Kounis syndrome after patent blue dye injection for sentinel lymph node biopsy

Background Kounis syndrome (KS) has been described as an acute coronary syndrome (ACS) associated with an anaphylactic reaction. Several triggers have been identified and the diagnostic and treatment process can be challenging. Case A 58-year-old, female patient diagnosed with breast cancer and no history of allergies had subcutaneous injection of patent blue V dye for sentinel lymph node biopsy (SLNB). Intraoperatively, she developed anaphylactic shock and was transferred to the intensive care unit (ICU). A few hours later, electrocardiographic alterations and elevation of blood troponin were observed. Emergency coronary angiography revealed no occlusive lesions in coronary vessels. Further investigation in the allergy department set the diagnosis of KS. Conclusion There are just ten cases of perioperative KS in the literature so far and here we present the first one triggered by patent blue V dye for sentinel node biopsy.