Surgical site infection (SSI) is defined as infection occurring within 30 days after a surgical procedure involving skin, subcutaneous tissue, deep soft tissue, or organ space¹. SSIs account for nearly 20% of healthcare-associated infections globally and significantly contribute to prolonged hospital stay, increased healthcare costs, and patient morbidity². Despite advancements in antiseptic protocols, antimicrobial prophylaxis, and surgical techniques, SSI remains a persistent challenge in abdominal surgeries³.

Laparotomy, a surgical incision into the abdominal cavity, is commonly performed for various conditions such as gastrointestinal obstruction, malignancies, perforation peritonitis, trauma, and inflammatory diseases⁴. The risk of SSI in laparotomy is influenced by several factors including wound contamination level, duration of surgery, patient comorbidities, nutritional status, and emergency nature of the procedure⁵.

Elective laparotomies are performed under controlled conditions after adequate preoperative optimization of patients. Proper bowel preparation, prophylactic antibiotics, glycemic control, and sterile surgical environments contribute to lower infection rates⁶. In contrast, emergency laparotomies are often conducted in patients with hemodynamic instability, sepsis, bowel perforation, or trauma, where contamination risk is significantly higher⁷.

The World Health Organization reports that SSI incidence ranges from 1–10% in developed countries but may reach 30% in low- and middle-income countries⁸. Studies have consistently demonstrated that emergency surgeries carry a 2–4 times higher risk of SSI compared to elective procedures⁹. The presence of fecal contamination, delayed presentation, and inadequate physiological preparation are major contributing factors¹⁰.

Host-related factors such as diabetes mellitus, anemia, obesity, hypoalbuminemia, smoking, and immunosuppression further increase susceptibility to postoperative infections¹¹. Additionally, prolonged operative time (>2 hours) and higher American Society of Anesthesiologists (ASA) scores correlate strongly with SSI incidence¹².

Understanding the differential risk between elective and emergency laparotomy is essential for implementing targeted preventive strategies. Enhanced Recovery After Surgery (ERAS) protocols, standardized antibiotic timing, wound protectors, and negative pressure wound therapy have shown promising reductions in SSI rates¹³.

Given the burden of SSI and its impact on surgical outcomes, this study aims to compare the incidence and risk factors of SSI in elective versus emergency laparotomy patients in a tertiary care setting.

MATERIALS AND METHODS

Prospective comparative observational study conducted over 18 months in a tertiary care hospital.

Sample Size

200 patients undergoing laparotomy.

• Elective group: 100 patients
• Emergency group: 100 patients

Inclusion Criteria

• Age ≥18 years
• Patients undergoing midline laparotomy
• Both genders
• Informed consent obtained

Exclusion Criteria

• Laparoscopic surgeries
• Re-laparotomy within 30 days
• Patients on immunosuppressive therapy
• HIV-positive patients
• Patients with pre-existing wound infection
• Pediatric patients

Data Collection

• Demographic data: Age, gender, BMI
• Clinical parameters: Comorbidities (DM, HTN), hemoglobin, serum albumin
• Operative variables: Duration of surgery, wound classification (clean, clean-contaminated, contaminated, dirty)
• Antibiotic timing: Within 60 minutes before incision

SSI Diagnosis

Based on CDC criteria:

• Superficial incisional
• Deep incisional
• Organ-space infection

Follow-up: 30 days postoperatively.

Statistical Analysis

• Chi-square test
• Logistic regression
• p-value <0.05 considered significant

Ethical approval obtained from Institutional Ethics Committee.

RESULTS

Table 1: Demographic Profile

Emergency patients had higher prevalence of anemia and diabetes.

Table 2: Wound Classification

Majority of emergency surgeries were contaminated/dirty wounds.

Table 3: Duration of Surgery

Emergency procedures had significantly longer duration.

Table 4: SSI Incidence

p <0.001

Emergency laparotomy showed significantly higher SSI rate.

Table 5: Type of SSI

Organ-space infections were more common in emergency cases.

Table 6: Risk Factor Analysis

Emergency surgery and contaminated wounds were strongest predictors.

DISCUSSION

The present study demonstrates that SSI rates are significantly higher in emergency laparotomy (28%) compared to elective laparotomy (8%). These findings align with global data reporting SSI rates ranging from 20–35% in emergency abdominal surgeries¹⁴.

The higher incidence in emergency cases is attributable to increased contamination levels, hemodynamic instability, and inadequate preoperative optimization¹⁵. Contaminated and dirty wounds showed a fourfold increase in infection risk, similar to findings by Smith et al.¹⁶.

Operative duration exceeding two hours was another independent predictor. Prolonged exposure increases bacterial load and tissue trauma¹⁷. Diabetes mellitus doubled the risk of SSI, consistent with findings from WHO multicenter studies¹⁸.

Organ-space infections were predominantly seen in emergency surgeries, likely due to perforation peritonitis and intra-abdominal sepsis¹⁹. Early antibiotic administration and improved perioperative glycemic control have shown effectiveness in reducing SSI rates²⁰.

Enhanced recovery protocols, wound protectors, and negative pressure dressings have demonstrated significant reductions in high-risk abdominal surgeries²¹. Resource-limited settings require implementation of standardized infection prevention bundles²².

Overall, this study reinforces the need for risk stratification and aggressive preventive measures in emergency laparotomy patients.

CONCLUSION

Emergency laparotomy carries significantly higher risk of surgical site infection compared to elective procedures. Wound contamination, prolonged surgery, anemia, and diabetes are major contributing factors. Implementation of evidence-based preventive strategies and optimization of patient comorbidities are essential to reduce SSI burden.

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