Table 1.

Definitions of spatial gastric slow wave dysrhythmias.

Dysrhythmia	Definition
Ectopic activation	A ectopic activation was defined as an aberrant initiation of slow wave from a source distal to the natural pacemaker (proximal greater curvature) (Lammers et al.,2008; O'Grady et al., 2012)
Conduction block	Either a partial or complete block to propagation of normal slow waves (O'Grady et al., 2011; Angeli et al., 2015).
Rotor	A rotating wavefront propagating repeatedly in a single-direction around a ‘core’ region, as a re-entrant circuit (Lammers et al., 2008).,(Angeli et al., 2013).
Retrograde propagation	A slow wave event propagating in the oral direction.
Collision and merge	Collision: meeting and termination of two independent wavefronts propagating in opposite directions, e.g., retrograde and antegrade or circumferentially. Merge: joining of two independent wavefronts propagating in the same direction.