A Surgical Site Infection Case: From Complication to Prevention
Greetings of the day,
Surgical Site Infection (SSI) is one of the important healthcare-associated infections that can significantly affect patient recovery after surgery. The risk becomes more complex in patients undergoing major oncological procedures, particularly extensive head and neck surgeries involving reconstruction. Such procedures may involve prolonged surgery, extensive tissue dissection, complex wound sites, vascular anastomosis, and postoperative flap monitoring. In addition to surgical factors, patient-related conditions such as diabetes can further influence wound healing and susceptibility to infection.
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An adult male patient with a history of Type 2 Diabetes Mellitus and hypertension underwent major surgery for a left buccal mucosal malignancy. The surgical procedure involved left buccal mucosa composite resection with ALT flap reconstruction along with additional excision and artificial dressing. The surgery was performed on 18 August 2026.
The postoperative period was complicated by a vascular event involving arterial thrombosis at the anastomotic site. Because of the vascular complication, re-exploration was required. The operative documentation confirmed arterial thrombosis at the anastomotic site. This was an important event in the subsequent clinical course because adequate vascular perfusion is essential for maintaining the viability of a reconstructed free flap.
The postoperative vascular complications, including SVT and arterial thrombosis, resulted in compromised perfusion of the ALT flap. This subsequently contributed to flap failure and local tissue compromise. Once tissue viability is compromised, wound healing can become delayed and the local surgical site may become more susceptible to infection. In this case, the underlying Type 2 Diabetes Mellitus was also considered a contributing factor because it can further affect wound healing and increase susceptibility to infection.
During the postoperative course, changes in the surgical wound led to microbiological investigation. A pus specimen was collected and sent for culture and sensitivity testing. The microbiology report documented occasional pus cells on Gram stain. Culture showed scanty growth of Candida species and Staphylococcus species. The susceptibility report also documented the antimicrobial susceptibility pattern of the organisms identified, with the laboratory advising clinical correlation.
From an Infection Prevention and Control perspective, microbiological findings should always be interpreted together with the clinical condition of the patient and the appearance and status of the surgical wound. A culture result should not be considered independently from the clinical picture. The timing of specimen collection, type and site of specimen, wound findings, surgical history, tissue condition, and the patient's underlying risk factors are all important when reviewing a suspected SSI.
The RCA performed for this case identified a clear clinical sequence. Postoperative vascular complications, including SVT and arterial thrombosis, resulted in compromised vascular perfusion of the ALT flap, followed by flap failure and local tissue compromise. The resulting impairment in tissue viability and wound healing increased the susceptibility of the surgical site to infection. The patient's underlying Type 2 Diabetes Mellitus further contributed to the risk of delayed wound healing and infection susceptibility.
One of the important lessons from this case is that an SSI does not necessarily have a single cause. A surgical wound infection may develop through a combination of patient-related factors, surgical complexity, vascular complications, tissue viability, wound healing, and other clinical circumstances. Therefore, an RCA should examine the complete clinical pathway rather than focusing only on the presence of microorganisms or assigning responsibility to an individual.
The corrective and preventive actions in this case focused on wound management, maintaining strict aseptic dressing practices, appropriate antimicrobial management, and management of the compromised surgical site. The case subsequently required further surgical management, including major debridement and PMMC flap reconstruction in the setting of ALT flap failure and tissue compromise.
For Infection Control teams, this case highlights the importance of close postoperative surveillance in patients undergoing complex reconstructive surgery. Monitoring should not be limited to conventional signs of infection but should also include observation of wound condition and tissue viability. Any evidence of vascular compromise, deterioration of the surgical site, abnormal wound discharge, or other concerning clinical changes should be communicated promptly to the treating surgical team so that appropriate assessment and intervention can be initiated without unnecessary delay.
Diabetes management is another important consideration in patients at risk of postoperative wound complications. Maintaining appropriate glycemic control and ensuring regular clinical monitoring can support overall postoperative management. In complex surgical patients, coordination between the surgical team, nursing team, Infection Prevention and Control team, microbiology laboratory, pharmacy, and other relevant departments can help ensure that complications are recognized and managed in a timely manner.
The case also demonstrates the importance of appropriate specimen collection and microbiological documentation. When a wound infection is suspected, clearly documenting the specimen type and exact collection site is important for surveillance, interpretation, and subsequent infection-control review. Accurate documentation allows the Infection Control team to correlate microbiological findings with the clinical site and the patient's surgical history.
Another important aspect is the role of RCA and CAPA in infection prevention. RCA should not be used simply to identify an individual error. Its purpose should be to understand the sequence of events, identify contributing factors, determine where processes can be strengthened, and establish corrective and preventive measures. CAPA should then be monitored to ensure that the identified improvements are actually implemented and sustained.
This case reinforces the principle that SSI prevention continues well beyond the operating room. Maintaining surgical asepsis is essential, but successful prevention also depends on postoperative wound surveillance, early recognition of vascular and tissue complications, appropriate management of patient-related risk factors, timely microbiological investigation, effective communication, and multidisciplinary review.
For Infection Prevention and Control professionals, every SSI provides an opportunity to learn from the complete patient journey. Understanding how vascular complications, tissue viability, wound healing, diabetes, and microbiological findings interact can help teams develop more meaningful preventive strategies. A structured RCA combined with practical CAPA can help convert an individual incident into an opportunity for broader quality improvement and safer patient care.
This case is presented for educational and infection prevention purposes, with all direct patient-identifying information intentionally removed. The clinical details should be interpreted within the context of the treating team's assessment and the hospital's approved clinical and infection-control protocols.
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