Numerical investigations of intraluminal impedance

The measurement of the electrical impedance inside the esophagus provides information about its status, and is used in the study of the gastroesophageal reflux. This paper presents numerical modeling of the forward problem of the catheter inside the esophagus. The results of the numerical solution for a simple geometry is compared against solution formulated from Green's function approach. This paper also presents investigation of the effect of the esophagus status on the impedance, and the correlation between various factors that affect the impedance. The results of this paper provides a way of relating the esophagus condition to the impedance waveforms as well as in the interpretation of the resulting impedance signals.