Principles of urodynamics pressure measurement and its implication to female continence function

Kyu Jung Kim; Catalin D. Jurnalov; Deborah J. Lightner; Maurice J. Webb; Raymond A. Lee; Kai Nan An

doi:10.1016/S0021-9290(98)00093-1

Principles of urodynamics pressure measurement and its implication to female continence function

Kyu Jung Kim, Catalin D. Jurnalov, Deborah J. Lightner, Maurice J. Webb, Raymond A. Lee, Kai Nan An

Obstetrics & Gynecology

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Urodynamic pressure measurements using catheters have been widely used among clinicians. More often objective interpretation of urodynamic pressure measurements requires fundamental understanding of pressure measurement techniques due to many measurement artifacts. In this study we developed a simplified compound thick-walled cylinder model to investigate the mechanical nature of urodynamic pressure measurement as well as pressure transmission. Efficacy of collagen implantation was also explored. Lame's formulation was used to find analytical solutions. Pressure transmission can be related to catheter caliber and the compressibility of the urethral tissue (poisson ratio) in a simple mathematical form. The theoretical pressure transmission ratio will be 133% with the additional incompressibility assumption, reflecting the passive structural transmission of intraabdominal pressure increase. The relationship between the pressure measurement error and the catheter caliber was found to be linear (r² = 0.94 ± 0.04) and two or more pressure measurements need to be used to find the uninstrumented pressure. It was predicted that collagen implantation treatment might improve the pressure transmission ratio maximally by 33%.

Original language	English (US)
Pages (from-to)	861-865
Number of pages	5
Journal	Journal of Biomechanics
Volume	31
Issue number	9
DOIs	https://doi.org/10.1016/S0021-9290(98)00093-1
State	Published - Sep 1 1998

Keywords

Catheter
Female urethra
Urinary incontinence
Urodynamics

ASJC Scopus subject areas

Biophysics
Orthopedics and Sports Medicine
Biomedical Engineering
Rehabilitation

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title = "Principles of urodynamics pressure measurement and its implication to female continence function",

abstract = "Urodynamic pressure measurements using catheters have been widely used among clinicians. More often objective interpretation of urodynamic pressure measurements requires fundamental understanding of pressure measurement techniques due to many measurement artifacts. In this study we developed a simplified compound thick-walled cylinder model to investigate the mechanical nature of urodynamic pressure measurement as well as pressure transmission. Efficacy of collagen implantation was also explored. Lame's formulation was used to find analytical solutions. Pressure transmission can be related to catheter caliber and the compressibility of the urethral tissue (poisson ratio) in a simple mathematical form. The theoretical pressure transmission ratio will be 133% with the additional incompressibility assumption, reflecting the passive structural transmission of intraabdominal pressure increase. The relationship between the pressure measurement error and the catheter caliber was found to be linear (r2 = 0.94 ± 0.04) and two or more pressure measurements need to be used to find the uninstrumented pressure. It was predicted that collagen implantation treatment might improve the pressure transmission ratio maximally by 33%.",

keywords = "Catheter, Female urethra, Urinary incontinence, Urodynamics",

author = "Kim, {Kyu Jung} and Jurnalov, {Catalin D.} and Lightner, {Deborah J.} and Webb, {Maurice J.} and Lee, {Raymond A.} and An, {Kai Nan}",

note = "Funding Information: We gratefully acknowledge the support of NIH HD 07447 and Mayo Foundation in this research. ",

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AU - Kim, Kyu Jung

AU - Jurnalov, Catalin D.

AU - Lightner, Deborah J.

AU - Webb, Maurice J.

AU - Lee, Raymond A.

AU - An, Kai Nan

N1 - Funding Information: We gratefully acknowledge the support of NIH HD 07447 and Mayo Foundation in this research.

PY - 1998/9/1

Y1 - 1998/9/1

N2 - Urodynamic pressure measurements using catheters have been widely used among clinicians. More often objective interpretation of urodynamic pressure measurements requires fundamental understanding of pressure measurement techniques due to many measurement artifacts. In this study we developed a simplified compound thick-walled cylinder model to investigate the mechanical nature of urodynamic pressure measurement as well as pressure transmission. Efficacy of collagen implantation was also explored. Lame's formulation was used to find analytical solutions. Pressure transmission can be related to catheter caliber and the compressibility of the urethral tissue (poisson ratio) in a simple mathematical form. The theoretical pressure transmission ratio will be 133% with the additional incompressibility assumption, reflecting the passive structural transmission of intraabdominal pressure increase. The relationship between the pressure measurement error and the catheter caliber was found to be linear (r2 = 0.94 ± 0.04) and two or more pressure measurements need to be used to find the uninstrumented pressure. It was predicted that collagen implantation treatment might improve the pressure transmission ratio maximally by 33%.

AB - Urodynamic pressure measurements using catheters have been widely used among clinicians. More often objective interpretation of urodynamic pressure measurements requires fundamental understanding of pressure measurement techniques due to many measurement artifacts. In this study we developed a simplified compound thick-walled cylinder model to investigate the mechanical nature of urodynamic pressure measurement as well as pressure transmission. Efficacy of collagen implantation was also explored. Lame's formulation was used to find analytical solutions. Pressure transmission can be related to catheter caliber and the compressibility of the urethral tissue (poisson ratio) in a simple mathematical form. The theoretical pressure transmission ratio will be 133% with the additional incompressibility assumption, reflecting the passive structural transmission of intraabdominal pressure increase. The relationship between the pressure measurement error and the catheter caliber was found to be linear (r2 = 0.94 ± 0.04) and two or more pressure measurements need to be used to find the uninstrumented pressure. It was predicted that collagen implantation treatment might improve the pressure transmission ratio maximally by 33%.

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KW - Urinary incontinence

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Principles of urodynamics pressure measurement and its implication to female continence function

Abstract

Keywords

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