Vancomycin Anaphylaxis and Kounis Syndrome Case Report.

Preoperative antibiotic administration has become a standard practice to mitigate the risk of surgical site infections; however, it is not devoid of potential complications. This report delves into the case of a 67-year-old male who underwent a routine preoperative vancomycin infusion prior to an elective total knee arthroplasty and subsequently experienced an unexpected adverse reaction including diaphoresis, cutaneous flushing, hypotension, and eventually unresponsiveness involving cardiovascular collapse and non-ST-segment elevation myocardial infarction (NSTEMI), despite minimal underlying coronary artery disease. The report focuses on the management of the emergent condition at our facility, highlighting the immediate response and following management of additional complications. The successful management led to a full recovery with the electrocardiogram (EKG) returning to the preoperative baseline of sinus rhythm with first-degree atrioventricular (AV) block within two hours of the event. This study contributes valuable insights into the complexities associated with preoperative antibiotic use, underscores the importance of understanding individual patient profiles, and raises awareness of potential risks and strategies to be used for antibiotic administration from a healthcare professional perspective.