Postoperative Altered Mental Status: A Case Report and Diagnostic Dilemma.

Postoperative altered mental status (AMS) is a prevalent and complex issue that poses a significant diagnostic challenge in the clinical setting. Clinical presentation consists of cognitive disturbances that can range from mild confusion to coma. Given the complexity and variability of AMS, each patient requires a careful and thorough evaluation to identify the underlying cause. Thus, we present a case of a 57-year-old male with confirmed left knee septic arthritis, whose admission was complicated by AMS following several incision and drainage procedures. We highlight the importance of considering a broad differential diagnosis when evaluating postoperative AMS, including electrolyte disturbances and systemic conditions. The case also discusses the importance of early recognition, interdisciplinary collaboration, and a comprehensive diagnostic strategy. By adopting a comprehensive and collaborative approach, healthcare providers can optimize patient outcomes and minimize complications in postoperative AMS cases. The patient's AMS was ultimately attributed to a combination of metabolic disturbances, drug-related factors, and systemic conditions. His severe psychiatric symptoms were successfully managed with targeted pharmacologic interventions.