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  • 1990-1994  (2)
  • 1900-1904
  • Discrete Hilbert transform  (1)
  • Heart-rate fluctuations  (1)
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  • 1990-1994  (2)
  • 1900-1904
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    High-frequency and low-frequency heart-rate fluctuation analysis in newborns—A review of possibilities and limitations (1992)
    Springer
    Basic research in cardiology 87 (1992), S. 193-204 
    Details
    ISSN: 1435-1803
    Keywords: Heart-rate fluctuations ; neonates ; respiratorymovements ; respiratory sinusarrhythmia ; nonrespiratoryrhythms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Respiratory sinus arrhythmia (RSA) has been traditionally defined as the high-frequency component of heart-rate fluctuations (HRF) synchronous with the respiratory movements (RM), i.e., the frequency of RSA corresponds to the respiration rate. It can be shown that at defined relations of mean heart and respiration rate some essential effects must be taken into consideration in studies using RSA parameters The relevance of these effects is shown and a new strategy of RSA quantification demanded, at least in neonates. The diagnostic importance, physiological background and future application of the low-frequency components of the neonatal HRF are reviewed on the basis of our own results. Nonrespiratory cardiovascular HRF cannot always be detected in the neonate by power spectral analysis. Movement-related HRF have a potential diagnostic importance per se, but may also artefactually disturb the quantification of other HRF components. Long-term trends can be used to describe sleep-state related trends and their disturbances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00801966
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Use of discrete Hilbert transformation for automatic spike mapping: A methodological investigation (1991)
    Springer
    Medical & biological engineering & computing 29 (1991), S. 242-248 
    Details
    ISSN: 1741-0444
    Keywords: Discrete Hilbert transform ; EEG ; Fast Fourier transform ; Spike mapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract On the basis of discrete Hilbert transform (DHT) realised by fast Fourier transform (FFT), a new strategy for automatic spike mapping is introduced. The further computation of the EEG time series after DHT results in the time series of the momentary power and the momentary frequency. Both are used for the solution of the main requirements of automatic spike mapping. The spike-mapping concept introduced meets the requirements of efficient automatic spike detection and also has an insensitivity with regard to EMG interference and transient signal components, a frequent cause of false positive detections. Additionally, there are advantages if the momentary power of the spike is mapped instead of the spike potential. the use of momentary power makes a combination of power spectral mapping and spikemapping strategies possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02446705
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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