Document Detail

Comparison of air-charged and water-filled urodynamic pressure measurement catheters.
MedLine Citation:
PMID:  21305591     Owner:  NLM     Status:  MEDLINE    
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.
M A Cooper; P C Fletter; P J Zaszczurynski; M S Damaser
Publication Detail:
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:
Title:  Neurourology and urodynamics     Volume:  30     ISSN:  1520-6777     ISO Abbreviation:  Neurourol. Urodyn.     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-03-17     Completed Date:  2011-06-30     Revised Date:  2011-11-25    
Medline Journal Info:
Nlm Unique ID:  8303326     Medline TA:  Neurourol Urodyn     Country:  United States    
Other Details:
Languages:  eng     Pagination:  329-34     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Wiley-Liss, Inc.
Advanced Platform Technology Center, Louis Stokes Veterans Affairs Medical Center, Cleveland, Ohio, USA.
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MeSH Terms
Disposable Equipment
Equipment Design
Hydrostatic Pressure
Materials Testing
Reproducibility of Results
Signal Processing, Computer-Assisted
Transducers, Pressure
Urinary Catheterization / instrumentation*
Reg. No./Substance:
Comment In:
Neurourol Urodyn. 2011 Nov;30(8):1705; author reply 1706   [PMID:  21661040 ]
Erratum In:
Neurourol Urodyn. 2011 Jun;30(5):786

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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