The Passive Properties of the Urinary Bladder in the Collection Phase

Mastrigt, Ron van; Coolsaet, B.L.R.A.; Duyl, W. A. van

doi:10.1159/000280170

Cited by 33 publications

(46 citation statements)

References 1 publication

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“…Es(e ) = Eo e~ (16) (which was found to be the case in urinary bladderwall material ( VAN MASTRIGT et al, 1978)), substitute this together with eqn. 13 in eqn.…”

Section: Received 3rd June 1980mentioning

confidence: 99%

“…Although both Et and t/depend on strain, it has been shown ( VAN MASTRIGT et aL, 1978) that the relaxation time of the element does not depend on strain. For the model, this means that the relaxation parameter:…”

Section: Received 3rd June 1980mentioning

confidence: 99%

“…We will therefore call a(tl~) the 'factor' of the relaxation ~o(eo) following a 'physical step' straining. ' and 'tangent" moduli In the previously published viscoelastic model ( VAN MASTRIGT et al, 1978), the elastic modulus was defined in a different way, as the 'secant modulus' Ed~), see Fig. 3.…”

Section: Received 3rd June 1980mentioning

confidence: 99%

“…THE PASSIVE properties of the urinary bladder in the collection phase can adequately be described in terms of a non-linear viscoelastic model ( VAN MASTRIGT et al, 1978). The parameters of this model were determined mainly by applying stepwise straining to strips of bladder-wall material ( VAN MASTRIGT, 1977b).…”

Section: Introductionmentioning

confidence: 99%

“…The results of stepwise cystometry must therefore be corrected for the lower strain rates involved. Since a simple correction formula based on a linear viscoelastic model ( VAN MASTRIGT, 1977b) did not adequately describe viscoelastic responses at lower strain rates (VAN MASTRIGT et al, 1978) we decided to carry out a separate investigation of the strain-rate dependence of the viscoelastic response of the urinary bladder wall.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dependence of the viscoelastic response of the urinary bladder wall on strain rate

Mastrigt

Nagtegaal

1981

Med. Biol. Eng. Comput.

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“…Es(e ) = Eo e~ (16) (which was found to be the case in urinary bladderwall material ( VAN MASTRIGT et al, 1978)), substitute this together with eqn. 13 in eqn.…”

Section: Received 3rd June 1980mentioning

confidence: 99%

Section: Received 3rd June 1980mentioning

confidence: 99%

Section: Received 3rd June 1980mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dependence of the viscoelastic response of the urinary bladder wall on strain rate

Mastrigt

Nagtegaal

1981

Med. Biol. Eng. Comput.

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Non-invasive measurement of bladder pressure using an external catheter

Pel

Mastrigt

1999

Neurourol. Urodyn.

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Previous studies showed that, on the basis of a combination of maximum flow rate and isovolumetric bladder pressure, objectively diagnosing infravesical obstruction is possible. In this study, we validated a newly developed external catheter to measure non‐invasively this pressure, which avoids the risk of damaging or infecting the urethral and bladder wall as occurs with invasive urodynamics. To evaluate the external catheter, we simultaneously recorded the internal bladder pressure signal (measured invasively) and the external pressure signal (measured non‐invasively) in 40 non‐obstructed and obstructed patients. Additionally, we tested whether the external pressure depended on bladder volume in five healthy volunteers. The simultaneously measured internal bladder pressure and external pressure showed good agreement in the non‐obstructed patients. There was less agreement in the obstructed group. Nevertheless, the external pressure in these patients was significantly higher than in the non‐obstructed patients. The maximum external pressure depended significantly on the bladder volume in all volunteers. We concluded that isovolumetric bladder pressure can be measured non‐invasively with the external catheter. In non‐obstructed patients, this pressure accurately represents the internal bladder pressure. We think that it is possible to distinguish between obstructed patients and patients with a weak detrusor by combining the non‐invasively measured isovolumetric bladder pressure with a separately measured maximum flow rate. Neurourol. Urodynam. 18:455–475, 1999. © 1999 Wiley‐Liss, Inc.

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Bladder compliance and detrusor activity during the collection phase

Coolsaet

1985

Neurourology and Urodynamics

122

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The bladder wall is composed of passive (collagen, elaftin) and active (smooth muscle) elements. Some of the smooth muscle cells have properties of "pacemakers" in that they show spontaneous activity at rest. Moreover, when these cells are stretched, the resting membrane potentials decrease and the frequency of action potentials increase. It has been further demonstrated that both in vitro muscle strips and in vivo bladder preparations show spontaneous activity which may generate both tonic and phasic changes in bladder wall forces. The rate and duration of stretch both affect the force that the cell can generate. Thus, the filling pressureivolume curve obtained by systometry represents an interaction between the active and passive elements of the bladder wall. Since the cystornetric curve is time dependent, it is impossible to compare cystometrograms unless this time dependency is taken into account. With these principles in mind it is possible to standardize the terminology for characterizing detrusor activity during the collection phase as outlined in this report.

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The Passive Properties of the Urinary Bladder in the Collection Phase

Cited by 33 publications

References 1 publication

Dependence of the viscoelastic response of the urinary bladder wall on strain rate

Dependence of the viscoelastic response of the urinary bladder wall on strain rate

Non-invasive measurement of bladder pressure using an external catheter

Bladder compliance and detrusor activity during the collection phase

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