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Puerperal sepsis definition causes clinical features management

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Puerperal Sepsis

Definition

Puerperal sepsis is infection of the genital tract occurring within 42 days of delivery or abortion. The WHO defines it as fever of 38.5°C (101.3°F) or higher occurring on any 2 of the first 10 days postpartum, exclusive of the first 24 hours. Park's Textbook of Preventive Medicine defines it more broadly as infection of the genital tract within 3 weeks after delivery, accompanied by rise in temperature and pulse rate, foul-smelling lochia, and lower abdominal pain.
  • Affects approximately 5% of vaginal deliveries and 10% of cesarean sections
  • Responsible for up to 15% of maternal deaths worldwide
  • Incidence of Group A Streptococcal puerperal sepsis: ~6-80 cases per 100,000 live births; case-fatality rate ~3.5%

Causative Organisms

Puerperal sepsis is essentially a polymicrobial infection arising from ascent of normal vaginal flora into the upper genital tract.
Common pathogens:
CategoryOrganisms
Gram-positive cocci (aerobic)Group B Streptococcus (GBS), Group A Streptococcus (S. pyogenes), Staphylococcus aureus
Gram-negative enteric bacilliE. coli, Klebsiella pneumoniae, Proteus species
Anaerobic gram-positiveStreptococcus species, Peptostreptococcus species
Anaerobic gram-negativeBacteroides species, Prevotella species
AtypicalChlamydia trachomatis (late-onset), Mycoplasma hominis, Ureaplasma urealyticum
  • S. pyogenes (Group A Strep) is notable for being particularly virulent - can cause rapid systemic sepsis and toxic shock syndrome
  • GBS colonization is a major predisposing factor
  • C. trachomatis is implicated in late-onset (>7 days) rather than early puerperal endometritis

Risk Factors / Predisposing Factors

  • Cesarean section (highest risk)
  • Prolonged rupture of membranes (PROM)
  • Prolonged/extended labor
  • Multiple vaginal examinations during labor
  • Internal monitoring in labor (intrauterine pressure catheters, fetal scalp electrodes)
  • Operative delivery (forceps, vacuum)
  • Chorioamnionitis (intra-amniotic infection)
  • Preexisting lower genital tract infection (gonorrhea, GBS colonization, bacterial vaginosis)
  • Young maternal age
  • Lack of prenatal care
  • Low socioeconomic status

Clinical Features

The most common form is endometritis (infection of the uterine endometrium), developing on the 2nd or 3rd day postpartum.
Cardinal features:
  • Fever - 38°C or higher within 36 hours of delivery; often the first sign
  • Lower abdominal pain and tenderness
  • Uterine tenderness on bimanual examination
  • Malodorous (foul-smelling) lochia
  • Tachycardia and malaise
Additional features depending on severity:
  • Leukocytosis (elevated WBC count)
  • Tender inflammatory mass in the broad ligament, posterior cul-de-sac, or retrovesical space (suggests pelvic abscess)
S. pyogenes sepsis specifically may present with fever, abdominal pain, and hypotension without the expected tachycardia or leukocytosis - an important atypical presentation. Maternal mortality is highest when infection occurs within 4 days of delivery.

Differential Diagnosis of Postpartum Fever

  • Perineal/wound infection
  • Urinary tract infection / pyelonephritis
  • Atelectasis (within 24 hours)
  • Septic pelvic thrombophlebitis
  • Deep venous thrombosis
  • Breast engorgement / mastitis
  • Pelvic abscess
  • Pneumonia, appendicitis (if no puerperal cause found)

Investigations

  • Full blood count - leukocytosis, left shift
  • Blood cultures - indicated in patients with severe infection or who fail to improve
  • High vaginal swab / cervical swab - for culture and sensitivity
  • Urinalysis and urine culture - to exclude UTI
  • Pelvic/abdominal ultrasound - to exclude retained products of conception, pelvic abscess
  • Chest X-ray - in selected patients

Management

1. Antibiotic Therapy (mainstay)

Treatment is empirical and broad-spectrum, targeting gram-positive cocci, gram-negative enterics, and anaerobes.
First-line regimen:
Clindamycin 900 mg IV every 8 hours + Gentamicin 5 mg/kg IV every 24 hours
This combination has documented efficacy in multiple trials totaling over 4,000 participants and covers the majority of pelvic pathogens.
Modifications and alternatives:
  • If known GBS colonization with clindamycin resistance or unknown susceptibility: add Ampicillin 2 g IV every 6 hours
  • If concern for Enterococcus (treatment failure with above): add Ampicillin 2 g IV every 6 hours or Penicillin 5 million units IV every 6 hours
  • Ampicillin-sulbactam 3 g IV every 6 hours - reasonable alternative with less anaerobic resistance
  • Broad-spectrum single agents (usually reserved for treatment failures or special circumstances):
    • Piperacillin-tazobactam 3.375 g IV every 6 hours
    • Cefotetan 2 g IV every 12 hours
    • Ticarcillin-clavulanic acid 3.1 g IV every 6 hours
    • Imipenem-cilastatin 500 mg IV every 6 hours
    • Meropenem 1 g IV every 8 hours
    • Ertapenem 1 g IV every 24 hours
  • For wound infection with MRSA concern: add Vancomycin 1 g IV every 12 hours

2. Response to Treatment

  • ~90-95% of patients defervesce within 48-72 hours of starting IV antibiotics
  • Once afebrile and asymptomatic for ~24 hours, IV antibiotics can be stopped and patient discharged
  • Routine oral antibiotics after discharge are not necessary in most cases

3. Treatment Failure - Look For:

CauseAction
Resistant organism (Enterococcus)Add ampicillin/penicillin
Wound infection/abscessOpen wound, drain; add antistaphylococcal coverage
Pelvic abscessSurgical drainage
Septic pelvic vein thrombophlebitisAdd heparin anticoagulation
Drug reactionEosinophilia; stop offending drug
Retained products of conceptionEvacuation/curettage

4. Supportive Measures

  • IV fluid resuscitation
  • Analgesia
  • Thromboprophylaxis (heparin)
  • Monitoring (vital signs, urine output)
  • ICU admission for severe sepsis/septic shock

5. Surgical Management (if needed)

  • Drainage of pelvic abscess
  • Evacuation of retained products of conception (surgical or medical)
  • In extreme cases of fulminant, refractory sepsis: hysterectomy (emergency)

Prevention

  • Strict asepsis before, during, and after delivery
  • Prophylactic antibiotics before cesarean section (single dose of cefazolin)
  • Minimize number of vaginal examinations during labor
  • Intrapartum GBS prophylaxis in colonized women
  • Avoid unnecessary operative deliveries
  • Adequate prenatal care and nutritional support
  • Early recognition and treatment of chorioamnionitis
Sources:
  • Creasy & Resnik's Maternal-Fetal Medicine, Chapter: Puerperal Endometritis
  • Rosen's Emergency Medicine: Postpartum Endometritis
  • Goldman-Cecil Medicine: Puerperal Sepsis (S. pyogenes)
  • Park's Textbook of Preventive and Social Medicine: Complications of the Postpartal Period
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