21.   A new drug that treats irregular heartbeat may also help some people with life-threatening heart failure, Danish doctors report.

22.   About half the patients studied who had irregular heartbeats had the conditions before their heart attacks.

23.   Abnormalities in blood oxygen and carbon dioxide sometimes trigger irregular heartbeats or cause the heart to simply stop beating.

24.   Abnormalities in blood oxygen and carbon monoxide sometimes trigger irregular heartbeats or cause the heart to simply stop beating.

25.   After practicing for a week, he was retested and sent to heart specialists where a test showed the irregular heartbeat was still present.

26.   After the fight, Holyfield was found to have an irregular heartbeat, which Moorer believes has further cheapened his victory.

27.   After the quick energy blast, Ritalin can cause paranoia, delusions, fevers, and an irregular heartbeat, Lopez said.

28.   Bradley suffers from an irregular heartbeat and he must be anesthetized for three or four minutes if an electric shock is required to return his heart rhythms to normal.

29.   But after suffering an irregular heartbeat this past season, health concerns and a desire to shred the stresses of the job won out.

30.   But the FDA has dragged its feet, citing concerns that Cisapride might lead to irregular heartbeats.