The narrower artery opening limits blood flow.

As the arteries narrow and harden, it becomes more difficult for blood to flow through them.

As symptoms are disclaimed, arteries narrow, hypertension increases and risks rapidly rise.

Most patients in the control group, by contrast, had narrower coronary arteries at the end of the trial than the start.

Ahead, a dark, narrow artery stretched out for twenty feet or more before curving leftward.

It seemed as if all the vitality of France were flowing up this narrow artery.

Other than my narrow arteries, I am in good health and I've never had a stroke or even a mini-stroke.

Stress tests using treadmills, for instance, were based on the idea that they could identify people whose narrow arteries put them at risk for their first heart attacks.

"We call it the river," said Mr. Yeomans, 72, pointing toward the narrow, shallow artery that could be forded with just a couple of splashy strides.

Smaller women also tend to have narrower arteries, which makes angioplasty trickier and potentially more dangerous.