Postoperative Recovery of Ureteral Peristalsis

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The right ureters of 5 adult dogs were 1) cut open longitudinally for 1cm and sutured lengthwise, 2) cut 3-4cm lengthwise and sutured lengthwise, 3) cut 1cm and sutured transversely and 4) cut 3-4cm and sutured transversely. Electroureterograms above and below the suture were taken for 5 hours after the operation. The results can be summarised as follows: The discharges starting from the ureteropelvic junction began to pass over the suture in 30 to 100 minutes after the operation in most cases, then gradually increased and attained a nearly constant rate in 120 minutes. The earliest discharge passing over the suture occurred in the short-incision lengthwise-sutured cases in 30 to 45 minutes after the operation. Next, in 30 to 100 minutes in the long-incision lengthwise-sutured cases, and finally in 60 to 90 minutes in the short-incision transverse-sutured cases. There were only little differences among them except in the long-incision transverse-sutured cases, in which no discharge was observed for 5 hours after the operation. From the findings obtained, it has been shown that normal discharge function of the ureter was least inhibited in the short-incision lengthwisesutured cases, next least inhibited in the long-incision lengthwise-sutured cases and short-incision transverse-sutured cases in close succession, and most inhibited in the long-incision transverse-sutured cases.

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