Objective detection of wheeze at home by parents through a digital device: usage patterns and relationship with SABA administration

Wheezing is an important indicator of exacerbated respiratory symptoms in early childhood and must be monitored to regulate pharmacological therapy. However, parents' subjective perception of wheezing in their children is not always precise. We investigated the objective identification of children's wheezing by parents using a digital wheeze detector (WheezeScan , OMRON Healthcare Co. Ltd), its longitudinal usage patterns, and its relationship with SABA administration. We conducted a secondary nested analysis of data from the intervention arm of a multi-center randomized controlled trial completed in 2021-2022 in Berlin (Germany), London (United Kingdom), and Istanbul (Turkey). Children aged 4 to 84 months with doctor's diagnosed wheezing (GINA step 1 or 2) were included. Using an electronic diary (Wheeze-Monitor , TPS), parents monitored and recorded for 120 days at home the presence or absence of their child's wheezing, detected both, with WheezeScan ("objective" wheezing), and subjective ("perceived" wheezing). Parents also recorded the child's symptoms, medication intake, and family quality of life. Questionnaires regarding symptom control, quality of life, and parental self-efficacy were answered at baseline and after 90 and 120 days. Eighty-one/87 families completed the intervention arm of the study. WheezeScan was on average used 0.7 (SD 0.6) times a day, with each patient reporting a positive, negative, or "error" outcome on average in 57%, 39%, and 5% of measurements, respectively. The use of WheezeScan declined slightly during the first 90 days of monitoring and steeply thereafter. Repeated usage of WheezeScan in the same day was more frequent after a "wheeze" (HR 1.5, 95% CI 1.37-1.65, p