منابع مشابه
Fluctuation Index as a Measure of Heartbeat Irregularity
A method is proposed to analyze the heartbeat waveform that can yield a reliable characterization of the structure of the pulses. The measure suggested is fluctuation index that is related to another measure found effective in describing chaotic behaviors in a wide variety of physical systems. When applied to the ECG data that include ventricular fibrillation, the fluctuation index is shown to ...
متن کاملTime-frequency analysis of fetal heartbeat fluctuation using wavelet transform.
We examined whether the nonlinear control mechanism of the fetal autonomic nervous system would change in various fetal states. Eight thousand or more fetal heartbeats were detected from normal, hypoxemic, and acidemic fetuses. Fetal heart Doppler-signal intervals were determined in a high-precision autocorrelation method, and a time series of fetal heart rate fluctuation was obtained. The dist...
متن کاملVisual monitoring of heartbeat and respiration in Antarctic seals
Heartbeat and respiration of southern elephant seals (Mirounga leonina), Weddell seals (Leptonychotes weddellii) and Antarctic fur seals (Arctocephalus gazella) were monitored simultaneously using a visual and non-intrusive method, at King George Island, South Shetland Islands. All three species demonstrated sleep apnoea with reduced heart rate. In adult elephant seals, heartbeat fell 18% in ap...
متن کاملVascular endothelial ageing, heartbeat after heartbeat.
The vascular endothelium starts to age at the first heartbeat. There is no longer a need to demonstrate that an increased resting heart rate--above 70 b.p.m.--is associated with the onset of cardiovascular events and reduces lifespan in humans. Each cardiac cycle imposes a mechanical constraint on the arteries, and we would like to propose that this mechanical stress damages the vascular endoth...
متن کاملHolter ECG monitoring of sympathovagal fluctuation during bronchoscopy.
BACKGROUND AND AIMS The changes of autonomic nervous activity during bronchoscopic procedures are closely related to the development of cardiovascular complications. We aimed to evaluate the changes of autonomic nervous activity during bronchoscopic procedures using R-R interval variability from electrocardiograms (ECGs) obtained during diagnostic bronchoscopy. METHODS Twenty-four patients wh...
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ژورنال
عنوان ژورنال: THE JOURNAL OF JAPAN SOCIETY FOR CLINICAL ANESTHESIA
سال: 1999
ISSN: 0285-4945,1349-9149
DOI: 10.2199/jjsca.19.195