Multichannel intraluminal impedance

Detects bolus movement within the esophagus and can measure changes of resistance as a bolus passes through multiple pairs of metallic rings mounted on an intraluminal catheter.

Liquid bolus has less resistance and higher conductivity than an empty esophageal lumen and lowers the impedance as it traverses the distance between the ring pairs on the catheter.

Gas swallowed or belched has poor electrical conductivity and raises the impedance, as it passes through the measuring device.

This technique may determine the direction of fluid bolus or gas movement.

This technique may detect GERD, regardless of the nature esophageal pH, as well as the presence of air swallowing or belching.

When combined with manometry it can record intraesophageak pressures and bolas transmission.

The technique is used to quantify and characterize reflux episodes in patients with symptoms despite acid suppressive therapy, to guide further clinical care.

Can classify reflux episodes as due to gas, fluid or both, up and can indicate the content of the reflux up as acidic non-acidic.

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