Abstract
Objective To establish a multi-channel impedance gastric motility detection and evaluation method for research on the spatial conduction relation of gastric motility. Methods A 4-channel measurement system of impedance gastric motility was developed. Ultrasound-assisted locating method was introduced in the system to improve the veracity and validity of electrode position. Wavelet multi-resolution analysis method was used to acquire non-interference impedance gastric motility signal and verification tests of impedance gastric motility detection on healthy volunteers were carried out. Results The wavcform amplitudes of impedance gas-trie motility signals with dominate frequency 3epm presented an increasing trend from proximal gastric corpus to pylorus. The forward and retrograde conductions of gastric motility had obvious time-phase relationship and exist-ed altemately. A conduction uncoupling would appear when forward and retrograde conductions met, then alter-nation of forward and retrograde conductions appeared and an obvious conduction delay happened. Conclusion Multi-channel impedance gastric motility measurement method investigates gastric motility according to spatial conduction and analyses amplitude, frequency changes and spatial conduction relationship of gastric motility impedance signals, It is an effective, multi-channel gastric motility evaluation method base on surface electrodes. Key words: Electrical impedance; Gastric motility; Multi-channel measurement; Spatial conduction
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