2025 Volume 32 Article ID: 32_R3
Horner’s syndrome (HS) has been reported to be caused by other medical problems; however, it is not well-recognized as a complication after median sternotomy (MS). Our patient experienced excessive preoperative sweating, which assisted in diagnosing HS, postoperatively. Accordingly, we carefully observed other cases and discovered five patients in three years who developed HS after MS. Brachial plexopathy is a neurological complication that can occur after MS. These complications can be prevented by taking necessary precautions while using a retractor because the extended force is of sufficient magnitude to fracture the upper rib and may lead to such complications. The medical staff should be aware of HS as a potential complication after MS.