Proceedings of the 2022 IDACO/IDHOCO/IDCARS/UPRIGHT-HTM Consortium Meeting

Huang, Jian-Feng; An, De-Wei; Li, Ming-Xuan; Huang, Qi-Fang; Sheng, Chang-Sheng; Zhang, Dong-Yan; Cheng, Yi-Bang; Guo, Qian-Hui; Wang, Ying; Liu, Chu-Hao; Wang, Ji-Guang; Li, Yan

Department of Cardiovascular Medicine, Shanghai Institute of Hypertension, National Research Centre for Translational Medicine, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China

doi: 10.1097/01.mbp.0000905164.42225.9e

Objective: Blood pressure monitoring using novel wearable devices is convenient and attractive. However, the accuracy of the measurement needs validation and confirmation in different settings. The aim of this study is to compare daytime and nighttime blood pressures obtained with the Omron watch and wrist devices respectively to the routine ambulatory blood pressure monitoring (ABPM).

Methods: Patients who were referred to the outpatient clinic of Ruijin Hospital for the 24-hour ABPM from the year 2020 to 2022 were invited. After the 24-hour ABPM was performed with the Mobil-O-Graph (Germany) monitors, out-of-office BP monitoring using the two wrist devices was performed for one week. Daytime BP measurement was recommended to be manually initiated every 1 hour with the Omron watch HEM-6410T-ZM, and nighttime BP measurement automatically at 2:00, 4:00 and 4 hours after sleeping with the Omron wrist monitor HEM-9601T. All devices were worn on the same arm.

Results: In total, 165 patients were enrolled (men 84.9%, average age 43.6 years). The average daytime systolic/diastolic ABPs were 133.3±9.2 / 89.2±8.3 mmHg compared to 131.2±11.4 / 84.9±8.2 mmHg obtained with the Omron watch for 7 days. The differences between the two methods were 2.1±10.2 / 4.3±6.8 mmHg (n=158, P=0.013/<0.001). The nighttime ABPs were 118.8±9.3/76.6±8.6 mmHg compared to 112.3±12.7 / 70.4±9.5 mmHg with the Omron wrist device for 7 days. The differences between the two methods were 6.6±11.7 / 6.2±7.9 (n=146, P<0.001/<0.001). The daytime SBP obtained with the Omron watch on the first day was 131.9±12.7 mmHg, which did not differ from that with the 24-h ABPM (difference 1.4±11.6 mmHg, n=158, P=0.135). Diagnostic agreement between the Omron wrist devices and ABPM for diagnosing daytime (≥135/85 mmHg) or nighttime (≥120/70 mmHg) hypertension was fair, with the kappa (κ) statistics ranging from 0.33 to 0.36 and 0.26 to 0.29, respectively.

Conclusions: Daytime BP monitoring with the Omron watch HEM-6410T-ZM provided fairly accurate BP values as the routine ABPM, while nighttime BP might be underestimated by the wrist devices for which more research is needed.