Days earlier, his heart had started beating irregularly for several minutes, to the point where his life was in danger.

Her heart was beating irregularly and she felt faint.

This causes the lower chambers (the ventricles) to beat irregularly.

Their hearts begin beating irregularly or may start quivering instead, making it impossible for the heart to pump blood throughout the body.

A few drops in an infusion of other herbs calms the heart if it is beating irregularly.

It seemed to be beating very fast and irregularly.

I have fainting spells when my heart is beating irregularly.

Since the end of May it had been beating irregularly.

These toxins may cause the heart to beat irregularly or stop beating, causing death.

When he came to see me, he was still taking it, but his heart had started to beat irregularly once more.