1.   A large number of Americans suffer from a coronary blockage but may not have symptoms, and a smaller number experience pain from ischemia resulting from the blockage.

2.   He has no coronary blockages.

3.   The device irradiates arteries to prevent the return of coronary blockages pressed open by balloons.

4.   The results showed no coronary blockage.

5.   After doctors discovered he had suffered a heart attack, Lasorda underwent an angioplasty procedure last Wednesday in which a coronary blockage was opened.

6.   Balloon catheters clear coronary blockages and deliver stents, tiny metal tubes that keep the passages open.