1999
DOI: 10.1002/(sici)1520-6777(1999)18:5<521::aid-nau15>3.0.co;2-0
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The flow regimes and the pressure-flow relationship in the canine urethra

Abstract: Classical fluid dynamics predicts that the pressure difference Δp between any two points along a fully developed, viscous flow stream is linearly proportional to the flow rate Q (the Poiseuille relation). However, the passive urethral resistance relationship (PURR) widely used in modern urodynamics describes the pressure difference Δp between two points along the urethra as linearly proportional to the flow rate squared (Q2). It is our hypothesis that this functional dependence may have its origins in the deve… Show more

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Cited by 5 publications
(4 citation statements)
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“…In vitro and in vivo characterization of urethrae from animal models has been performed by different authors (Lecamwasam et al . ; Marti et al . ; Lalla et al .…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…In vitro and in vivo characterization of urethrae from animal models has been performed by different authors (Lecamwasam et al . ; Marti et al . ; Lalla et al .…”
Section: Introductionmentioning
confidence: 99%
“…Remarks in the literature pertaining to the evaluation of mechanical properties of animal and human urethra are limited (Abramowitch et al 2009). In vitro and in vivo characterization of urethrae from animal models has been performed by different authors (Lecamwasam et al 1999;Marti et al 2006;Lalla et al 2007;Feng et al 2010;Haworth et al 2011;Joller et al 2012). However, these studies do not always discuss similarities with humans and do not take into account a combination of tissue and structural tests, without providing a throughout investigation.…”
Section: Introductionmentioning
confidence: 99%
“…The hydrodynamic aspect of modeling the lower urinary tract has received little theoretical attention. In this connection, we should mention paper [92] in which the discussion starts out from basic (but probably little known among physiologists) ideas of flow development in pipes and ends with the application of these ideas to experiments on a canine urethra separated surgically. It was found that the urethral flow is most probably laminar (the peak Reynolds numbers do not exceed the critical value) FLUID DYNAMICS Vol.…”
Section: Deformation Of the Bladder And The Urethramentioning
confidence: 99%
“…To this day, this study provides the most relevant mechanical data. Other authors investigated smaller animals, such as rats, rabbits or dogs (Joller et al 2012;Lalla and Danielsen 2007;Haworth et al 2011;Feng et al 2010;Lecamwasam et al 1999).…”
Section: Introductionmentioning
confidence: 99%