Document Detail

Ultrasound system to measure esophageal varix pressure: an in vitro validation study.
MedLine Citation:
PMID:  15626729     Owner:  NLM     Status:  MEDLINE    
We report our experience with an ultrasound system to measure esophageal varix pressure in an in vitro model. The ultrasound system consists of a 12.5 MHz frequency intraluminal ultrasound probe, a water infusion catheter, and a manometry catheter, all contained within a nondistensible latex bag. Esophagi and external jugular veins were harvested from five pigs. The vein and ultrasound system were placed inside the esophagus. One end of the vein was connected to a water reservoir to modulate its pressure; the other end was connected in two different ways to simulate hydrodynamic and hydrostatic flow conditions. The bag was inflated with water until vein occlusion was discernible on the ultrasound images. The influences of vein pressure, vein cross-sectional area and esophageal elasticity on the ultrasound measurement of vein pressure were assessed. A total of 108 trials were performed at nine different vein pressures. Complete vein occlusion occurred when the bag pressure was slightly greater (1.4 +/- 0.7 mmHg) than the vein pressure. For a vein pressure of 25 mmHg, the average occlusion and opening pressures were 27 +/- 0.2 and 25.7 +/- 0.3 mmHg, respectively (P < .05) suggesting that the vein opening pressure on the ultrasound images is more accurate than the vein closing pressure. In conclusion, the ultrasound technique can accurately measure intravariceal pressure in vitro. The bag pressure at the point of vein reopening is the best determinant of the vein pressure.
James L Puckett; Jianmin Liu; Vikas Bhalla; David Kravetz; Mary Lee Krinsky; Tarek Hassanein; Ravinder K Mittal
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.     Date:  2004-12-30
Journal Detail:
Title:  American journal of physiology. Gastrointestinal and liver physiology     Volume:  288     ISSN:  0193-1857     ISO Abbreviation:  Am. J. Physiol. Gastrointest. Liver Physiol.     Publication Date:  2005 May 
Date Detail:
Created Date:  2005-04-13     Completed Date:  2005-05-16     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  100901227     Medline TA:  Am J Physiol Gastrointest Liver Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  G914-9     Citation Subset:  IM    
Division of Gastroenterology 111D, Veterans Affairs Medical Center, University of California, San Diego, 3350 La Jolla Village Drive, San Diego, California 92161, USA.
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MeSH Terms
Esophageal and Gastric Varices / physiopathology*,  ultrasonography*
Esophagus / blood supply*
Manometry / instrumentation*
Transducers, Pressure
Grant Support

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