Spatial response of jejunal pacing defined by a novel high-resolution multielectrode array.

Area of Science:

• Gastroenterology
• Biomedical Engineering
• Neurogastroenterology

Background:

• Gastric pacing shows promise for functional motility disorders, but small intestine pacing is underdeveloped.
• Current techniques lack high-resolution mapping capabilities for small intestine bioelectrical activity.

Purpose of the Study:

• To present the first high-resolution framework for simultaneous pacing and response mapping of the small intestine.
• To evaluate pacing parameters and efficacy in vivo for potential therapeutic applications.

Main Methods:

• Developed a novel surface-contact electrode array for simultaneous pacing and mapping.
• Applied the array in vivo to the proximal jejunum of pigs, evaluating energy levels and electrode orientations.
• Analyzed spatiotemporal characteristics of entrained slow waves and conducted histological analysis for tissue damage.

Main Results:

• Successfully achieved pacemaker propagation patterns at both low (2 mA, 50 ms) and high (4 mA, 100 ms) energy levels.
• High energy levels significantly improved spatial entrainment (P = 0.014).
• Circumferential and antegrade pacing directions achieved over 70% success in spatial entrainment without tissue damage.

Conclusions:

• Defined the in vivo spatial response of small intestine pacing, identifying effective parameters for jejunal slow-wave entrainment.
• This framework enables future translation of intestinal pacing to restore disordered slow-wave activity in motility disorders.