Introduction: 

This case represents an opportunity to investigate and manage severe lower abdominal pain in a sexually active young female, integrating factors such as sexual history, physical findings, lab results, and management options. This case aims to approach reproductive health issues by promoting an understanding of diagnosis, management, and prevention strategies in the context of sexually transmitted infections.

Case Profile: 

Ms. Johnson, an 18-year-old G1P1 female, LMP two weeks ago, visits your clinic with a two-week history of severe lower abdominal pain. The pain is constant, bilateral, and associated with fever and chills. She reports occasional nausea and several instances of vomiting. She's been sexually active for four years and has had unprotected intercourse with multiple partners. She denies irregular bleeding, dysmenorrhea, or dyspareunia. She has no significant past medical history, but her surgical history includes a routine adenoidectomy in childhood and a complication-free vaginal delivery two years ago.

On physical examination, she appears ill with a temperature of 99°F (37.2°C), a pulse of 92 bpm, a BP of 120/80, and a respiratory rate of 20 breaths/minute. Her abdomen shows palpable tenderness in the lower quadrants, slight distension, and rebound tenderness but negative psoas and Murphy’s signs. On genital examination, Bartholins, Urethral, and Skene’s glands appear normal, and the vagina is pink and moist. There's a purulent discharge from the cervical os, and the cervix appears indurated. The uterus is tender to palpation and occupies a midline position, with bilateral adnexal fullness and moderate tenderness.

Laboratory findings show positive GC, negative RPR, and a WBC of 18.6 with a left shift, and urinalysis shows a few WBCs, no bacteria, no leukocyte esterase, no nitrites, 2+ ketones, and a negative urine HCG.

Activity Questions:

• What is your differential diagnosis for acute lower abdominal pain in a sexually active female? 
  Hint: Think of possible gynecologic and non-gynecologic causes, including sexually transmitted infections and other abdominal conditions.
  

• What is the most likely diagnosis in this case? 
  Hint: Consider her sexual history, symptoms, and examination findings.
  

• Which organisms are most likely to cause this condition? 
  Hint: Think about sexually transmitted pathogens and their association with her symptoms.
  

• What are common presenting signs and symptoms of this condition? 
  Hint: Reflect on the typical clinical features of acute PID.
  

• What is the definitive diagnostic tool for cases where the diagnosis is unclear? 
  Hint: Think about the role of laparoscopy in diagnosing PID.
  

• What criteria would you use to determine whether this patient should be treated as an inpatient or outpatient for PID? 
  Hint: Think about the severity of symptoms, patient compliance, and potential complications.
  

• What is your management plan and plan for follow-up? 
  Hint: Consider both empiric treatment for PID and the need for follow-up to ensure treatment success.
  

• If this condition were left untreated, what complications might arise? 
  Hint: Consider both the immediate and long-term complications of untreated PID.
  

• How can a diagnosis of UTI be ruled out in this patient? 
  Hint: Think about the specific urinary symptoms and urinalysis findings associated with a UTI.
  

• What are some STI prevention strategies? 
  Hint: Consider behavioral, barrier, immunization, and partner notification strategies.
  

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