A surgical site infection (SSI) is an infection that develops at or near the surgical incision within thirty days of an operation, or up to a year if an implant was left inside the body. In Nigerian clinical practice, these infections remain a leading cause of prolonged hospital stays and extra financial burden for patients after major surgeries like Caesarean sections or exploratory laparotomies. SSIs are broadly classified into superficial incisional infections, which involve only the skin and subcutaneous tissue, and deep incisional or organ-space infections, which affect deeper soft tissues or internal organs manipulated during the procedure. Microorganisms commonly enter the surgical wound during the operation from the patient's own skin flora, operating theatre environment, or surgical team. Recognizing that these infections rarely appear immediately in the recovery room helps midwives understand that post-operative surveillance must extend well beyond the day of surgery, continuing even after the mother or patient has been discharged home.
When localized wound bacteria overwhelm the body's immune defenses and enter the bloodstream, a systemic inflammatory response known as sepsis can occur. Pathophysiologically, circulating bacterial toxins trigger widespread vasodilation, capillary leakage, and microvascular clotting, leading to tissue hypoperfusion and multi-organ dysfunction if uncorrected. Several clinical risk factors increase a patient's vulnerability to this dangerous cascade:
Early detection of a surgical site infection prevents minor inflammation from escalating into severe sepsis or wound dehiscence. Midwives must perform systematic wound assessments during routine post-operative observations. Classical local signs include progressive erythema spreading from the wound edges, localized warmth, swelling, and increasing throbbing pain that is disproportionate to the expected post-operative healing trajectory.
Purulent discharge from the incision is a definitive indicator of infection, though clear or serosanguinous fluid can sometimes be normal in small amounts initially. Systemic indicators such as pyrexia, tachycardia, and general malaise should always prompt a closer look at the surgical site. A common clinical mistake is dismissing mild wound redness as normal healing without tracking its borders with a surgical pen over a twenty-four-hour period.
When an infection is suspected, clinical assessment must be supported by appropriate investigations to guide treatment. Laboratory investigations typically include a complete blood count, which often reveals leukocytosis with a shift to the left, indicating active bacterial fighting. Inflammatory markers such as C-reactive protein (CRP) and erythrocyte sedimentation rate will also be elevated.
To identify the specific causative organism and its antibiotic sensitivities, a proper wound swab must be collected. Midwives must never swab surface crusts or pus that has merely pooled on top of uncleaned skin, because this only captures skin contaminants rather than the true pathogen living inside the wound. The correct technique involves cleaning the wound surface gently with sterile normal saline to remove surface debris, then firmly rotating a sterile swab deep within the active bed of the wound where the infection resides, before placing it into its transport medium immediately.
Medical management of established surgical site infections relies heavily on targeted antimicrobial therapy. Initially, doctors may prescribe empirical broad-spectrum antibiotics based on the most likely pathogens associated with the specific type of surgery performed. Once microbiological culture and sensitivity results return from the laboratory, treatment is streamlined to a narrow-spectrum antibiotic that specifically targets the identified organism, reducing the risk of antibiotic resistance.
Midwives play a critical role in administering these medications punctually and monitoring for adverse drug reactions or signs of treatment failure, such as persistent fever after forty-eight hours of therapy. Patient compliance is equally vital; individuals discharged on oral antibiotics must finish the full prescribed course even if their wound appears to have healed, to prevent recurrence and drug-resistant bacterial strains.
When an infection involves deep tissue collections or wound breakdown, pharmacological treatment alone is insufficient. Surgical debridement—the removal of necrotic, infected, or foreign tissue from the wound bed—is often necessary to allow healthy granulation tissue to form. In severe superficial incisional infections, the surgeon may perform wound gaping by removing a few skin sutures or staples at the bedside to allow trapped pus to drain freely.
Following drainage or debridement, appropriate wound dressings are applied. Modern dressings maintain a moist wound environment while absorbing excess exudate. For complex or deep wounds, negative pressure wound therapy may be utilized to promote blood flow and draw wound edges together. Midwives must observe and document the character of any wound drainage, the condition of surrounding skin, and the patient's pain levels during dressing changes.
Prevention remains the cornerstone of managing post-operative infections, and rigorous adherence to aseptic technique is every midwife's primary defense. Before touching any surgical dressing, healthcare providers must perform thorough hand hygiene using soap and water or alcohol-based hand rubs. Dressing changes require a non-touch technique or sterile gloves to prevent introducing exogenous bacteria into healing tissues.
Beyond technical procedures, midwives educate patients and their relatives on proper personal hygiene, optimal nutritional intake rich in proteins and vitamins to support tissue repair, and the importance of avoiding tight clothing that creates friction over the incision site. Environmental cleanliness in the ward and timely removal of indwelling urinary catheters also significantly lower the overall risk of healthcare-associated infections.