THE TIME-DISTANCE DIAGRAM - A NEW METHOD TO ANALYZE URETERAL PERISTALSIS BY CINERADIOGRAPHY

  • 1 January 1980
    • journal article
    • research article
    • Vol. 18  (3) , 207-208
Abstract
Ureteral peristalis was assessed in dogs by cineradiography and the films were analyzed in a single frame follow-up by measuring the position of bolus front and rear end in relation to the bladder and the kidney. The data were plotted as function of time in a time-distance diagram. The bolus rear end which is the active contractile ring, as proven by electromyography, travels with constant velocity. The bolus front shows remarkably changes in propagation velocity which can be explained by differences in wall forces that resist the opening of the ureteral lumen. The time-distance diagram describes precisely the constantly changing dynamics of ureteral peristalsis along the entire ureter.

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