Volume and length of excised ureteral segments were measured for normal, hypo-used, and hyper-used dog ureters at increasing and decreasing pressures. Incrementally increasing pressure tended to produce substantial incremental increases in both length and volume in all subjects and use-types, although considerable differences between subjects were evident. These pressure effects were specific to the use-types, at least in the case of volume. The two non-normal use-types, hypo-use and hyper-use, were accompanied by statistically significant differential effects on length and on volume as compared to normal use-types.Hysteresis effects-specifically, tendencies for length to decrease and for volume to increase in the pressure readings during ascending pressures as compared with the readings during descending pressures-would appear to be common in all use-types. However, a statistically significant differential effect was found only in the case of hyper-use. In any case, these effects appeared to be specific to pressure level as well as use-type.

Keywords:
Smooth muscle, Hysteresis, Ureteral volume, Ureteral length, Obstruction, Increase flow, Intraluminal pressure
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© 1971 S. Karger AG, Basel
1971
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