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Difficulty: EasyPharmacologic Interventions

A 24-year-old pregnant woman presents to the obstetric clinic for her initial prenatal visit at 16 weeks of gestation. She feels well and has no active complaints. Physical examination shows normal vital signs, a gravid uterus appropriate for gestational age, and no mucosal lesions, chancre, or skin rashes. Prenatal screening laboratories show a reactive rapid plasma reagin (RPR) test with a titer of 1:64. Confirmatory testing with Treponema pallidum particle agglutination (TP-PA) is positive. The patient's electronic medical record indicates a history of severe anaphylaxis to amoxicillin during childhood, which was documented with an intensive care unit admission for airway compromise. Which of the following is the most appropriate pharmacologic management for this patient's infection?

  1. Admit for penicillin desensitization followed by intramuscular penicillin G benzathineAnswer
  2. B
    Administer oral doxycycline for 14 days
  3. C
    Administer intravenous ceftriaxone for 14 days
  4. D
    Administer oral azithromycin as a single dose
  5. E
    Administer oral erythromycin for 14 days

Answer

Admit for penicillin desensitization followed by intramuscular penicillin G benzathine.
The correct intervention is to admit the patient for penicillin desensitization followed by administration of intramuscular penicillin G benzathine. Penicillin G is the only recognized and effective treatment to prevent maternal-fetal transmission of Treponema pallidum and treat fetal infection. For pregnant patients who have a confirmed or highly suspected IgE-mediated severe allergy to penicillin (such as anaphylaxis), the standard of care is not to use alternative antibiotics, but rather to perform penicillin desensitization in a monitored clinical setting, followed immediately by standard penicillin therapy.

Step-by-Step Solution

1
Interpret the clinical and laboratory findings.
The patient has asymptomatic latent syphilis, confirmed by positive non-treponemal (RPR) and treponemal (TP-PA) tests.
Accurate diagnosis is required to initiate treatment that protects both the mother and the fetus from congenital syphilis.
2
Determine the standard of care for the diagnosed infection in a pregnant patient.
Penicillin G benzathine is the only recommended medication because it effectively crosses the placenta to treat fetal infection.
Alternative therapies used in non-pregnant adults are either teratogenic or fail to achieve adequate fetal tissue levels.
3
Address the patient's severe penicillin allergy.
The patient must undergo inpatient penicillin desensitization prior to receiving the curative penicillin G dose.
A history of anaphylaxis is an absolute contraindication to standard penicillin administration, but because alternatives are inadequate for congenital syphilis prevention, desensitization is strictly required.

Key Concept

Pregnant patients with syphilis and a severe penicillin allergy must undergo penicillin desensitization to receive penicillin G, as it is the only effective therapy for preventing congenital syphilis.
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Pharmacologic Interventions

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