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Pyeloureteral dynamics—Renal pelvis pressure‐flow relationship in pigs
Author(s) -
Mortensen J.,
Djurhuus J. C.
Publication year - 1983
Publication title -
neurourology and urodynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 90
eISSN - 1520-6777
pISSN - 0733-2467
DOI - 10.1002/nau.1930020211
Subject(s) - ureter , medicine , peristalsis , perfusion , renal pelvis , pelvis , bolus (digestion) , anatomy , urology , cardiology
Intrapelvic pressure in relation to Row was studied in the normal pyeloureter of the pig at progressing flow rates from 0 to 20 ml per minute. The mean pelvic pressure; before perfusion was started, was 6.1 cm H 2 O, increasing to 19.4 cm H 2 O at the highest perfusion rate. A significant increment in pressure occurred at a perfusion rate between 2 and 4 ml per minute. Thereafter, the mean pressure rise was linear with a correlation coefficient of 0.987 and an inclination of 0.27 cm H 2 O per ml. The study shows three phases of urine transport. At flow rates from 0 to 2 ml per minute, transport occurs at low pressure with a low resistance to flow through ureter. Between 2 ml and 4 ml per minute, a significant increase in intrapelvic pressure implicates an alteration of the peristaltic transport mechanism. It is presumed that the pressure increase is due to increased resistance in the ureter, probably caused by an impediment to passive filling. This impediment is probably due to the previous ureteral contraction, limiting the expansion of the fluid bolus. Above 4 ml per minute, transport takes place as a continuous flow through the ureter, which functions as a tube.