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Takashi Morita Department of Urology, Akita University School of Medicine, Akita (Director: Prof. Seigi Tsuchida) Percntly, a concept of a renal pelvic pacemaker activity controlling ureteral peristalsis has been put forward by several workers (Constantinou 1974, Hrynczuk & Schwartz 1975, Tsuchida & Yamaguchi 1977, Constantinou & Hrynczuk 1977). However, the data is very meagre about the origin and propagation of contraction waves in the renal pelvis. Furthermore, the relation between electrical activity and pressure changes of the renal pelvis has not been understood. To examine these problems, the present paper describes a new method which enables one to record electromyogram continuously on various regions of the renal pelvis and ureter, and to measure simultaneously pelvic pressure changes associated with those electrical activities in vitro. At the proximal end of the renal pelvis, the interval of EMG was constant throughout the recording period. Pressure variations of the renal pelvis were also rhythmic, and the mean value of the interval between the pressure complexes was the same as that of EMG on the proximal end of the renal pelvis. These electrical waves generally propagated toward the ureter through the pelviureteric junction. However, some waves faild to conduct within the pelvis as well as at the pelviureteric junction. The ratio of discharge interval between the proximal end and the center of the pelvis were in order of 1:1, 2:1, 3:1 etc., and that between the proximal end and the pelviureteric junction were 1:1, 2:1, 3:1 etc. Thus the discharge interval at the pelvic center, pelviureteric junction and the. ureter were found to be a multiple of the pacemaker interval at low perfusion rate into the renal pelvis. However, at such a high perfusion rate as 1.22ml/min, pacemaker discharge always propagated toward the ureter.

nihon hinyoukika gakkai zasshi/nippon hinyokika gakkai zasshi

THE IN VITRO STUDY OF THE PACEMAKER ACTIVITY OF THE CANINE RENAL PELVIS THROUGHOUT SIMULTANEOUS RECORDINGS OF PELVIC PRESSURE CHANGES AND ELECTROMYOGRAM ON VARIOUS REGIONS OF THE RENAL PELVIS