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New probe for the measurement of dynamic changes in the rectum
Author(s) -
Andersen I. S.,
Gregersen H.,
Buntzen S.,
Djurhuus J. C.,
Laurberg S.
Publication year - 2004
Publication title -
neurogastroenterology and motility
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.489
H-Index - 105
eISSN - 1365-2982
pISSN - 1350-1925
DOI - 10.1046/j.1365-2982.2003.00465.x
Subject(s) - in vivo , coefficient of variation , rectum , biomedical engineering , conical surface , materials science , lumen (anatomy) , nuclear medicine , mathematics , anatomy , medicine , biology , surgery , statistics , composite material , microbiology and biotechnology
Conventional mano‐volumetric techniques cannot measure changes in circumferential dimensions at several axial positions within a bowel segment. Our aims were to validate a new impedance planimetry probe for simultaneously measuring the cross‐sectional area (CSA) at five axial positions in vitro and in vivo in 10 anesthetized pigs. The day‐to‐day coefficient of variation (CV) for CSA measured by the probe in cylindrical tubes of known diameter was 0.8–9.5%. The mean from actual diameter deviation ranged from 2.3 to 6.7%. In a conical tube the day‐to‐day CV was 2.3–8% and mean percentage deviation −2.8 to 1.0. Interposed narrowing sections caused a total CV of 7–13%. In vivo studies revealed variations in CSA, associated with expulsion of flatus. It is concluded that impedance planimetry allows simultaneous measurement of CSA at several levels within the rectum. In vitro validity was acceptable and alterations in lumen diameter were identified in vivo.