INVESTIGATION OF URINE TRANSPORT IN URETER OF PIG BY X-RAY VIDEODENSITOMETRY .1. EFFECT OF INCREASING DIURESIS ON VELOCITY AND RHYTHM OF CONTRACTIONS - RELATIONSHIP BETWEEN PRESSURE WAVE AND URINE BOLUS

  • 1 January 1976
    • journal article
    • research article
    • Vol. 13  (6) , 404-409
Abstract
The flow rate is the decisive parameter of ureteric function. The frequency and the velocity of the contraction waves can be measured by X-ray videodensitometry without having to touch the ureter. The relationship between flow rate (ml/min) and wave velocity (mm/s) is investigated in the pig ureter. The wave velocity is a quadratic function of the perfusion; the graphic representation of this function corresponds to a parabolic curve. The relationship between the bolus and the pressure wave is analyzed and the time lag between the rear end of the bolus and the pressure peak is independent of the wave velocity. The theoretical ureter model of Weinberg is experimentally confirmed by simultaneous manometry and videodensitometry.

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