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Myocardial infarction occurring during the course of type I hypersensitivity constitutes Kounis syndrome. We report a case of a 38-year-old man who presented with anterior ST elevation myocardial infarction and peripheral blood eosinophilia. He had rhinitis and malaise for several days prior to presentation. There was no urticarial rash or pruritus to suggest hypersensitivity. Coronary angiogram revealed only mild plaque disease. Blood investigations revealed moderate eosinophilia and elevated IgE levels. CT of the thorax revealed fluid extravasation at multiple sites. Screening for a possible secondary cause for eosinophilia revealed hypersensitivity to multiple antigens. A diagnosis of Kounis syndrome was made. Within days of starting steroids and antihistamines, the patient's eosinophil count returned to normal with improvement of clinical picture. This case differs from classical Kounis syndrome as there was no acute allergic reaction (except atopic rhinitis). Fluid extravasation at multiple sites has not been described in previous cases.

Myocardial infarction associated with eosinophilia and plasma extravasation at multiple sites. A variant of Kounis syndrome