Simultaneous self-monitoring comparison of a supine algorithm-equipped wrist nocturnal home blood pressure monitoring device with an upper arm device.

A nocturnal home blood pressure (BP) monitoring device that measures nighttime BP levels accurately with less sleep disturbance is needed for the 24-h management of hypertension. Here we conducted the first comparison study of simultaneous self-monitoring by both a supine position algorithm-equipped wrist nocturnal home BP monitoring device, the HEM-9601T (NightView; Omron Healthcare) with a similar upper arm device, the HEM-9700T (Omron Healthcare) in 50 hypertensive patients (mean age 68.9 ± 11.3 years). Both devices were worn on the same non-dominant arm during sleep over two nights. The patients self-measured their nighttime BP by starting nocturnal measurement mode just before going to bed. In total, 694 paired measurements were obtained during two nights (7.2 ± 1.5 measurements per night), and the mean differences (±SD) in systolic BP between the devices was 0.2 ± 10.2 mmHg (p = .563), with good agreement. In the comparison of nighttime BP indices, the difference in average SBP at 2:00, 3:00, and 4:00 AM and the average SBP of 1-h interval measurements was -0.5 ± 5.5 mmHg (p = .337), with good agreement. The HEM-9601T substantially reduced sleep disturbance compared to the upper arm-type device. The newly developed HEM-9601T (NightView) can thus accurately measure BP during sleep without reducing the wearer's sleep quality.