Cardiac arrest due to critical stenosis of a bicuspid aortic valve mimicking left main coronary artery occlusion on ECG.

A 49-year-old man presented to the emergency room after a cardiac arrest. On arrival, the patient's ECG showed ST-segment elevations in the aVR and anteroseptal leads with diffuse ST depression suggestive of left main coronary artery occlusion. Subsequent coronary catheterisation showed normal coronaries but revealed severe stenosis of his bicuspid aortic valve. A surgical replacement of the aortic valve was performed, and the patient recovered successfully.