Spectral analysis of intraluminal pressure in the anastomosed ileal segment of the rat in vitro

Abstract Spectral analysis of the spontaneous intraluminal pressure of the isolated ileal segments in vitro was performed (1) before transection and soon after union (acute model) and (2) until 67 days after anastomosis (chronic model). A single peak was found in the spectral arrays of the acute model before transection. However, more than two peaks were clearly found in spectral arrays of both acutely or chronically anastomosed models. Motor activities of both oral and anal part of the anastomosis seem to be reflected in the spectral analysis of the intraluminal pressure of the isolated segments in vitro. More than two peaks in spectral arrays suggest that the synchronized and coordinated motor activity was not recovered, at least, until 67 days after anastomosis.