Direct Bladder Stimulation with Percutaneous Electrodes and Impedance Monitoring of Volume in an SCI Animal Model

Walter, James S.; Zaszczurynski, Paul; Cai, Wuying; Wheeler, John S.; Riedy, Lisa; Scarpine, V.

doi:10.1080/10790268.1995.11719386

Cited by 7 publications

(9 citation statements)

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“…This measuring method rests on the basic assumption that the detrusor shows di¡erent impedance behaviors at di¡erent stress conditions (i.e., the ¢lling volumes of the bladder). However, there was no acceptable certainty for correct analysis of the actual ¢lling status [Walter et al, 1995]. Similar restrictions apply to the implantation of expansion strips for bladder volumetry, as has been proposed by Dreher et al [1972].…”

Section: Discussionmentioning

confidence: 89%

“…These tissue reactions a¡ect the mechanical and electrical behavior qualities, so one must take into account the risk of generating inadequate data in the long run when using measuring systems of this kind [Koldewijn et al, 1994;Walter et al, 1997]. Continuous US volumetry by contrast, o¡ers signi¢cant advantages such as independence from morphological changes and tissue ¢brosis, extracellular liquid accumulation, or changes in the tissue blood circulation [Preussner, 1991;Walter et al, 1995;Ghoniem et al, 1997;Scheepe et al, 1998;Agnew et al, 1999;Bross et al, 1999]. Beside these advantages, this system presents hardly any disadvantages with respect to manageability, energy consumption, and fault liability.…”

Section: Discussionmentioning

confidence: 99%

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Urinary bladder volumetry by means of a single retrosymphysically implantable ultrasound unit

Seif¹,

Herberger

Cherwon

et al. 2004

Neurourology and Urodynamics

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In our animal model, the above-described US system proved tantamount with other external US measuring units and presented a precise and low-artefact system, allowing reliable measuring of the urinary volume with good chances of preserving these positive qualities over time. We expect that clinical application of this system may help to determine the optimal voiding time and thus to avoid bladder over-extension and damage to the urinary tract over time.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Urinary bladder volumetry by means of a single retrosymphysically implantable ultrasound unit

Seif¹,

Herberger

Cherwon

et al. 2004

Neurourology and Urodynamics

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“…21 Similar attempts to assess bladder volume relied upon invasive procedures to place electrodes within the bladder wall. 22,23 These methods produced data exhibiting a correlation between impedance (the inverse of conductance) and volume, which results from the thinning and elongation of the detrusor with increasing bladder volume.…”

Section: Discussionmentioning

confidence: 99%

Feasibility of fluid volume conductance to assess bladder volume

Gill

Fletter

Zaszczurynski

et al. 2007

Neurourology and Urodynamics

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The conductance method is sensitive to changes in both concentration and temperature of the intravesical solution, likely due to changes in solution conductivity. Clinical application of conductance for measurement of bladder volume will require real-time conductivity compensation for the dynamically varying properties of urine. However, improved sensitivity at high volumes is necessary before this method has the potential to provide real-time bladder volume measurement for use in ambulatory urodynamics.

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“…In der Praxis bedeutet dies, daß der maximal erreichbare Detrusorkontraktionsdruck gekoppelt ist am aktuellen Füllungs-grad der Harnblase [2,5,13]. Ferner wurde beobachtet, daß unmittelbar nach einer Überdehnung der Harnblase die Kontraktionskraft des Detrusors abnimmt [2].…”

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“…Basierend auf Angaben aus der Literatur [3,6,9,13] J.R. Scheepe · S. Bross · P. Braun · C. Seif · K. Becker · X.P. Nguyen · P. Alken · K.P.…”

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Volumetrie der Harnblase mittels implantierbaren Ultraschallsensoren

et al. 2000

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Experimental studies revealed that the contractile response of the urinary bladder to sacral anterior root stimulation depends on the actual bladder volume. Furthermore, no clinical relevant technique is available for continuous monitoring of the bladder wall distension respectively bladder volume in paraplegic patients. The presented study investigates the reliability of especially developed implantable ultrasound sensors as a sensoric system for continuous monitoring of the bladder volume. In six anaesthesized pigs two ultrasound sensors, one transmitter and one receiver, were implanted on the bladder wall at different locations (latero-lateral, dorsal-ventral, rostral-caudal). After closing the abdominal wall, the bladder was filled in 50 ml steps up to 250 ml. After each filling step the running time of the ultrasound signal was measured. In all experiments reproducible results and a high correlation of the measured running times with bladder volume were observed. The latero-lateral configuration of the sensors seemed to be most confidential. The presented study indicates that bladder volumetry with implantable ultrasound sensors is possible with minimal technical prerequisites. This promising technique for continuous bladder volumetry could play an important role in the development of an intelligent and autoadaptive neurostimulator of the urinary bladder in paraplegic patients.

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Direct Bladder Stimulation with Percutaneous Electrodes and Impedance Monitoring of Volume in an SCI Animal Model

Cited by 7 publications

References 0 publications

Urinary bladder volumetry by means of a single retrosymphysically implantable ultrasound unit

Urinary bladder volumetry by means of a single retrosymphysically implantable ultrasound unit

Feasibility of fluid volume conductance to assess bladder volume

Volumetrie der Harnblase mittels implantierbaren Ultraschallsensoren

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