| Comparison of air-charged and water-filled urodynamic pressure measurement catheters. | |
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MedLine Citation:
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PMID: 21305591 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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AIMS: Catheter systems are utilized to measure pressure for diagnosis of voiding dysfunction. In a clinical setting, patient movement and urodynamic pumps introduce hydrostatic and motion artifacts into measurements. Therefore, complete characterization of a catheter system includes its response to artifacts as well its frequency response. The objective of this study was to compare the response of two disposable clinical catheter systems: water-filled and air-charged, to controlled pressure signals to assess their similarities and differences in pressure transduction. METHODS: We characterized frequency response using a transient step test, which exposed the catheters to a sudden change in pressure; and a sinusoidal frequency sweep test, which exposed the catheters to a sinusoidal pressure wave from 1 to 30 Hz. The response of the catheters to motion artifacts was tested using a vortex and the response to hydrostatic pressure changes was tested by moving the catheter tips to calibrated heights. RESULTS: Water-filled catheters acted as an underdamped system, resonating at 10.13 ± 1.03 Hz and attenuating signals at frequencies higher than 19 Hz. They demonstrated significant motion and hydrostatic artifacts. Air-charged catheters acted as an overdamped system and attenuated signals at frequencies higher than 3.02 ± 0.13 Hz. They demonstrated significantly less motion and hydrostatic artifacts than water-filled catheters. The transient step and frequency sweep tests gave comparable results. CONCLUSIONS: Air-charged and water-filled catheters respond to pressure changes in dramatically different ways. Knowledge of the characteristics of the pressure-measuring system is essential to finding the best match for a specific application. |
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Authors:
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M A Cooper; P C Fletter; P J Zaszczurynski; M S Damaser |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2011-02-08 |
Journal Detail:
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Title: Neurourology and urodynamics Volume: 30 ISSN: 1520-6777 ISO Abbreviation: Neurourol. Urodyn. Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-03-17 Completed Date: 2011-06-30 Revised Date: 2011-11-25 |
Medline Journal Info:
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Nlm Unique ID: 8303326 Medline TA: Neurourol Urodyn Country: United States |
Other Details:
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Languages: eng Pagination: 329-34 Citation Subset: IM |
Copyright Information:
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Copyright © 2011 Wiley-Liss, Inc. |
Affiliation:
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Advanced Platform Technology Center, Louis Stokes Veterans Affairs Medical Center, Cleveland, Ohio, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Air Artifacts Catheters* Disposable Equipment Equipment Design Hydrostatic Pressure Materials Testing Motion Reproducibility of Results Signal Processing, Computer-Assisted Transducers, Pressure Urinary Catheterization / instrumentation* Urodynamics* Water |
| Chemical | |
Reg. No./Substance:
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7732-18-5/Water |
| Comments/Corrections | |
Comment In:
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Neurourol Urodyn. 2011 Nov;30(8):1705; author reply 1706
[PMID:
21661040
]
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Erratum In:
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Neurourol Urodyn. 2011 Jun;30(5):786 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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