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ROBBI 985 XP SOUNDS SERIES
Approach to an irregular time series on the basis of the fractal theory. Respiration and abnormal sleep in patients with congestive heart failure. Analysis of sleep-stage characteristics in full-term newborns by means of spectral and fractal parameters. Use of the fractal dimension for the analysis of electroencephalographic time series. Other mechanisms, particularly chemical instability in the respiratory control system, are likely to play a role in the genesis of PB.Īccardo, A., Affinito, M., Carrozzi, M., & Bouquet, F. These fluctuations can be effectively detected by the fractal dimension, but classical spectral methods provide substantially the same information. Our results provide evidence that during PB in HF patients, EEG activity often, but not always, fluctuates synchronously with the ventilatory oscillation. Overall, the two EEG-derived parameters showed the same coherence with the ventilatory oscillation (mean coherence ± SD: 0.65 ± 0.25 vs 0.66 ± 0.23, for FD and WMF respectively, p = 0.44). In the remaining patients, neither FD nor WMF showed a clear oscillatory pattern synchronous with MV. Most patients (10/17) showed a well defined oscillation in FD and WMF at the frequency of PB closely linked (coherence > 0.7) with the oscillation of MV. The relationship between minute ventilation (MV) signal and FD and WMF was assessed by coherence analysis. EEG activity was measured by the fractal dimension (FD) and by a spectral technique (weighted mean frequency, WMF) in 17 stable HF patients (mean age ± SD: 57☑0 yrs, NYHA class: 2.6 ± 0.4, LVEF: 24 ± 6%), with sustained PB during supine rest. In this study we investigated the existence of an oscillation in EEG activity during PB in these patients and assessed its relationship with the ventilatory oscillation. A role for rhythmic shifts in the level of wakefulness has been suggested, but their existence has never been proven. The physiological mechanisms responsible for periodic breathing (PB) in heart failure (HF) patients are still debated.
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