title: Investigation of urine transport in the ureter of the pig by x-ray videodensitometry. II. The effect of an increasing obstruction on velocity, rhythm, and efficiency of the contraction waves.
abstract: The effect on an increasing acute obstruction on the motility of the ureter was analyzed by means of X-ray videodensitometry. The mean wave velocity decreases and the efficiency of the individual contraction is reduced. The lumen of the ureter is no longer closed completely and an increasing fraction of the urine bolus flows backward. The regurgitation can be seen cineradiographically and assessed semiquantitatively by densitometry.
mesh_terms: D015502:Absorptiometry, Photon; D000818:Animals; D009119:Muscle Contraction; D013552:Swine; D014513:Ureter / Q000502:physiology*; D014517:Ureteral Obstruction / Q000503:physiopathology*; D014556:Urine