Discriminating movements of liquid and gas in the rabbit colon with impedance manometry

Rosli, Reizal Mohd; Leibbrandt, Richard; Wiklendt, Lukasz; Costa, M.; Wattchow, David; Spencer, Nick J.; Brookes, Simon J.; Omari, Taher; Dinning, Phil G.

doi:10.1111/nmo.13263

Cited by 4 publications

(1 citation statement)

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“…A set of studies have been performed with high‐resolution manometry (HRM) and HRIM catheters on isolated segments of colon from humans and rabbits to gain insight on the motor activity of the colon . The presence of myogenic contractions “ripples” was detected by means of a combination of pressure and diameter spatiotemporal maps (DPMaps), but the impedance measurements from commercial HRIM catheters were not able to detect the subtle changes in luminal diameter due to these ripples.…”

Section: Introductionmentioning

confidence: 99%

Effect of electrode separation on high‐resolution impedance manometry catheters for ex vivo animal experiments

Ruiz-Vargas

Rosli

Wiklendt

et al. 2018

Neurogastroenterology Motil

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Background High‐resolution impedance manometry (HRIM) catheters are used for esophageal reflux and bolus transit studies. Usually, these catheters have electrodes spaced at 20 mm intervals that are used for measuring electrical impedance between the consecutive electrodes and pressure sensors with 10 mm separation. Electrical impedance is a distributed measurement between the electrodes, unlike the point measurement of pressure sensors. Thus, the electrode separations affect the overall spatiotemporal resolution of the measurement. Methods A 3D model of the gastrointestinal tract, in which bolus shape and size can be modified, was used to simulate the admittance signal response of an intraluminal impedance catheter with 10 and 20 mm electrode separation to study the distributed sensitivity in the lumen to gain insight on the impedance measurement. In addition, experiments on sections of rabbit proximal colon were conducted with two catheters with electrode separations of 10 and 20 mm to compare the experimental data with the simulated data. Key Results Reducing electrode spacing from 20 to 10 mm increased sensitivity to diameter change by a factor of ten. Admittance and diameter correlated strongly during a myogenic contraction with a Pearson's Correlation Coefficient of 0.86 for the custom catheter, in comparison with 0.56 for the commercial HRIM catheter. Conclusions Ten millimeter electrode separation has a better spatiotemporal resolution, and unlike 20 mm electrode separation is able to identify myogenic contractions. Based on the numerical and experimental data, closer electrode separation should be considered for improved spatial resolution.

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Section: Introductionmentioning

confidence: 99%