Kounis Syndrome is defined as a hypersensitivity coronary disorder constituted by the association of an acute coronary syndrome with a hypersensitivity, allergic, anaphylactic or anaphylactoid reaction, in a pathophysiologic context involving mast-cells, platelets, eosinophils and various interacting inflammatory cells. Currently, Kounis Syndrome is established in the literature, as accompanied by a plethora of clinical case reports that further elucidate its aspects. To the best of our knowledge, a specific analysis regarding the pediatric data of Kounis Syndrome has never been performed. The aim of this review was to reveal all the pediatric Kounis Syndrome cases in the literature, in an attempt to define its clinical implications in children. Moreover, based on the data of this analysis, a new classification for Kounis Syndrome is proposed, focusing mainly in the presence or the absence of allergic myocardial infarction, as the central clinical feature for the stratification of the patients' clinical manifestations.

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http://dx.doi.org/10.23736/S0026-4946.20.06007-7DOI Listing

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December 2024

Department of Pediatrics, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province, China.

Kounis syndrome is an acute coronary syndrome triggered by allergic mediators that induce coronary vasoconstriction and thrombosis, leading to further myocardial damage and anaphylactic shock. Kounis syndrome is also a rare but severe adverse reaction to the COVID-19 vaccine, a phenomenon that underscores the importance of collecting and analyzing similar cases to improve treatment and prognosis. Through comprehensive searches of the Web of Science, Embase, and PubMed databases, this study aimed to gather detailed patient data on patients who developed Kounis syndrome after receiving the COVID-19 vaccine and to further investigate the possible underlying mechanisms using currently available studies.

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Article Synopsis
  • A 44-year-old man experienced a severe allergic reaction after receiving SonoVue during a heart test, leading to chest pain and a heart attack caused by stent thrombosis and coronary vasospasm.
  • Treatment involved mechanical thrombectomy, stent replacement, and careful management to avoid worsening the patient's condition, ultimately resulting in his recovery and discharge with normal heart function.
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Kounis syndrome (KS) was first described in 1991 by Kounis and Zavras and is also known as allergic angina syndrome or allergy myocardial infarction. It is a rare, and frequently undiagnosed syndrome that is characterized by an anaphylactic reaction. Allergens cause massive degranulation of mast cells leading to coronary spasm, microvascular angina, and/or endothelial dysfunction with myocardial infarction.

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