Document Detail

Urodynamic verification of noninvasive back-pressure recordings from the urinary bladder.
MedLine Citation:
PMID:  9891999     Owner:  NLM     Status:  MEDLINE    
Obstructive voiding is best evaluated with urodynamics, especially simultaneous measurement of bladder-pressure and urine flow rates. As an alternative to catheterization for urodynamics, noninvasive back-pressure methods using an external condom system have been introduced. This device uses one side tube in the condom for pressure recording and an outlet tube that is clamped for short periods of time during voiding. However, there have been problems with accurate back-pressure recording, including leaking, clamping techniques, hydrostatic pressures associated with pressure recording below the level of the symphysis pubis, and assessment of back pressures in relation to bladder and detrusor pressures. To address these issues, we have modified the condom for passing a catheter into the urethra for simultaneous direct bladder and back-pressure recording. The clamping device on the outlet tube also has been modified to produce back flushing of urine in addition to clamping. Hydrostatic issues have been addressed by making pressure recordings at the level of the symphysis pubis. Seven patients with obstructive symptoms were evaluated using these new devices. Back pressures were not statistically different than detrusor pressures recorded with a urethral catheter. Thus, the modifications have improved back-pressure recording techniques. The use of noninvasive back-pressure recording may be an important adjunct in the evaluation of obstructive uropathy.
J S Walter; G Andros; S Stokes; J S Wheeler; M Damaser; J Sacks; I Kadri; R Walter
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Techniques in urology     Volume:  4     ISSN:  1079-3259     ISO Abbreviation:  Tech Urol     Publication Date:  1998 Dec 
Date Detail:
Created Date:  1999-03-24     Completed Date:  1999-03-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9508161     Medline TA:  Tech Urol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  185-91     Citation Subset:  IM    
Rehabilitation Research and Development Center, Hines Veterans Hospital, Illinois 60141, USA.
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MeSH Terms
Hydrostatic Pressure
Muscle Contraction
Muscle, Smooth / physiopathology
Prostatic Hyperplasia / complications,  physiopathology
Urinary Bladder / physiopathology*
Urinary Bladder Neck Obstruction / etiology,  physiopathology

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