![]() 900) digital watch, which employs an individualized, two-point calibration method. Objective: This study explored the PAT method of BP estimation in a commercial device where it first began, the Casio BP-100 (Model No. Most devices rely, at least in part, on the relationship between pulse arrival time (PAT) and BP, a theoretical fundamental relationship that was first commercially exploited in 1993 with the release of the Casio BP-100 digital watch. If the utility of beat-by-beat BP estimation is to be utilized, limitations of this method need to be addressed.Ībstract = "Background: The use of wearable cuffless blood pressure (BP) devices is becoming commercially prevalent with little published validation information. The watch, on average across a cohort, provided some information on BP directional change but was uncorrelated with cuff-based BP measurement. Conclusions: Despite being an industry first, the Casio BP-100 watch employed a method that gives a great chance of accuracy: a two point, individualized calibration method – more detailed than calibration methods in more modern devices. However, on average the watch was able to provide correct directional changes in SBP but not DBP with exercise. ![]() The devices showed poor correlation for both systolic BP (SBP) (R=0.36, p=0.13) and diastolic BP (DBP) (R=0.044, p=0.37). Results: Due to bidirectional scatter of BP estimation by the BP-100 device, there was no significant difference between the reference device and the BP-100. Methods: Twenty participants (11 female, 9 male) had BP measured using both devices at rest, during a 5-minute isometric hand- grip exercise and at 1-minute post-exercise. ![]() Device accuracy was determined by comparison to a conventional cuff-based BP device measurements. ![]() Background: The use of wearable cuffless blood pressure (BP) devices is becoming commercially prevalent with little published validation information. ![]()
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