title: Multi-channel wireless mapping of gastrointestinal serosal slow wave propagation.
abstract: BACKGROUND
  High-resolution (HR) extracellular mapping allows accurate profiling of normal and dysrhythmic slow wave patterns. A current limitation is that cables traverse the abdominal wall or a natural orifice, risking discomfort, dislodgement or infection. Wireless approaches offer advantages, but a multi-channel system is required, capable of recording slow waves and mapping propagation with high fidelity.
  
  
  METHODS
  A novel multi-channel (n = 7) wireless mapping system was developed and compared to a wired commercial system. Slow wave signals were recorded from the porcine gastric and intestinal serosa in vivo. Signals were simultaneously acquired using both systems, and were filtered and processed to map activation wavefronts. For validation, the frequency and amplitude of detected events were compared, together with the speed and direction of mapped wavefronts.
  
  
  RESULTS
  The wireless device achieved comparable signal quality to the reference device, and slow wave frequencies were identical. Amplitudes of the acquired gastric and intestinal slow wave signals were consistent between the devices. During normal propagation, spatiotemporal mapping remained accurate in the wireless system, however, during ectopic dysrhythmic pacemaking, the lower sampling resolution of the wireless device led to reduced accuracy in spatiotemporal mapping.
  
  
  CONCLUSIONS
  A novel multichannel wireless device is presented for mapping slow wave activity. The device achieved high quality signals, and has the potential to facilitate chronic monitoring studies and clinical translation of spatiotemporal mapping. The current implementation may be applied to detect normal patterns and dysrhythmia onset, but HR mapping with finely spaced arrays currently remains necessary to accurately define dysrhythmic patterns.
authors.affiliation: Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand.
authors.forename: N
authors.initials: N
authors.lastname: Paskaranandavadivel
authors.forename: R
authors.initials: R
authors.lastname: Wang
authors.forename: S
authors.initials: S
authors.lastname: Sathar
authors.forename: G
authors.initials: G
authors.lastname: O'Grady
authors.forename: L K
authors.initials: LK
authors.lastname: Cheng
authors.forename: A
authors.initials: A
authors.lastname: Farajidavar
mesh_terms: D000818:Animals; D004566:Electrodes; D055724:Electrophysiological Phenomena; D005260:Female; D005769:Gastrointestinal Motility / Q000502:physiology*; D013270:Stomach / Q000502:physiology*; D013552:Swine; D013686:Telemetry / Q000379:methods*; D059015:Wireless Technology
keywords: dysrhythmia; gastric electrical activity; wireless signal acquisition