This study evaluated a novel, audio-based digital monitoring system for detecting retching and vomiting (expulsion) events in a noninterventional, longitudinal study in 25 participants with gastroparesis (GP). Participants used an audio-based system comprising an iOS device (iPhone) and Watch in their homes for 14 days. Retching and expulsion events were quantified using human-annotated counts from audio recordings and daily electronic patient-reported outcome (ePRO) counts.
Device compliance was calculated as recorded h divided by the total h (24 × 14). Compliance was high: 83.4% for the iPhone and 69.4% for the Watch. Event timing analyses from the audio devices revealed elevated retching and expulsion activity in the morning, with symptoms persisting during nighttime h.
Watch and iOS event counts showed strong correlation (r > 0.85), though device agreement with ePRO counts was lower (r
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