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Impedance spectroscopy measurements as a tool for distinguishing different luminal content during bolus transit studies

Intraluminal electrical impedance is a well‐known diagnostic tool used to study bolus movement in the human esophagus. However, it is use in the human colon it is hindered by the fact that the content cannot be controlled and may include liquid, gas, solid, or a mixture of these at any one time. This article investigates the use of complex impedance spectroscopy to study different luminal content (liquid and gas).