title: Frequency content of esophageal peristaltic pressure.
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.
mesh_terms: D000328:Adult; D004947:Esophagus / Q000502:physiology*; D005583:Fourier Analysis; D005769:Gastrointestinal Motility; D006801:Humans; D008365:Manometry; D008433:Mathematics; D010528:Peristalsis; D011312:Pressure