title: The influence of pyeloureteral peristalsis on pelvic pressure during increase in flow rate.
abstract: Thirty-nine normal pig pyeloureters were perfused with 0, 2, 4, 6, 8, 10 and 20 ml/min during continuous measurement of the pelvic pressure. A phasic pressure response was identified with the highest pressure increase between 2 and 4 ml/min. Two groups were analyzed. One consisting of the 10 pyeloureters with the highest pressure increase and the other of the 10 pyeloureters with the lowest pressure increase to a perfusion rate of 4 ml/min. The peristaltic frequency was significantly higher (about 6/min) in the high pressure group than in the low pressure group (about 3.5/min). It is concluded that a high peristaltic frequency is at least partly responsible for the high pressure response to increasing flow because the peristaltic contraction ring opposes the filling flow through ureter.
authors.affiliation: Institute of Experimental Clinical Research, University of Aarhus, Denmark.
authors.forename: J
authors.initials: J
authors.lastname: Mortensen
authors.forename: J
authors.initials: J
authors.lastname: Frøkiaer
authors.forename: H P
authors.initials: HP
authors.lastname: Tofft
authors.forename: J C
authors.initials: JC
authors.lastname: Djurhuus
mesh_terms: D000818:Animals; D007682:Kidney Pelvis / Q000502:physiology*; D009119:Muscle Contraction; D010388:Pelvis / Q000502:physiology; D011312:Pressure; D013552:Swine; D014513:Ureter / Q000502:physiology*; D014563:Urodynamics