Transmural recordings of gastrointestinal electrical activity using a spatially-dense microelectrode array.

Area of Science:

• Gastroenterology
• Bioelectrical Engineering
• Physiology

Background:

• High-resolution serosal recordings offer insights into gastrointestinal (GI) tract bioelectrical conduction.
• Understanding electrical activity across the GI tract wall is limited.
• This study addresses the gap in knowledge regarding transmural electrical activity.

Purpose of the Study:

• To capture and quantify bioelectrical activity across the GI tract wall.
• To compare transmural slow wave characteristics with serosal slow wave features.
• To establish a novel methodology for transmural GI electrical activity measurement.

Main Methods:

• Utilized a needle-based microelectrode array for *in vivo* measurement of GI wall bioelectrical activity.
• Performed quantitative and qualitative evaluations of transmural slow wave characteristics.
• Compared transmural and serosal slow wave features, quantifying period, amplitude, and signal-to-noise ratio (SNR).

Main Results:

• Observed identical periods (4.7 ± 0.3 s) for transmural and serosal slow waves.
• Transmural layer amplitudes (0.17 ± 0.04 mV) were lower than serosal (0.31 ± 0.1 mV).
• Signal-to-noise ratios (SNR) were significantly lower in transmural (5.5 ± 1.3 dB) versus serosal (14.4 ± 1.1 dB) layers.
• Identified four distinct slow wave morphologies within the GI wall, with Types 1 and 2 being most prevalent.

Conclusions:

• Validated a novel methodology for measuring transmural slow wave activation in the GI wall.
• Findings provide a basis for investigating the origins of GI dysrhythmias and dysmotility.
• This technique can be applied to validate new therapeutics for GI health and disease.