Development of an AMR-ACB array for gastrointestinal motility studies

Area of Science:

• Biomedical Engineering
• Gastroenterology
• Sensor Technology

Background:

• Gastrointestinal motility assessment is crucial for diagnosing and managing digestive disorders.
• Current methods like manometry can be invasive and lack optimal spatiotemporal resolution.
• Developing non-invasive, high-fidelity techniques for evaluating gut function is an ongoing challenge.

Purpose of the Study:

• To present and characterize a novel Anisotropic Magnetoresistive (AMR) sensor coupled with AC biosusceptometry (ACB) for assessing gastrointestinal motility.
• To compare the performance of the AMR-ACB system against conventional manometry in vivo.
• To evaluate the system's ability to detect pharmacological modulations of gut motility.

Main Methods:

• The study involved characterizing an AMR-ACB system in bench-top experiments.
• In vivo studies were conducted, comparing AMR-ACB measurements with simultaneous manometry recordings in animal models.
• Pharmacological agents (neostigmine and hyoscine butylbromide) were administered to modulate gastrointestinal motility and assess system response.

Main Results:

• The AMR-ACB system demonstrated high temporal cross-correlation with manometry, indicating synchronized measurements.
• Contraction frequencies measured by AMR-ACB (73.9 ± 7.6 mHz) closely matched manometry (73.8 ± 7.9 mHz).
• Signal amplitudes showed comparable responses to pharmacological agents, increasing with neostigmine and decreasing with hyoscine butylbromide for both methods.

Conclusions:

• The AMR-ACB system is a viable, non-expensive, and portable tool for evaluating gastrointestinal motility.
• The system provides high-spatiotemporal resolution, offering valuable insights into gastrointestinal tract function.
• This technology presents a promising advancement for non-invasive gastrointestinal motility assessment.