Multichannel electrogastrography under a magnifying glass – an in‐depth study on reproducibility of fed state electrogastrograms

We checked on reproducibility of parameters of a multichannel electrogastrogram in adults after intake of typical, applied in electrogastrography, test meals. Recordings of multichannel electrogastrograms were accomplished in four blocks comprising 18 subjects (nine healthy volunteers and nine patients with functional GI disorders) each. Every subject had two examinations taken 1‐2 days apart, and a third one was accomplished at least 2 weeks before or after the two other sessions. The registration involved a 30‐min fasted and a 2‐h postprandial period after one of the meal stimuli tested within a given block: 400 mL water, 400 g yoghurt (378 kcal), a scrambled eggs sandwich (370 kcal), a pancake (355 kcal). From among the parameters reflecting the propagation of the gastric slow waves, the average percentage of slow wave coupling (APSWC) exhibited a good (coefficient of variation for paired examinations CVp ≤ 10%) to moderate (10