An 82 year old man with severe bilateral (90% on the right side, 80% on the left side) stenosis at the origin of the internal carotid artery (ICA), demonstrated by ultrasound, and recurrent transient ischaemic attacks causing weakness of the left arm was referred for stenting of the right ICA. The patient was pre-treated with aspirin and clopidogrel and the activated clotting time …