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Type: Journal article
Title: Validation of a novel luminal flow velocimeter with video fluoroscopy and manometry in the human esophagus
Author: Andrews, J.
Nathan, H.
Malbert, C.
Verhagen, M.
Gabb, M.
Hebbard, G.
Kilpatrick, S.
MacDonald, S.
Rayner, C.
Doran, S.
Omari, T.
O'Young, E.
Frisby, C.
Fraser, R.
Schoeman, M.
Horowitz, M.
Dent, J.
Citation: The American journal of physiology, 1999; 276(4):G886-G894
Issue Date: 1999
ISSN: 0193-1857
Statement of
J. M. Andrews, H. Nathan, C. H. Malbert, M. A. M. T. Verhagen, M. Gabb, G. S. Hebbard, D. Kilpatrick, S. MacDonald, C. K. Rayner, S. Doran, T. Omari, E. O'Young, C. Frisby, R. J. Fraser, M. Schoeman, M. Horowitz, and J. Dent
Abstract: There is currently no ideal method for concurrently assessing intraluminal pressures and flows in humans with high temporal resolution. We have developed and assessed the performance of a novel fiber-optic laser-Doppler velocimeter, mounted in a multichannel manometric assembly. Velocimeter recordings were compared with concurrent fluoroscopy and manometry following 50 barium swallows in healthy subjects. During these swallows, the velocimeter sensor was situated in either the proximal (24 swallows) or the distal (26 swallows) esophagus. It signaled intraluminal flow following 46 of 50 swallows. A greater mean number of deflections were recorded in the distal compared with the proximal esophagus (4. 3 vs. 2.4, P = 0.001). The maximal flow velocity recorded did not differ between the proximal and distal esophagus (76.7 vs. 73.8 mm/s). No velocimeter signals commenced after fluoroscopic lumen occlusion. The velocimeter signals were closely temporally related to fluoroscopic barium flow. Upward catheter movement on swallowing sometimes appeared to cause a velocimeter signal. Manometrically "normal" swallows were no different from "abnormal" swallows in the number and velocity of deflections recorded by the velocimeter. This novel instrument measures intraluminal flow velocity and pressures concurrently, thus enabling direct study of pressure-flow relationships. Flow patterns differed between the proximal and distal esophagus.
Keywords: intraluminal flow; pressure-flow relationships; laser-Doppler flow measurement
RMID: 0030005119
DOI: 10.1152/ajpgi.1999.276.4.g886
Appears in Collections:Medicine publications

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