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Difficulty: EasyPharmacologic Interventions

A 2626-year-old woman, who is 99 weeks pregnant, is evaluated in the emergency department for a 2424-hour history of right-sided flank pain, fever, and severe nausea with vomiting. Her temperature is 38.9∘C38.9^{\circ}\text{C} (102.0∘F102.0^{\circ}\text{F}), blood pressure is 110/70 mmHg110/70\text{ mmHg}, and heart rate is 112/min112/\text{min}. Physical examination reveals marked right-sided costovertebral angle tenderness. She is currently unable to tolerate any oral intake. Laboratory evaluation shows a leukocyte count of 16,000/mm316,000/\text{mm}^3 with a left shift. Urinalysis is positive for leukocyte esterase, nitrites, and >50>50 white blood cells per high-power field. Which of the following is the most appropriate initial pharmacologic intervention?

  1. Intravenous ceftriaxoneAnswer
  2. B
    Intravenous ciprofloxacin
  3. C
    Intravenous ampicillin
  4. D
    Intravenous doxycycline
  5. E
    Oral nitrofurantoin

Answer

The most appropriate initial therapy is intravenous ceftriaxone.
The correct intervention is intravenous ceftriaxone. This patient presents with acute pyelonephritis, complicated by pregnancy and intractable vomiting. She requires inpatient admission and intravenous antibiotics. Third-generation cephalosporins (such as ceftriaxone or cefotaxime) or a combination of ampicillin and gentamicin are the standard of care for empiric therapy. Ceftriaxone effectively targets the most common causative organism, Escherichia coli, achieves excellent concentrations in the renal parenchyma, and is categorized as safe during pregnancy.

Step-by-Step Solution

1
Diagnose the patient based on clinical presentation and lab findings.
The patient has acute pyelonephritis (fever, flank pain, costovertebral angle tenderness, pyuria) and is in her first trimester of pregnancy.
Establishing the severity and location of the urinary tract infection determines the required pharmacokinetics of the treatment, while pregnancy status limits the pool of safe drugs.
2
Determine the optimal route of administration.
The patient requires intravenous antibiotics.
She has systemic symptoms, severe nausea, and active vomiting, making oral administration unreliable and inappropriate for initial stabilization.
3
Select the most appropriate antibiotic that is safe for the fetus, achieves high tissue concentration in the kidneys, and covers typical uropathogens.
Intravenous ceftriaxone is selected over alternatives.
Beta-lactams (including third-generation cephalosporins) are generally safe in pregnancy and provide excellent coverage for E. coli. Fluoroquinolones and tetracyclines must be strictly avoided due to teratogenicity.

Key Concept

Empiric treatment for acute pyelonephritis in a pregnant patient requires an intravenous antibiotic (e.g., ceftriaxone) that achieves adequate renal tissue concentrations, covers typical Gram-negative uropathogens, and avoids fetal teratogenicity (avoiding fluoroquinolones and tetracyclines).
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Pharmacologic Interventions

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