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Zorluk: KolayPharmacologic Interventions

A 26-year-old woman, G2P1, at 16 weeks gestation presents to the clinic for a routine prenatal visit. She recently underwent standard prenatal screening. Her laboratory results show a positive rapid plasma reagin (RPR) test with a titer of 1:32, and a positive fluorescent treponemal antibody absorption (FTA-ABS) test. The patient feels well and has no history of genital ulcers, rashes, or neurologic symptoms. When discussing the treatment plan, she states that she had a severe allergic reaction to penicillin at age 10, which was characterized by widespread hives, facial swelling, and difficulty breathing. Vital signs are within normal limits, and the physical examination is unremarkable. Which of the following is the most appropriate next step in the pharmacologic management of this patient?

  1. Admit for penicillin desensitization followed by intramuscular penicillin G benzathineCevap
  2. B
    Prescribe a 14-day course of oral doxycycline
  3. C
    Administer a single dose of intramuscular ceftriaxone
  4. D
    Prescribe a 14-day course of oral erythromycin
  5. E
    Prescribe a single dose of oral azithromycin

Cevap

Admit for penicillin desensitization followed by intramuscular penicillin G benzathine
The correct approach is to admit the patient for penicillin desensitization followed by intramuscular penicillin G benzathine. Penicillin is the only antibiotic with proven efficacy for treating maternal syphilis while simultaneously crossing the placenta to treat or prevent congenital syphilis. Alternative therapies (such as macrolides) do not cross the placenta reliably, and others (such as tetracyclines) are strictly contraindicated in pregnancy due to teratogenicity. Because this patient has a history of a severe, IgE-mediated allergic reaction (hives, facial swelling, difficulty breathing), she must undergo inpatient desensitization to safely receive the necessary penicillin therapy.

Adım Adım Çözüm

1
Diagnose the patient's condition based on laboratory results.
The patient has latent syphilis in pregnancy, confirmed by positive nontreponemal (RPR) and treponemal (FTA-ABS) tests without clinical symptoms.
Accurate diagnosis is required to determine the necessary pharmacologic intervention and treatment goals (treating the mother and preventing congenital syphilis).
2
Identify the standard of care for the diagnosed condition.
The only established, highly effective regimen for preventing congenital syphilis is maternal treatment with intramuscular penicillin G benzathine.
Alternative agents either do not cross the placenta adequately (macrolides), are teratogenic (tetracyclines), or lack sufficient evidence for fetal protection.
3
Reconcile the standard of care with the patient's medical history.
The patient has a history of an IgE-mediated anaphylactic reaction to penicillin (hives, facial swelling, dyspnea).
Direct administration of penicillin could trigger life-threatening anaphylaxis, and cross-reactivity limits the use of other beta-lactams like cephalosporins.
4
Determine the appropriate intervention for a pregnant patient with syphilis and a severe penicillin allergy.
The patient must be admitted for penicillin desensitization, followed by the standard intramuscular administration of penicillin G benzathine.
Because penicillin is the only accepted treatment to prevent congenital syphilis, desensitization is mandatory when an absolute allergy is present.

Anahtar Kavram

Pregnant patients with syphilis who have a reported severe, IgE-mediated penicillin allergy must undergo penicillin desensitization followed by treatment with penicillin G benzathine to ensure adequate treatment of the fetus.
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Pharmacologic Interventions

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