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Intra‐operative high‐resolution mapping of slow wave propagation in the human jejunum: Feasibility and initial results
Author(s) -
Angeli T. R.,
O'Grady G.,
Vather R.,
Bissett I. P.,
Cheng L. K.
Publication year - 2018
Publication title -
neurogastroenterology and motility
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.489
H-Index - 105
eISSN - 1365-2982
pISSN - 1350-1925
DOI - 10.1111/nmo.13310
Subject(s) - jejunum , entrainment (biomusicology) , amplitude , nerve conduction velocity , wavefront , pulsatile flow , biomedical engineering , medicine , materials science , anatomy , physics , optics , rhythm
Background Bioelectrical slow waves are a coordinating mechanism of small intestine motility, but extracellular human studies have been restricted to a limited number of sparse electrode recordings. High‐resolution ( HR ) mapping has offered substantial insights into spatiotemporal intestinal slow wave dynamics, but has been limited to animal studies to date. This study aimed to translate intra‐operative HR mapping to define pacemaking and conduction profiles in the human small intestine. Methods Immediately following laparotomy, flexible‐printed‐circuit arrays were applied around the serosa of the proximal jejunum (128‐256 electrodes; 4‐5.2 mm spacing; 28‐59 cm 2 ). Slow wave propagation patterns were mapped, and frequencies, amplitudes, downstroke widths, and velocities were calculated. Pacemaking and propagation patterns were defined. Key Results Analysis comprised nine patients with mean recording duration of 7.6 ± 2.8 minutes. Slow waves occurred at a frequency of 9.8 ± 0.4 cpm, amplitude 0.3 ± 0.04 mV, downstroke width 0.5 ± 0.1 seconds, and with faster circumferential velocity than longitudinal (10.1 ± 0.8 vs 9.0 ± 0.7 mm/s; P = .001). Focal pacemakers were identified and mapped (n = 4; mean frequency 9.9 ± 0.2 cpm). Disordered slow wave propagation was observed, including wavefront collisions, conduction blocks, and breakout and entrainment of pacemakers. Conclusions & Inferences This study introduces HR mapping of human intestinal slow waves, and provides first descriptions of intestinal pacemaker sites and velocity anisotropy. Future translation to other intestinal regions, disease states, and postsurgical dysmotility holds potential for improving the basic and clinical understanding of small intestine pathophysiology.