Surgical site infections (SSIs) remain one of the most significant — and preventable — complications in modern surgery. A 2015 survey by the Centers for Disease Control and Prevention found that there were an estimated 110,800 surgical site infections from inpatient surgeries alone in the United States that year. The costs extend far beyond statistics: SSIs rank among the most expensive healthcare-acquired conditions, with consequences including prolonged hospitalization, disability, and death.
The Scale of the Problem
Surgical site infections are associated with:
- A 2 to 11-fold increased mortality risk compared to patients without SSIs
- 75% of infection-related surgical deaths directly attributable to these infections
- Substantially prolonged hospital stays
- Significant additional healthcare costs, including reoperation, extended antibiotic courses, and readmissions
Given this burden, it is far preferable to prevent surgical site infections altogether rather than manage them after they occur.
Types of Surgical Site Infections
The CDC recognizes three categories of SSI, defined by depth and location of involvement:
- Superficial incisional SSI: Involving only the skin and subcutaneous tissue at the incision site
- Deep incisional SSI: Involving the deep soft tissues (fascia and muscle layers) of the incision
- Organ/space SSI: Involving any organ or space opened or manipulated during the surgical procedure (e.g., abdominal cavity, joint space)
Common symptoms include redness and warmth at the wound site, fever, localized pain, swelling, and purulent discharge. Organ/space infections may present with more systemic signs including sepsis.
Evidence-Based Prevention Strategies
The evidence base for SSI prevention is substantial, and adherence to proven protocols significantly reduces infection rates:
Skin Preparation
Preoperative skin preparation using chlorhexidine gluconate with alcohol-based agents is more effective than povidone-iodine alone in reducing SSI rates. Shaving the surgical site with razors should be avoided — if hair removal is necessary, clippers are preferred, as razors create microscopic skin nicks that become bacterial entry points.
Normothermia Maintenance
Maintaining the patient's normal body temperature during surgery is strongly associated with reduced SSI risk. Perioperative hypothermia impairs immune function and reduces tissue oxygen delivery, creating conditions that favor bacterial growth at wound sites. Warming blankets, warmed IV fluids, and warmed insufflation gases contribute to normothermia maintenance.
Glycemic Control
Hyperglycemia impairs neutrophil function and wound healing. Perioperative glucose control — targeting blood glucose levels below 180 mg/dL in all patients (not only diabetics) — reduces SSI risk. Diabetic patients require particular attention.
Prophylactic Antibiotics
Appropriate antibiotic prophylaxis, administered within 60 minutes before incision and discontinued within 24 hours post-operatively in most cases, is one of the most evidence-based interventions for SSI prevention. Agent selection should be matched to the expected bacterial flora for the specific procedure.
Negative Pressure Wound Therapy
In high-risk patients (obese, diabetic, or those undergoing complex procedures), prophylactic negative pressure wound therapy applied at the time of closure has demonstrated SSI reduction in randomized trials.
The Role of Ongoing Research
Despite established prevention protocols, SSIs continue to occur, motivating ongoing research into novel strategies including:
- Enhanced wound closure techniques and materials
- Topical antimicrobial agents applied at closure
- Optimization of antibiotic prophylaxis timing and dosing
- Perioperative immunomodulation strategies
Implementing current evidence while continuing to advance the science of prevention is the joint responsibility of surgeons, anesthesiologists, infection control specialists, and hospital administration — a team sport in the truest sense.