Simultaneous recording of gastric and duodenal electrical activity

A method for simultaneous recordings of the gastric and duodenal smooth muscle electrical activity is described. Three pairs of silver electrodes are arranged along one side of a double lumen intestinal tube, which is fixed to the mucosal wall by suction. The slow pacesetter waves (BER) and the fast spikes accompanying motor activity are recorded on separate channels, together with registrations of intraluminal pressure variations and respiration.