liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Linköping University, Department of Biomedical Engineering, Physiological Measurements. Linköping University, The Institute of Technology.
1990 (English)In: Neurourology and Urodynamics, ISSN 0733-2467, E-ISSN 1520-6777, Vol. 9, no 2, 123-138 p.Article in journal (Refereed) Published
Abstract [en]

The flow in the urethra is controlled by an elastic constriction, the flow-controlling zone. The distensibility of this zone is described by the pressure/area relation, which gives the static pressure as a function of the cross-sectional area at the flow-controlling zone. The pressure/area relation can be calculated from the pressure/flow relation, which is estimated from the pressure/flow plot obtained at a urodynamic examination. In this study the urethral pressure/flow and pressure/area relations were estimated for 21 randomly selected men (62–75 years old) without voiding problems.

Nineteen of 21 persons in this group had pressure/flow relations with a low slope. This corresponds to a low slope in the pressure/area relation indicating high distensibility of the flow-controlling zone, which for 18 persons was estimated to be distended to areas larger than 10 mm2 during micturition. Twenty persons had a minimal urethral opening pressure below 55 cm H2O. The estimated pressure/area relation was linear in 59% of the micturitions, indicating that the flow-controlling zone could have been distended to a larger cross-sectional area, if the bladder had achieved a higher pressure. The 10th–90th percentiles for maximum flow and detrusor pressure at maximum flow were 7.2–24.3 ml/s and 24–76 cm H2O, respectively. Four persons had low flow and low pressure, indicating diminished detrusor contractility with age. Twenty-four percent of the persons had unstable bladder contractions with a pressure rise < 15cm H2O and 19% with a pressure rise < 15cm H2O.

Place, publisher, year, edition, pages
1990. Vol. 9, no 2, 123-138 p.
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:liu:diva-117008DOI: 10.1002/nau.1930090205OAI: diva2:802001
Available from: 2015-04-10 Created: 2015-04-10 Last updated: 2015-04-22

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Ask, Per
By organisation
Physiological MeasurementsThe Institute of Technology
In the same journal
Neurourology and Urodynamics
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 98 hits
ReferencesLink to record
Permanent link

Direct link