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Conversion of urodynamic pressures measured simultaneously by air‐charged and water‐filled catheter systems
Author(s) -
Awada Hassan K.,
Fletter Paul C.,
Zaszczurynski Paul J.,
Cooper Mitchell A.,
Damaser Margot S.
Publication year - 2015
Publication title -
neurourology and urodynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 90
eISSN - 1520-6777
pISSN - 0733-2467
DOI - 10.1002/nau.22633
Subject(s) - signal (programming language) , leak , amplitude , pressure sensor , catheter , biomedical engineering , pressure measurement , medicine , acoustics , anesthesia , surgery , physics , computer science , optics , thermodynamics , programming language
Aims The objective of this study was to compare the simultaneous responses of water‐filled (WFC) and air‐charged (ACC) catheters during simulated urodynamic pressures and develop an algorithm to convert peak pressures measured using an ACC to those measured by a WFC. Methods Examples of cough leak point pressure and valsalva leak point pressure data (n = 4) were obtained from the literature, digitized, and modified in amplitude and duration to create a set of simulated data that ranged in amplitude from 15 to 220 cm H 2 O (n = 25) and duration from 0.1 to 3.0 sec (n = 25) for each original signal. Simulated pressure signals were recorded simultaneously by WFCs, ACCs, and a reference transducer in a specially designed pressure chamber. Peak pressure and time to peak pressure were calculated for each simulated pressure signal and were used to develop an algorithm to convert peak pressures recorded with ACCs to corresponding peak pressures recorded with WFCs. The algorithm was validated with additional simulated urodynamic pressure signals and additional catheters that had not been utilized to develop the algorithm. Results ACCs significantly underestimated peak pressures of more rapidly changing pressures, as in coughs, compared to those measured by WFCs. The algorithm corrected 90% of peak pressures measured by ACCs to within 5% of those measured by WFCs when simultaneously exposed to the same pressure signals. Conclusions The developed algorithm can be used to convert rapidly changing urodynamic pressures, such as cough leak point pressure, obtained using ACC systems to corresponding values expected from WFC systems. Neurourol. Urodynam. 34:507–512, 2015 . © 2014 Wiley Periodicals, Inc.