Diagnosis of Aortic Dissection Presenting as ST-Elevation Myocardial Infarction using Point-Of-Care Ultrasound

Abstract

BackgroundAortic dissections can present with a broad spectrum of signs and symptoms, making them difficult to diagnose in the emergency department (ED). Aortic dissections can cause occlusion of the coronary arteries, mimicking an acute ST-elevation myocardial infarction (STEMI). Emergency point-of-care ultrasound (POCUS) may be a useful diagnostic tool to help differentiate aortic dissection from a primary myocardial infarction. Case ReportA 69-year-old man with no medical history presented to our ED complaining of chest pain. His electrocardiogram revealed new and dynamic ST-segment elevations consistent with a septal myocardial infarction. While the patient was being prepared for the cardiac catheterization laboratory, the treating emergency physician performed a POCUS study. The scan revealed an echogenic flap in the ascending aorta, significant aortic regurgitation, and intimal flaps in the carotid artery and abdominal aorta. The diagnosis of a type A aortic dissection was confirmed with computed tomography angiography. Why Should an Emergency Physician be Aware of This?Differentiating an acute STEMI from an aortic dissection can be extremely difficult in the ED. It is important not to delay reperfusion therapy for patients with a true STEMI; however, the same treatment can be lethal for patients with aortic dissection. Emergency POCUS is a fast and accessible test that has been shown to have high specificity for the diagnosis of aortic dissection in the ED. POCUS may be a useful tool to help emergency physicians diagnose aortic dissection presenting with STEMI.