Watch-based blood pressure monitoring detected a small but significant evening increase of 1.42 mmHg compared to morning readings, but exhibited a substantial pre-post calibration error of 4.64 mmHg.
Observational (n=896)
Does daily blood pressure monitoring using a smartwatch accurately track daily BP variance and maintain calibration stability in a general population?
Smartwatch-based blood pressure monitoring currently exhibits substantial pre-post calibration errors and may not reliably detect clinical-level BP variability for regular real-life monitoring.
Mean Difference: 1.42
Absolute Event Rate: 120.66% vs 119.24%
p-value: p=<0.001
Background: Cuffless blood pressure (BP) measurement devices integrated into smartwatches have gained prominence, yet limited studies provide the feasibility and preciseness of daily BP monitoring. Here, we evaluated the trackability of daily BP variance and the precision of the calibration process. Methods: We collected the data from 896 participants, reporting 35,592 BP values, and body composition analysis data measured by the Samsung Galaxy Watch 6 device. Participants were instructed to measure BP daily, in the morning (5 AM-9 AM) and evening (6 PM-10 PM) for 2 weeks, with initial calibration and re-calibration after the first week. Body composition data, obtained using the Galaxy Watch's bioelectrical impedance analysis sensor, was measured voluntarily during the campaign without specific time constraints. Results: < 0.05). Basal metabolic rate, skeletal muscle mass, total body water, morning systolic BP, morning pulse pressure, and morning heart rate were significantly associated with higher difference in morning-evening BP. The calibration stability was assessed by the difference in average BP before and after calibration, showing a substantial pre-post calibration BP difference by 4.64 ± 4.73 mmHg of systolic BP and 3.66 ± 3.62 mmHg of diastolic BP. Conclusions: In conclusion, watch-based devices may not detect clinical-level BP variability, and substantial extent of pre-post calibration error has to be solved for their utility in regular real-life BP monitoring.
Lee et al. (Wed,) conducted a observational in General population (including 20.9% hypertensive) (n=896). Samsung Galaxy Watch 6 (cuffless blood pressure monitoring) vs. Morning measurements was evaluated on Difference between evening and morning systolic blood pressure (MD 1.42, p=<0.001). Watch-based blood pressure monitoring detected a small but significant evening increase of 1.42 mmHg compared to morning readings, but exhibited a substantial pre-post calibration error of 4.64 mmHg.