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This work investigates the very low frequency (VLF) modulation of QRS slopes and heart rate variability (HRV). Electrocardiogram (ECG) and respiratory flow signal were acquired from patients with dilated cardiomyopathy and ischemic cardiomyopathy. HRV as well as the
upward QRS slope (IUS) and downward QRS slope (IDS) were extracted from the ECG. The relation between HRV and QRS slopes in the VLF band was measured using ordinary coherence in 5-minute segments. Partial coherence was then used to remove the influence that respiration simultaneously exerts on HRV and QRS slopes. A statistical threshold was determined, below which coherence values were considered not to represent a linear relation.
CitacióHernando, D. [et al.]. Influence of respiration in the very low frequency modulation of QRS slopes and heart rate variability in cardiomyopathy patients. A: Computing in Cardiology. "Computing in Cardiology 2013, Volume 40". Zaragoza: 2013, p. 117-120.