Implantable cardioverter-defibrillators have made it possible to analyze heart rate variability patterns just preceding episodes of ventricular tachycardia. Signs of sympathetic activation and of a reduced vagal modulation were indicated by shorter cardiac cycle lengths, lower total power, and a significantly increased low-frequency to high-frequency ratio. We also observed a sharper negative slope in the power-frequency relationship. Our findings support the concept that the minutes preceding the onset of ventricular tachycardia are characterized by changes in neural control mechanisms.
|Number of pages||4|
|Publication status||Published - 2001|
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine