The Unusual Suspect: Gadobenate-Dimeglumine Induced Kounis Syndrome.

A myocardial bridge has traditionally been considered a benign condition characterized by an atypical intramyocardial route of a segment of one of the major coronary arteries. However, the clinical complications of myocardial bridges can be dangerous. These potential complications include acute coronary syndromes, arrhythmias, ventricular dysfunction, and sudden death. Myocardial bridges are suspected to be adjuvant of Kounis syndrome, which is defined as an acute coronary syndrome caused by an allergic reaction. Due to high epidemiologic prevalence, clinical suspicion of a myocardial bridge should be considered in atypical and typical presentations of chest pain, especially in patients with low-risk factors for atherosclerotic disease. A male in their late 30's presented with non-ST elevation myocardial infarction suspected to be secondary to Kounis syndrome after gadobenate dimeglumine contrast media was used for an imaging study. His clinical presentation was further complicated when he was found to have a mid-left anterior descending coronary artery myocardial bridge.