A 19-year-old woman visits the student health clinic reporting four days of dull, aching p… — USMLE Step 2 CK

A 19-year-old woman visits the student health clinic reporting four days of dull, aching pain in her lower abdomen accompanied by new-onset spotting between her menstrual periods. She reports having a new sexual partner over the last month and admits to inconsistent use of barrier contraception. Her vital signs are within normal limits, including a temperature of $37.2^\circ\text{C}$ ( $99.0^\circ\text{F}$ ). She is able to eat and drink without difficulty and does not appear acutely ill. On speculum examination, there is yellow, mucopurulent discharge visible at the cervical os. Bimanual examination demonstrates significant tenderness upon manipulation of the cervix, as well as bilateral adnexal tenderness. Urine pregnancy testing is negative. Which of the following represents the most appropriate initial treatment regimen for this patient?

A
Intravenous cefoxitin and intravenous doxycycline
B
Intramuscular ceftriaxone and a single dose of oral azithromycin
C
Oral levofloxacin and oral metronidazole
Intramuscular ceftriaxone, oral doxycycline, and oral metronidazoleAnswer
E
Intravenous piperacillin-tazobactam

Answer

The correct answer is the combination of intramuscular ceftriaxone, oral doxycycline, and oral metronidazole.

The patient's presentation of lower abdominal pain accompanied by cervical motion tenderness and adnexal tenderness is classic for pelvic inflammatory disease (PID). Because she is not pregnant, is tolerating oral intake without nausea or vomiting, and does not have signs of severe systemic illness or a tubo-ovarian abscess, she meets the criteria for outpatient management. The most appropriate initial treatment is a single dose of intramuscular ceftriaxone (to cover Neisseria gonorrhoeae) combined with a 14-day course of oral doxycycline (to cover Chlamydia trachomatis) and oral metronidazole (to cover anaerobic organisms).

Step-by-Step Solution

Analyze the patient's clinical presentation.

The patient has lower abdominal pain, cervical motion tenderness, and adnexal tenderness, meeting the clinical criteria for pelvic inflammatory disease (PID).

Identifying the disease process is the first step in determining management.

Determine the appropriate level of care (inpatient vs. outpatient).

The patient is afebrile, non-toxic appearing, not pregnant, and tolerating oral intake.

Absence of severe features or indications for hospitalization means outpatient management is appropriate.

Select the guideline-concordant outpatient pharmacotherapy.

The standard CDC outpatient regimen consists of intramuscular ceftriaxone, oral doxycycline, and oral metronidazole.

This specific combination provides necessary coverage for Neisseria gonorrhoeae, Chlamydia trachomatis, and anaerobic vaginal flora.

Key Concept

Outpatient management of uncomplicated Pelvic Inflammatory Disease (PID) requires coverage for N. gonorrhoeae, C. trachomatis, and anaerobes using Ceftriaxone (IM), Doxycycline (PO), and Metronidazole (PO).

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