pathogen.

Key Concept

Differentiation of lower genital tract infections relies on specific discharge characteristics, vaginal pH levels, microscopic findings (clue cells, pseudohyphae, motile trichomonads), and targeted antimicrobial management.
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Topics

Gynecologic Infections

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