Method of esophageal function testing with a standardized thixotropic swallow challenge medium
A swallow challenge medium is thixotropic for easy swallowing and to provide enough viscosity for effective challenge to peristalsis and has high ionic density for effective impedance measurements by contact with electrodes positioned in a person's esophagus or oropharynx during swallow testing. The medium also has a high surface tension so as not to adhere to or coat the electrodes or probe surfaces. These physical characteristics are stabilized and consistent enough to provide standard for esophageal and/or oropharyngeal function testing and diagnostics.
1. A method of testing peristalsis and bolus transit in a person's esophagus, comprising:
positioning a plurality of electrodes in longitudinally spaced relation to each other in a person's esophagus;
having the person swallow a thixotropic swallow challenge medium that has low shear viscosity in a range of 391,000 to 529,000 centipoises, medium shear viscosity in a range of 76,500 to 103,500 centipoises, and high shear viscosity in a range of 11,475 to 15,525 centipoises; and
measuring impedance across the electrodes as the swallow challenge medium moves through the esophagus, wherein the impedance measurements are indicative of peristalsis or bolus transit.
2. The method of claim 1 , wherein the swallow challenge medium has conductivity in a range of 4.8 to 6.6 mS/cm.
3. The method of claim 1 , wherein the swallow challenge medium has an impedance in a range of 340 to 460 ohms.
4. The method of claim 1 , wherein the swallow challenge medium has pH in a range of 3.8 to 5.2.