Harvard Men's Health Watch
How serious is a mild narrowing of the carotid artery?
On call Q. What is the significance of mild narrowing of the carotid artery detected by an ultrasound? I have never had any symptoms of stroke. A. “Mild” narrowing ranges from 15% to 49% blockage of the artery. Over time, this narrowing can progress and lead to a stroke. Even if it doesn’t progress, mild narrowing is a sign of early blood vessel disease and calls for preventive measures.