We suggest that physiological surges (signal inputs) in sympathetic activity characterizing REM sleep do not lead to clinically significant fluctuations in beat-to-beat dynamicity of ventricular repolarization.
7 9 BPV is characterised by short-term fluctuations (eg, beat-to-beat, minute-to-minute, hour-to-hour, day-to-night and within-visit) and long-term fluctuations (eg, day-to-day, week-to-week, month-to-month and year-to-year).
Minor fluctuations in beat rate are well tolerated, as evidenced by similar ratings between changing rates and the same rate.
Respiratory sinus arrhythmia (RSA) is the beat-to-beat fluctuation in heart rate at the frequency of the respiratory cycle.
Electrode catheters allowed assessment of the effects of severe LAD stenosis on the levels of VF threshold and T-wave alternans (TWA), a beat-to-beat fluctuation in the ST-segment and T-wave, which has been shown to reflect susceptibility to malignant ventricular arrhythmias.
Digital 24-hour Holter electrocardiograms were recorded and three MSsE parameters (slope 5, Area 6 20, Area 6 40) associated with the multiscale correlation and complexity of heart beat fluctuation were calculated.
As shown in supplementary material Fig. S4A and Fig. 5A, there was some dispersion of θR that could have come from the fluctuation in the beat forms of swimming spermatozoa.
This algorithm, instead of removing trend with a priori mathematical formulas such as linear or polynomial functions [14], [29], could evaluate the hidden dynamics of heart beat fluctuations better [9], [10], [29].
