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Search: L773:0002 9513 > (1977-1979)

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1.
  • Ask, Per, et al. (author)
  • Frequency content of esophageal peristaltic pressure.
  • 1979
  • In: American Journal of Physiology. - 0002-9513 .- 2163-5773. ; 236:3, s. E296-300
  • Journal article (peer-reviewed)abstract
    • Fourier analysis of esophageal peristaltic pressure waves was performed by computer fast Fourier transform. The highest power spectral density was obtained in the frequency range below 1 Hz. The Fourier analysis showed spectral components up to about 12 Hz in the upper esophageal sphincter (UES). The significance of different frequency components was investigated by low-pass filtering at different cut-off frequencies. A reduction in the amplitude of UES contractions was obtained at a cut-off frequency of 4 Hz, whereas the cut-off frequency of 8 Hz did not show any distortion. For perfused manometry systems, only a low-compliance perfusion pump will have sufficient bandwidth for accurate recording of esophageal peristaltic pressures.
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2.
  • Ask, Per, et al. (author)
  • Static and dynamic characteristics of fluid-filled esophageal manometry systems
  • 1977
  • In: American Journal of Physiology. - 0002-9513. ; 233:5, s. E389-E396
  • Journal article (peer-reviewed)abstract
    • Esophageal manometric systems with water-filled catheters have been characterized by the use of model experiments. The examined parameters have been: catheter dimension, catheter compliance, catheter resistance, pump type, pump compliance, and perfusion flow. Accurate static pressure measurements have been obtained for perfused systems independently of the investigated parameters. The dynamic characteristics vary with catheter diameter and perfusion flow. For catheters with low diameter, a narrow bandwidth is obtained for the investigated perfusion flows. The results have been expressed in terms of an electric model of the measurement system. Perfusion pumps with low compliance are recommended to improve the dynamic properties of the measurement system.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Ask, Per (2)
Tibbling, Lita (2)
Öberg, Åke (1)
Öberg, P. Åke (1)
University
Linköping University (2)
Language
English (2)
Research subject (UKÄ/SCB)
Engineering and Technology (1)
Medical and Health Sciences (1)

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