Kounis Syndrome Caused by Double Allergens: The More Allergens Present, the Easier, the Quicker, and the More Severe the Anaphylaxis
Kounis syndrome, a condition characterized by the occurrence of acute coronary events triggered by allergic or hypersensitivity reactions, has been increasingly recognized in clinical practice. This syndrome is typically classified into three types: type I involves coronary spasm without coronary artery disease, type II involves coronary spasm with underlying coronary artery disease, and type III involves coronary stent thrombosis. The case discussed in this article highlights the role of multiple allergens in exacerbating the severity and rapidity of anaphylactic reactions, leading to the development of Kounis syndrome.
The case involves a 42-year-old Chinese male with no prior history of cardiovascular disease but a history of bee stings that had previously caused no significant sequelae. During a cycling activity, the patient was stung by a bee again and immediately developed severe symptoms, including sweats, dizziness, headaches, shortness of breath, urinary incontinence, hypotension, hypoxygenation, tachycardia, and confusion. Electrocardiographic findings revealed ST-segment depression in leads II-III and ST-segment elevation in lead aVR. Laboratory tests showed eosinophilia and elevated cardiac enzymes, but coronary angiography revealed normal coronary arteries, consistent with Kounis type I syndrome progressing to acute myocardial infarction.
Interestingly, specific immunoglobulin tests were positive for a combination of tree allergens (willow, poplar, and elm). This finding suggests that the patient was sensitized to multiple allergens, which may have contributed to the severity of the anaphylactic reaction. The patient was successfully treated with anti-allergic medications and fluid replacement, leading to complete recovery.
This case underscores the importance of considering simultaneous exposure to multiple allergens in the evaluation of anaphylaxis and its cardiovascular complications. Immunoglobulin E (IgE) antibodies play a central role in allergic reactions. These antibodies are synthesized and released by B lymphocytes in response to antigen exposure and are involved in a complex interplay between genetic, cytokine, and environmental factors. Elevated IgE levels are associated with various conditions, including atopic diseases (e.g., asthma, allergic rhinitis, atopic dermatitis), parasitic infections, cutaneous diseases, neoplastic diseases, and immune deficiencies.
Conditions associated with unusually high serum IgE levels (greater than 1000 IU/mL) include allergic bronchopulmonary aspergillosis, allergic fungal sinusitis, atopic dermatitis, human immunodeficiency virus infection, IgE myeloma, lymphoma, systemic parasitosis, tuberculosis, and hyper IgE syndrome. Elevated IgE levels have also been linked to increased cardiovascular mortality and are found to be elevated in acute myocardial infarction, stable and unstable angina, correlating with plaque destabilization and the severity of acute myocardial infarction.
IgE antibodies bind to high-affinity FcεRI and FcγRI receptors and low-affinity FcεRII and FcγRII receptors on mast cells and basophils. When a critical number of allergen molecules cross-link their corresponding receptor-bound IgE antibodies, an allergic or anaphylactic reaction is triggered. It has been estimated that approximately 1000 bridges between IgE molecules are necessary to trigger a cell, out of a total of 500,000 to 1,000,000 IgE molecules on the cell surface. This critical number of bridges can be accumulated by more than one non-cross-reactive allergen and its corresponding IgE antibody.
Patients who are allergic to and simultaneously exposed to several allergens tend to experience more severe symptoms than mono-sensitized individuals. This phenomenon may result from the additive effect of IgE antibodies with different specificities, which initiate allergic inflammation. Studies have shown that IgE antibodies with different specificities can join forces to trigger mast cells and basophils, even when the number of IgE antibodies of each specificity is below the threshold required to trigger a reaction individually. This additive effect explains why patients exposed to multiple allergens may experience more severe and rapid anaphylactic reactions.
The patient described in this case had no prior history of cardiovascular disease or severe allergic reactions despite previous bee stings. However, during the current episode, the patient developed severe anaphylactic symptoms culminating in Kounis syndrome type II (acute myocardial infarction) and was found to be sensitized to additional allergens (willow, poplar, and elm). It appears that these allergens acted synergistically to trigger the anaphylactic cardiovascular event.
Cardiologists and emergency care physicians should be aware that IgE sensitization to an allergen should not be evaluated in isolation but in the context of possible multi-allergen sensitization and exposure. This approach is crucial for the accurate diagnosis and management of patients presenting with anaphylaxis and associated cardiovascular complications.
In conclusion, the presence of multiple allergens can significantly increase the severity and rapidity of anaphylactic reactions, leading to the development of Kounis syndrome. The additive effect of IgE antibodies with different specificities plays a critical role in triggering allergic inflammation and cardiovascular events. Clinicians should consider the possibility of multi-allergen sensitization in patients presenting with anaphylaxis and associated cardiovascular symptoms to ensure timely and appropriate management.
doi.org/10.1097/CM9.0000000000000946
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