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Abstract
Long-term measurements have been made of peristaltic pressure variations 8 and 23 cm proximally to the gastro-oesophageal sphincter. The investigation was performed using perfused catheter systems and results of the 12-h measuring period were recorded on tape recorder. The peristaltic pressure variations were frequency analysed using a Fast Fourier Transform analyser.
The investigation showed that the significant information regarding the pressure variations can be registered by recording systems with an upper frequency limit of at least 2 Hz. The pressure variations were built up more rapidly proximally in the organ than distally. Repeated investigations on a single subject showed that the intravariation lies within the intervariation in the subjects tested.