Pelvic Inflammatory Disease

1. Epidemiology
   1. Incidence: 750,000 cases per year in United States
   2. Age: Peaks between ages 15 to 29 years
2. Pathophysiology
   1. Intra-abdominal spread
      1. Cervix to endometrium and via salpinx to peritoneal cavity
   2. Lymphatic spread
      1. Example: IUD related infection
   3. Hematogenous spread (rare)
      1. Example: Tuberculosis
3. Etiology
   1. Chlamydia trachomatis
   2. NeisseriaGonorrhea
   3. Mycoplasma hominis
   4. Mycoplasma genitalium (associated with treatment failures, not currently covered by antibiotic regimens)
   5. Facultative or anaerobic organisms
4. Risk Factors
   1. Sexually Transmitted Disease (STD) history
      1. Chlamydia is asymptomatic in 80-90% of women
      2. Gonorrhea is asymptomatic in 10% of women
      3. Untreated Chlamydia or Gonorrhea is associated with a 10-20% risk of PID
   2. Age younger than 25 years
   3. Onset sexual intercourse at a young age (younger than 15 years old)
   4. Prior history of Pelvic Inflammatory Disease
   5. High number of sexual partners
   6. Non-barrier Contraception (e.g. IUD, Oral Contraceptives)
5. Symptoms: Onset usually in first half of Menstrual Cycle
   1. Abdominal Pain or Pelvic Pain or cramping (varying intensity)
   2. Vaginal Discharge (new or abnormal)
   3. Fever or chills (fever may be high grade)
   4. Dyspareunia
   5. Dysuria
   6. Heavy or prolonged Menses or post-coital bleeding
6. Exam
   1. Bimanual exam and speculum exam in all suspected cases
      1. Cervical motion tenderness
      2. Uterine tenderness
      3. Adnexal tenderness
   2. See Diagnosis below for signs
   3. Clinical diagnosis alone is accurate (when compared with imaging and laparoscopy)
      1. Test Sensitivity: 87%
      2. Test Specificity: 50%
      3. Positive Predictive Value: 65-90%
7. Diagnosis: 2002 CDC Criteria
   1. Major Criteria (Required)
      1. Uterine or Adnexal tenderness to palpation or
      2. Cervical motion tenderness
      3. No other apparent cause
   2. Minor Criteria (Supporting, but not required)
      1. Fever >101 F (38.3 C)
      2. Abnormal discharge per Cervix or vagina
      3. WBCs on Gram Stain or Saline of Cervix swab
      4. Gonorrhea or Chlamydia testing positive
      5. Increased Erythrocyte Sedimentation Rate or C-Reactive Protein
      6. PID findings on diagnostic study (see below)
   3. Most specific findings (not required and rarely indicated unless refractory to management or unclear diagnosis)
      1. Laparoscopy findings consistent with PID
      2. Endometrial Biopsy with histology suggestive of Endometritis
      3. Imaging (Transvaginal Ultrasound or MRI) with classic findings
         1. Thickened, fluid filled tubes
         2. Free pelvic fluid may be present
         3. Tubo-ovarian complex
         4. Tubal hyperemia on doppler Ultrasound
8. Differential Diagnosis
   1. See Acute Pelvic Pain
   2. See Acute Pelvic Pain Causes
   3. Ruptured Ovarian Cyst
      1. Sudden onset of mid-cycle pain
   4. Ectopic Pregnancy
      1. Unilateral pain
      2. Positive Pregnancy Test
      3. Afebrile
      4. White Blood Cell Count normal
   5. Appendicitis
      1. Right Lower Quadrant Abdominal Pain
      2. More bowel Symptoms
   6. Urinary Tract Infection (including Pyelonephritis)
      1. No Cervical Motion Tenderness or Vaginal Discharge
   7. Ovarian Torsion
      1. More localized pain
      2. Sudden onset
      3. Afebrile
      4. White Blood Cell Count normal
   8. Other common causes
      1. Nephrolithiasis
      2. Inflammatory Bowel Disease
9. Labs
   1. General
      1. Do not delay treatment while waiting for labs
   2. Inflammatory markers (if all normal, PID is very unlikely)
      1. Complete Blood Count (CBC)
      2. Erythrocyte Sedimentation Rate or C-Reactive Protein
      3. Vaginal secretion exam (saline wet prep)
         1. Vaginal PMNs (Negative Predictive Value 95%)
         2. Identifies Trichomonas vaginalis and Bacterial Vaginosis
   3. Sexually Transmitted Disease screening
      1. DNA probe PCR for Gonorrhea and Chlamydia
         1. Cervical specimen recommended over urine specimen
         2. Test Sensitivity and Test Specificity are high
      2. Rapid Plasma Reagin (RPR)
      3. Human Immunodeficiency Virus Test (HIV Test)
   4. Other initial labs
      1. Urine Pregnancy Test
      2. Blood Cultures
10. Diagnostics
    1. Endometrial Biopsy: Endometritis
       1. Test Sensitivity: 74%
       2. Test Specificity: 84%
    2. Transvaginal pelvic Ultrasound
       1. Efficacy
          1. Test Sensitivity: 30%
          2. Test Specificity: 76%
       2. Pelvic free fluid in cul-de-sac
       3. Tubo-ovarian abscess may be present
       4. Doppler demonstrates tubal hyperemia
       5. Fallopian tube changes
          1. Thickened fallopian tube wall >5 mm
          2. Fluid filled fallopian tubes
          3. Incomplete septae in fallopian tube
             1. Cogwheel sign on tube cross-section view
    3. CT Pelvis
       1. Other imaging modalities are preferred for PID evaluation
       2. Pelvic floor fascial, Adnexal inflammation
       3. Uterosacral ligament thickening
       4. Pelvic free fluid
    4. MRI Pelvis
       1. Efficacy
          1. Test Sensitivity: 81-95%
          2. Test Specificity: 89-100%
       2. Tubo-ovarian abscess may be present
       3. Pelvic free fluid
       4. Fallopian tube changes
          1. Fluid filled fallopian tubes
          2. Ovaries have polycystic appearance
       5. References
          1. Tukeva (1999) Radiology 210:209-16 [PubMed]
    5. Laparoscopy
       1. Indicated for unclear diagnosis
       2. Pelvic Inflammatory Disease misdiagnosed 25% time
11. Management: General
    1. Intrauterine Device (IUD) removal is controversial
       1. IUD increases PID for only first 3 weeks following insertion
          1. Risks are similar between the Copper-T IUD and the Mirena IUD
       2. Historically, IUD has been removed at time of PID diagnosis
       3. No evidence supports removal of IUD in PID
       4. Close follow-up is critical for those who developed PID with IUD in place
    2. Treat patient's sexual contacts within last 60 days
       1. Abstain from sexual intercourse until patient and partner have completed treatment
    3. Start empiric therapy if minimal criteria present
       1. Do not delay treatment
       2. Delay >3 days increases ectopic and Infertility risk
    4. Antibiotic should cover Gonorrhea and Chlamydia
12. Management: Special Populations
    1. HIV positive women
       1. May be treated with same antibiotics and guidelines as non-HIV patients
       2. More likely to be infected with Mycoplasma or Streptococcus than with Gonorrhea or Chlamydia
    2. Pregnant women
       1. PID is less common in pregnancy, but can occur in first trimester before formation of mucous plug
       2. Pregnant women with PID have greater risk of complications including Preterm Labor
       3. Admit and initiate parenteral antibiotics for initial PID treatment in pregnancy
13. Management Outpatient
    1. Step 1: Initial Treatment at Diagnosis (with step 2)
       1. Cefoxitin 2g IM and Probenecid 1g PO or
       2. Ceftriaxone 250 mg IM for 1 dose or
       3. Other third generation Cephalosporin (e.g Cefotaxime, Ceftizoxime)
    2. Step 2: Outpatient 14 day antibiotic course
       1. Select general antibiotic coverage
          1. Doxycycline 100 mg PO bid for 14 days (75% cure, preferred agent) or
          2. Azithromycin 1 gram orally once weekly for 2 weeks (alternative option, not CDC guideline)
             1. Savaris (2007) Obstet Gynecol 110:53–60 [PubMed]
       2. Consider adding anaerobic coverage
          1. Metronidazole 500 mg orally twice daily for 14 days or
          2. Clindamycin 450 mg PO four times daily for 14 days
       3. Agents to avoid
          1. Fluoroquinolones (e.g. Ofloxacin 400 bid or Levofloxacin 500 daily) are no longer recommended
          2. Cohorts at highest risk for Fluoroquinolone resistance
             1. Homosexual men and any female sexual contacts
             2. Endemic areas
                1. Asia: China, Japan, Korea, Philippines, Vietnam
                2. Other: England, Wales, Australia
                3. US: California
    3. References
       1. Workowski (2010) MMWR Recomm Rep 59(RR-12): 1-110 [PubMed]
14. Management Inpatient
    1. Hospitalization Indications
       1. Severe illness
          1. Toxic appearance
          2. High fever
       2. Unable to take oral fluids or oral medications
       3. Unclear diagnosis
          1. Appendicitis
          2. Ectopic Pregnancy
          3. Ovarian Torsion
       4. Pelvic abscess (tubo-ovarian abscess)
          1. Requires at least 24 hours of parenteral therapy inpatient
       5. Pregnancy
       6. HIV positive
       7. Adolescents
       8. Outpatient treatment failure
       9. Unreliable patient
    2. Inpatient treatment Regimens
       1. General
          1. Treat for at least 48 hours IV
       2. Regimen A (preferred)
          1. Cefoxitin 2g IV q6h OR Cefotetan 2g IV q12h and
          2. Doxycycline 100 mg PO or IV q12h
       3. Regimen B
          1. Clindamycin 900 mg IV q8h and
          2. Gentamicin 2 mg/kg IV load, then 1.5 mg/kg IV q8h
             1. Alternative: Conversion to single daily dosing (at 3-5 mg/kg)
       4. Alternative
          1. Unasyn 3g IV q6 hours and
          2. Doxycycline 100 mg PO or IV q12 hours
       5. Other options that are not recommended (listed for historical reasons)
          1. Regimen C
             1. Ofloxacin 400 mg IV q12h or Levoquin 500 IV qd and
             2. Consider adding Metronidazole 500 IV q8 hours
       6. Discharge Regimen (after IV antibiotics above)
          1. See Outpatient Management Step 2 above
          2. Discontinue 24 hours after clinical improvement and complete therapy with oral antibiotics
             1. Doxycycline 100 mg orally twice daily for 14 days or
             2. Clindamycin 450 mg PO qid for 14 days
    3. References
       1. Workowski (2010) MMWR Recomm Rep 59(RR-12): 1-110 [PubMed]
15. Course
    1. Expect clinical symptom improvement within first 72 hours of treatment
    2. Lack of improvement after 72 hours requires additional evaluation
       1. Consider inpatient parenteral therapy
       2. Broaden antibiotic coverage
       3. Consider Ultrasound to assess for tubo-ovarian abscess
16. Prevention
    1. Screen all sexually active women age <25 years for Chlamydia
    2. Re-screen for STD 6 months after PID episode (Gonorrhea and Chlamydia)
    3. Encourage barrier Contraception (Condom use)
17. Complications
    1. Infertility associated with tubal scarring (20%)
    2. Chronic Pelvic Pain (18%)
    3. Tubal Pregnancy (9%)
18. References
    1. (2002) MMWR Recomm Rep 51(RR-6):1-78 [PubMed]
    2. Crossman (2006) Am Fam Physician 73(5):859-64 [PubMed]
    3. Gradison (2012) Am Fam Physician 85(8): 791-6 [PubMed]
    4. Miller (2003) Am Fam Physician 67(9):1915-22 [PubMed]
    5. Workowski (2010) MMWR Recomm Rep 59(RR-12): 1-110 [PubMed]