11.   Apparently, West has had an irregular heartbeat that doctors told him was caused by nervous tension.

12.   At one time there was a concern he might have a slight irregular heartbeat, but it is currently undetectable.

13.   Because high levels of potassium can cause an irregular heartbeat, it is always given slowly.

14.   Because Coleman had not played this season because of an irregular heartbeat, the Nets are accustomed to not having him on the floor.

15.   Before the study, Ms. Wan signed a consent firm acknowledging that the procedure could cause shortness of breath, wheezing and irregular heartbeat.

16.   Bird revealed this week that he had an irregular heartbeat called atrial fibrillation at the end of his playing career but never told the Celtics about it.

17.   Both deaths were initially determined to be from an irregular heartbeat and were considered natural.

18.   Bradley, who was hospitalized briefly in California Friday because of an irregular heartbeat, Saturday said his health is fine and that his campaign will not be affected.

19.   A few calcium channel blockers have been approved by the Food and Drug Administration to relieve pain from angina and to control irregular heartbeat.

20.   A more severe decline can cause extreme muscle spasms, convulsions, an irregular heartbeat and even death.