Examkin

Question

Difficulty: MediumNeonatal Disorders

An 11-day-old male newborn is brought to the pediatric clinic by his parents due to bilateral eye redness and discharge that began 2 days ago. The infant was born at 39 weeks of gestation via an uncomplicated, unassisted home birth to a 24-year-old mother who recently immigrated and did not receive prenatal care. He has been breastfeeding well and has normal wet diapers. Temperature is 37.1∘C37.1^\circ\text{C} (98.8∘F98.8^\circ\text{F}), pulse is 130/min, and respiratory rate is 40/min. Physical examination reveals bilateral hyperemic and edematous eyelids with a profuse mucopurulent exudate. The corneas appear clear, and there are no vesicles on the surrounding skin. A Gram stain of the conjunctival exudate reveals abundant leukocytes but no organisms. Which of the following is the most appropriate next step in management?

  1. A
    Intravenous cefotaxime
  2. B
    Topical erythromycin
  3. Oral azithromycinAnswer
  4. D
    Intravenous acyclovir
  5. E
    Reassurance and warm compresses

Answer

Oral azithromycin
Oral azithromycin is the correct treatment. The infant's presentation at 11 days of life with mucopurulent conjunctivitis and a Gram stain showing leukocytes but no organisms is highly characteristic of Chlamydia trachomatis. Systemic macrolide therapy (such as oral azithromycin or erythromycin) is required to resolve the conjunctivitis, eradicate nasopharyngeal colonization, and prevent the development of chlamydial pneumonia.

Step-by-Step Solution

1
Identify the clinical presentation and timeline of the neonatal eye infection.
The infant has severe mucopurulent eye discharge beginning at 9 to 11 days of life.
The age of onset is the most critical factor in differentiating the etiologies of neonatal conjunctivitis (chemical is <24 hours, gonococcal is 2-5 days, chlamydial is 5-14 days).
2
Interpret the diagnostic Gram stain findings.
The Gram stain shows abundant leukocytes but no organisms.
Chlamydia trachomatis is an obligate intracellular bacterium that does not stain well with Gram stain, differentiating it from Neisseria gonorrhoeae which would clearly show Gram-negative intracellular diplococci.
3
Determine the appropriate therapeutic intervention.
Systemic therapy with a macrolide, such as oral azithromycin, is selected.
Systemic treatment is strictly necessary to eradicate the nasopharyngeal colonization of Chlamydia, which topical therapy cannot reach, thereby preventing the subsequent development of chlamydial pneumonia.

Key Concept

The diagnosis of neonatal chlamydial conjunctivitis relies on the timeline of presentation (5-14 days) and Gram stain findings (leukocytes without organisms), and it requires systemic macrolide therapy to prevent chlamydial pneumonia.
Estimated Time:1m 15s
Rate this question

Topics

Neonatal Disorders

More questions from this topic