Document Detail

Development and testing of a vaginal pressure sensor to measure intra-abdominal pressure in women.
MedLine Citation:
PMID:  19693948     Owner:  NLM     Status:  MEDLINE    
AIMS: Elevated intra-abdominal pressure (IAP) may be a potentially modifiable risk factor for pelvic floor disorders. However, limited evidence exists due to the lack of instruments suitable to measure abdominal pressures in real world settings. The aim of this study was to develop and test a vaginal sensor prototype to measure intra-abdominal pressure in women.
METHODS: We developed a non-directional vaginal sensor by housing pressure-sensing circuit boards in 1.2 x 3 cm radially symmetric silicon capsules. We characterized the response in a standardized pressure chamber. Eight women wore a sensor intra-vaginally while undergoing filling cystometry. We compared peak pressures during coughing, valsalva, squatting, and jumping to those obtained using a #10 French rectal balloon urodynamics catheter. We calculated Pearson's correlation coefficients between rectal and vaginal sensors for each event.
RESULTS: The vaginal sensors exhibited linear responses during initial bench testing. Each transducer correlated well with the rectal balloon catheter during coughing, valsalva, and squatting (r = 0.97, 0.94, and 0.97, respectively). However, the rectal balloon catheter recorded higher peak and lower, often negative, trough pressures during jumping. The vaginal sensor showed no such artifact.
CONCLUSIONS: This vaginal pressure sensor can be used as a surrogate for measuring intra-abdominal pressure in women without advanced prolapse. By measuring pressure at the physiological source, the vaginal sensor is less prone to extraneous noise and error than current transducers. Using this prototype, we will next develop a remote wireless version to capture a range of abdominal pressures experienced outside of the laboratory setting.
Evan M Rosenbluth; Paul J Johnson; Robert W Hitchcock; Ingrid E Nygaard
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article    
Journal Detail:
Title:  Neurourology and urodynamics     Volume:  29     ISSN:  1520-6777     ISO Abbreviation:  Neurourol. Urodyn.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-30     Completed Date:  2010-11-15     Revised Date:  2013-08-28    
Medline Journal Info:
Nlm Unique ID:  8303326     Medline TA:  Neurourol Urodyn     Country:  United States    
Other Details:
Languages:  eng     Pagination:  532-5     Citation Subset:  IM    
Copyright Information:
(c) 2009 Wiley-Liss, Inc.
Department of Obstetrics and Gynecology, University of Utah School of Medicine, Salt Lake City, UT 84132-2101, USA.
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MeSH Terms
Abdomen / physiology*
Equipment Design
Equipment and Supplies
Linear Models
Rectum / physiology
Vagina / physiology*
Valsalva Maneuver
Grant Support

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

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