Continuous, on-line, real-time spectral analysis of systemic arterial pressure signals

T. B.J. Kuo, S. H.H. Chan

Research output: Contribution to journalArticlepeer-review

129 Citations (Scopus)


We present in this communication an algorithm that offers continuous, on- line, real-time analysis of the power spectrum (CORAPS) of systemic arterial pressure (SAP) signals. Based on direct fast Fourier transform of raw SAP signals into power spectral density, it is suitable for the delineation of acute SAP spectral changes over time after physiological or pharmacological perturbations. Thus it is an improvement over most current methods, which only generate the spectra off-line or from intermittent data. Furthermore, all executions can be accomplished economically with a general-purpose personal computer. We demonstrated and quantified vivid sequential alterations in the low-frequency components (<3 Hz) of the SAP spectrum, which purportedly reflect the influence of vasomotor, baroreceptor, and respiratory activity on SAP during pentobarbital administration or transient hypertension. Three window options incorporated into the algorithm further improved the frequency or temporal resolution and discrimination of the spectral changes during abrupt hypertension or hypotension. Thus our CORAPS algorithm may be useful as an on-line monitor for acute hemodynamic changes.

Original languageEnglish
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Issue number6 33-6
Publication statusPublished - 1993
Externally publishedYes


  • personal computer
  • power spectrum
  • rat
  • two- and three-dimensional power spectrogram

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)


Dive into the research topics of 'Continuous, on-line, real-time spectral analysis of systemic arterial pressure signals'. Together they form a unique fingerprint.

Cite this