Focused History and Physical Examination for Recurrent Surgical Site Infection
For patients with recurrent surgical site infections, your history and physical examination must systematically identify predisposing conditions and assess for systemic involvement to guide management and prevent progression to sepsis.
History of Present Illness
Timing and Pattern of Recurrence
- Document the exact number of episodes per year (≥3-4 episodes annually indicates need for prophylactic antibiotics) 1
- Timing of current infection relative to surgery (SSIs rarely occur in first 48 hours; most present 2-4 weeks to 3 months post-operatively) 1, 2
- Pattern of symptoms: back pain is the most common presenting symptom in spine surgery SSIs 2
Wound Characteristics
- Presence of purulent drainage (diagnostic criterion) 1
- Local symptoms: pain, tenderness, swelling, erythema 1
- Wound dehiscence or spontaneous opening
Systemic Signs (Critical for Treatment Decisions)
- Fever >38.5°C
- Heart rate >110 beats/minute
- Document these specifically as they determine need for systemic antibiotics 1
Surgical Details
- Type and location of original surgery (axilla, GI tract, perineum, or female genital tract require gram-negative and anaerobic coverage) 1
- Presence of prosthetic material (mandates 1-year surveillance vs 30 days without) 1
- Clean vs contaminated operation classification 1
Predisposing Conditions Assessment (Strong Evidence)
The IDSA guidelines strongly recommend identifying and treating these specific conditions 1:
Vascular/Lymphatic
- Edema (any location)
- Venous insufficiency (check for varicosities, skin changes)
- Lymphedema (particularly post-breast cancer treatment)
Dermatologic
- Toe web abnormalities (interdigital maceration, tinea pedis)
- Eczema or other chronic skin conditions
Metabolic
- Obesity (document BMI as it's an independent risk factor) 3
- Diabetes mellitus and glycemic control status 3, 4
Other Risk Factors
MRSA Risk Stratification (Guides Antibiotic Choice)
Document presence of 1:
- Prior MRSA infection or nasal colonization
- Recent hospitalization
- Recent antibiotic use
Physical Examination
Wound Assessment
- Measure erythema and induration extent (>5 cm from wound edge indicates need for systemic antibiotics) 1
- Assess for purulent drainage
- Palpate for fluctuance or fluid collection
- Check if sutures are still present (removal indicated) 1
Depth Classification
Determine if infection is 1:
- Superficial incisional (subcutaneous only, within 30 days)
- Deep incisional (involves fascia/muscle)
- Organ/space (deeper structures)
Vital Signs
- Temperature (document if >38.5°C)
- Heart rate (document if >110 bpm)
- Blood pressure for hemodynamic stability 2
Predisposing Condition Examination
- Lower extremity edema assessment
- Venous insufficiency signs (stasis dermatitis, varicosities)
- Toe web spaces for maceration or fungal infection
- Skin integrity around wound and dependent areas
Laboratory Considerations
While not strictly "history and physical," obtain:
- WBC count (>12,000/µL indicates systemic response requiring antibiotics) 1
- Inflammatory markers (compare pre-op to post-op levels; serum amyloid A may expedite diagnosis) 2
- Blood cultures before antibiotics if systemically ill 2
Critical Pitfalls to Avoid
- Don't dismiss early post-operative fever (<48 hours) without wound inspection, as S. pyogenes or Clostridium can present this early 1
- Don't start antibiotics before obtaining cultures unless patient is hemodynamically compromised 2
- Don't overlook the 2-4 week post-operative window when scheduling follow-up for high-risk patients 2
- Maintain high index of suspicion in emergency surgery patients with physiologic derangement 5