1.   Another complication is that the defibrillators, which shock hearts out of otherwise fatal arrhythmias, may also accelerate the course of the underlying heart failure.

2.   His inventins include a lighting device to help shift workers adjust their internal clocks and a catheter that destroys the heart cells responsible for fatal arrhythmia.

3.   Medical science keeps finding ways to prevent fatal arrhythmias, Schaal said.

4.   Scarring, in turn, can lead to potentially fatal arrhythmias.

5.   That scar tissue, in turn, can trigger fatal arrhythmias, uncontrolled flutterings of the heart.