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Poster 116
COMPARISON OF WATER AND AIR-CHARGED TRANSDUCER CATHETERS DURING VOIDING PRESSURE STUDIES

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Comparison of Water and Air-Charged Transducer Catheters During Voiding Pressure Studies
T. McKinney2, N. M. Shah1, V. Ciolfi3, C. McKinney2, E. Babin2
1OB/GYN, Drexel Univ. Coll. of Med., Philadelphia, PA 2Athena Women’s Inst. For Pelvic Health, Turnersville, NJ, 3Laborie Med. Technologies, Mississauga, Canada

Introduction

•Water-perfused (WP) catheters and Air-charged (AC) catheters during voiding pressure studies should work similarly within the bladder during the voiding phase of urodynamics.
•We believe that a single, dual functioning catheter, and the same experienced clinician throughout the study will provide analagous point pressures for the voiding pressure study in both AC and WP catheters when analyzed.

Objective

To demonstrate the reproducibility of AC versus WP catheters when measuring pressures during voiding pressure studies in urodynamics (UDS).

Methods

Female patients enrolled above the age of 21

Complaints of lower urinary tract symptoms and were recommended urodynamic studies for further evaluation of symptoms.

Commercially available AC catheter was utilized to form a dual catheter to simultaneously read water and air pressures within the bladder 1 cm apart

Water-filliing channel serves both as bladder filler and water pressure sensor to an external transducer on a Laborie urodynamics machine.

A comparative analysis was performed on the maximum peak pressures during the voiding pressure study (VPS).

Results

•Forty women with a mean age of 57 years were recruited
•N=30 as several patients were unable to void, catheter fell out, or water perfusion pressures stopped working.
•Significant correlations were observed between AC and WP catheter pressures during VPS at mas pressures as shown in Figures 1 and 2.
•Trendline equations comparing AC and WP measurements during VPS showed a high correlation (average R2=0.99)
•Visual impression of the two overlying measurement methods shows virtually identical tracings
•Voiding pressure portion of the CMG showed a high correlation

Conclusions

Both air charged catheters and water perfused catheters are comparable in their pressure readings during maximum pressure during  a voiding pressure study.

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